Jvm 1.4,1.5 default memory usage in Ram in different operating systems

Hi ,
Can anyone help me with the default memory occupied by Jvm in different operating systems ?
I have practically seen that jdk1.4,jdk1.5,jdk1.3 has around 64 Mb as the
default size on 32 bit machines .
I am in need of the similar data for jvms on Solaris,Unix and Linux machines . Also much curious to know about the default memory occupied on 64 bit machines. It would be really great if the statistical data is present in any link .
Thanks and Regards
Suman

Default Heap sizes on 64 bit JVM are by default 30% bigger then the 32bit version to accomodate the extra memory used by 64 bit object pointers instead of 32 bit.
This link plus documents close to it answers most questions.
http://java.sun.com/docs/hotspot/gc5.0/gc_tuning_5.html#1.1.%20Types%20of%20Collectors%7Coutline

Similar Messages

Memory Allocation under Different Operating Systems

Hello
What is the exact behavior of java -Xmsn -Xmxn under different operating systems?
I am running my application on windows and linux.
In linux i specify java -Xms512M -Xmx512M and it seems to only initially allocate 22M (i have enough space on the machine).
I also do the same on windows and it seems to allocate 97M or so.
Does any understand what exactly happens when you allocate min and max memory on different operating systems? Are these options fully functioning?
Thanks

AS far as I know -Xms is the minimum size of the heap, and when the VM will be created it'll bild a heap of this size.
Ussually on servers this parameters are fixed to the same size, to the limit of memory that the machine has. This has one advantage: everytime the heap increases your application may be stopped because of the need of ollocate new memory. If you make the initial size of the heap to bhe equal to the minimum this never will occur, despite the starupo of the application will be slower due to the need of allocating big amounts of Ram.
About what you have seen, I'm afraid you are doing something wrong. This parameter works, and if you stated that -Xms128m, the initial heap of your aplication will be this (I've just checked it under Windows 2000).
Abraham.

Porting JVM to different operating systems

Hi,
I am developing my own operating system (called Muade OS) and I am interested in porting Java to it. I have studied java_md.c, and I know how to rewrite it for Muade OS, but I have absolutely no idea how to port JVM.
Thanks in advance!

Hi,
:. I think the better way for you is creating your own Virtual Machine based on Java Virtual Machine Specification (see java.sun.com/docs/books). Not easy task, but a nice feature for your new operating system.
Regards.

Relation between JVM and different operating system

What is different between operating system and jvm ?
how JVM differ from operating system?

What is different between operating system and jvm ?
how JVM differ from operating system?That's a really strange question to ask,
because surely you see the difference
when you load them.
For example, most machines run Windows.
And you then tell Windows to load JVM.
And you then tell JVM to load a Java program.
It's like this:
Hardware -> OS -> JVM -> Java programs
You can't run any Java programs without first loading a JVM.
And currently, there are no (popular/successful) JVM that can run without an OS.

Mail.app memory leak. RAM use increases until system is no longer usable

I am having this problem since a week ago more less.
Mail keeps increasing the memory use from a starting 100 Megas. Increasing something like 100 megas each 10 minutes, until the whole system is unresponsive.
Any ideas?
Thanks!
PD: I have 3 IMAP accounts and 1 POP. In total 3348 messages. Running 10.5.4

Thank for the fast reply!
Indeed it happened to me. Whenever I dropped a file to the icon it would just hang up the computer. Then I removed my custom plugins (3 columns plugin, and Encryption plugin , I thing). And it worked well. Or at least I could drop files to the Mail Dock icon.
My impression is that it might be related with IMAP and Gmail. I have 3 Gmail accounts. One of them is my primary email account, it has many many mail. The "all Mail" folder is a big one and probably Mail is trying to catch everything. It does so slowly in the background, creating the problem. May be. Just in case I selected the option not to download attachment in mails.
Other suspect is the iGTD program I have been using. It syncs with Calendar and the ToDo folder in Mail. But the problem is still there even if iGTD is not working.
I remember reading something about email with attachment that had numbers on the title, or something like that. It would create a similar problem but I can´t find it now.
I have tried to control the output from "lsof | grep Mail" and "fs_usage -w -f filesys Mail" but I can´t find anything suspicius (not that I am an expert on that, though)
THANKS a lot for the help.

Numbers of Oracle DB usage on different operating systems

Hi all,
I am looking for numbers that breakdown in what proportion Oracle DB is used in different operating systems, specifically the percentage of use in each group of operating systems.
- Windows
- OpenVMS
- Linux
- Unixes.
- Others
Could someone provide some numbers or a link to where I could get the information?
I am especially interested in windows and OpenVMS...
Best wishes to all
Andre

Hi Andy,
I'm seeing lot of companies prefer Unix(Solaris, HP, Linux) as a production. My experience working with 3 big clients like Cingular (USA), Orange (UK) & SKY(UK) they have many solaris oracle and few HP oracle (Orange).
Cheers,
Kamalesh JK

Memory leak in jvm? totalMemory differs real memory usage

I working on a server application under linux with java 1.4.1_02.
The problem is that the OS reports after approx. 2 days a memory usage of about 200 MB while the JVM's totalMemory method says, that only about 20 MB are allocated and more than 10 MB of these 20 MB are free. Calling System.gc() doesn't help.
Is there a memory leak in the JVM itself ?
Is there a bugfix or workaround for preventing out of memory ?

hi, here is some of the messages from our tomcat log. Please let us know if you see something here.
thanks
wh
14:04 Started Tomcat0.000: [GC 23352K->3056K(259264K), 0.0425550 secs]
6.396: [GC 26416K->3837K(259264K), 0.0428260 secs]
67.830: [GC 27197K->7675K(259264K), 0.0526750 secs]
14:11 Started OpenSTA load test (Tomcat 103M/103M SIZE/RSIZE)417.805: [Full GC 23900K->10468K(259264K), 0.1470690 secs]
464.368: [Full GC 29592K->12380K(259264K), 0.1984410 secs]
474.295: [GC 35740K->16076K(259264K), 0.0362230 secs]
482.470: [Full GC 32672K->16120K(259264K), 0.1574280 secs]
497.299: [Full GC 32266K->15347K(259264K), 0.1993480 secs]
513.132: [GC 38707K->15644K(259264K), 0.0067610 secs]
513.552: [Full GC 21105K->15833K(259264K), 0.1484350 secs]
524.393: [Full GC 31980K->15975K(259264K), 0.1507760 secs]
535.314: [Full GC 36832K->16164K(259264K), 0.1561530 secs]
544.704: [GC 39524K->16360K(259264K), 0.0035200 secs]
544.724: [Full GC 17439K->15435K(259264K), 0.1654420 secs]
550.837: [GC 38790K->15669K(259264K), 0.0031210 secs]
550.961: [Full GC 20198K->15612K(259264K), 0.1458520 secs]
561.816: [Full GC 36712K->15768K(259264K), 0.1535080 secs]
567.997: [Full GC 38928K->15944K(259264K), 0.1586890 secs]
572.313: [Full GC 29129K->15618K(259264K), 0.1764170 secs]
581.769: [Full GC 36749K->15768K(259264K), 0.1538980 secs]
588.514: [GC 39123K->16114K(259264K), 0.0042700 secs]
588.573: [Full GC 20576K->15878K(259264K), 0.1476950 secs]
592.833: [Full GC 34359K->16027K(259264K), 0.1563230 secs]
594.394: [GC 39387K->16189K(259264K), 0.0030660 secs]
596.453: [Full GC 30677K->15678K(259264K), 0.1698180 secs]
603.878: [GC 39038K->15839K(259264K), 0.0043830 secs]
610.088: [Full GC 32709K->15843K(259264K), 0.1554470 secs]
613.281: [Full GC 25096K->15932K(259264K), 0.1500100 secs]
618.982: [Full GC 35727K->16060K(259264K), 0.1558180 secs]
625.228: [Full GC 39090K->15677K(259264K), 0.1778470 secs]
638.611: [GC 39037K->15885K(259264K), 0.0034330 secs]
639.430: [Full GC 22116K->15866K(259264K), 0.1508080 secs]
646.904: [Full GC 26171K->16062K(259264K), 0.1532020 secs]
652.457: [Full GC 25748K->16156K(259264K), 0.1512670 secs]
658.609: [GC 39516K->16367K(259264K), 0.0032440 secs]
660.209: [Full GC 21359K->15677K(259264K), 0.1657590 secs]
664.911: [Full GC 34660K->15809K(259264K), 0.1562110 secs]
670.953: [Full GC 33108K->15937K(259264K), 0.1571950 secs]
673.849: [Full GC 29438K->16016K(259264K), 0.1531250 secs]
680.074: [GC 39376K->16523K(259264K), 0.0060770 secs]
680.279: [Full GC 26022K->15968K(259264K), 0.1805950 secs]
686.274: [Full GC 39141K->16092K(259264K), 0.1616190 secs]
688.844: [Full GC 36586K->16180K(259264K), 0.1567480 secs]
693.700: [Full GC 35574K->16344K(259264K), 0.1574960 secs]
700.598: [GC 39704K->16637K(259264K), 0.0035300 secs]
700.624: [Full GC 18174K->15872K(259264K), 0.1651170 secs]
703.509: [Full GC 34099K->16082K(259264K), 0.1573090 secs]
707.642: [GC 39442K->16171K(259264K), 0.0025780 secs]
709.815: [Full GC 28634K->16206K(259264K), 0.1534170 secs]
716.272: [Full GC 36047K->16381K(259264K), 0.1587900 secs]
723.495: [Full GC 39059K->16219K(259264K), 0.1683900 secs]
728.392: [GC 39577K->16618K(259264K), 0.0040680 secs]
728.415: [Full GC 18013K->16400K(259264K), 0.1536650 secs]
731.039: [Full GC 34082K->16531K(259264K), 0.1571980 secs]
737.472: [Full GC 32417K->16713K(259264K), 0.1577520 secs]
742.717: [Full GC 37469K->16111K(259264K), 0.1606780 secs]
744.274: [GC 39471K->16290K(259264K), 0.0033230 secs]
744.613: [Full GC 21102K->16265K(259264K), 0.1536350 secs]
748.395: [GC 39621K->16436K(259264K), 0.0031140 secs]
748.677: [Full GC 25242K->16359K(259264K), 0.1576130 secs]
750.854: [Full GC 31336K->16451K(259264K), 0.1585730 secs]
756.051: [Full GC 36466K->16119K(259264K), 0.1612460 secs]
759.115: [GC 39479K->16346K(259264K), 0.0028810 secs]
760.093: [Full GC 21902K->16228K(259264K), 0.1520320 secs]
763.760: [GC 39582K->16700K(259264K), 0.0059930 secs]
764.034: [Full GC 22526K->16387K(259264K), 0.1544760 secs]
768.679: [Full GC 32133K->16544K(259264K), 0.1591930 secs]
771.644: [Full GC 31230K->16325K(259264K), 0.1612140 secs]
776.770: [Full GC 38785K->16445K(259264K), 0.1620900 secs]
780.396: [Full GC 37938K->16896K(259264K), 0.1673300 secs]
782.776: [Full GC 30184K->17037K(259264K), 0.1590650 secs]
786.573: [GC 40397K->17228K(259264K), 0.0034880 secs]
786.731: [Full GC 19211K->16266K(259264K), 0.1549430 secs]
789.000: [GC 39619K->16361K(259264K), 0.0026020 secs]
789.269: [Full GC 19125K->16399K(259264K), 0.1513090 secs]
792.386: [Full GC 36010K->16508K(259264K), 0.1637400 secs]
795.102: [GC 39868K->16833K(259264K), 0.0040440 secs]
795.207: [Full GC 21389K->16739K(259264K), 0.1533440 secs]
799.324: [Full GC 23240K->16280K(259264K), 0.1577710 secs]
802.196: [GC 39639K->16518K(259264K), 0.0033770 secs]
802.399: [Full GC 22872K->16698K(259264K), 0.1572730 secs]
807.161: [GC 40058K->16776K(259264K), 0.0027580 secs]
809.900: [Full GC 36185K->16876K(259264K), 0.1607120 secs]
811.791: [Full GC 30282K->16978K(259264K), 0.1593370 secs]
813.563: [GC 40337K->17376K(259264K), 0.0064020 secs]
813.804: [Full GC 29057K->16982K(259264K), 0.1816130 secs]
815.297: [GC 40336K->17338K(259264K), 0.0039630 secs]
815.310: [Full GC 17806K->17082K(259264K), 0.1522910 secs]
819.516: [GC 40438K->17223K(259264K), 0.0028420 secs]
821.285: [Full GC 26923K->17272K(259264K), 0.1588350 secs]
823.559: [GC 40632K->17448K(259264K), 0.0031100 secs]
824.265: [Full GC 21492K->17462K(259264K), 0.1550870 secs]
825.397: [GC 40822K->17655K(259264K), 0.0031120 secs]
825.486: [Full GC 18871K->16337K(259264K), 0.1562730 secs]
829.469: [Full GC 38369K->16447K(259264K), 0.1650720 secs]
831.816: [GC 39807K->16601K(259264K), 0.0026710 secs]
831.827: [Full GC 17119K->16512K(259264K), 0.1522890 secs]
835.329: [GC 39872K->17080K(259264K), 0.0053700 secs]
835.465: [Full GC 23458K->16733K(259264K), 0.1581070 secs]
837.668: [GC 40093K->16935K(259264K), 0.0031290 secs]
838.251: [Full GC 20039K->16495K(259264K), 0.1564500 secs]
841.767: [Full GC 25895K->16613K(259264K), 0.1577470 secs]
844.476: [Full GC 35311K->16695K(259264K), 0.1628390 secs]
848.103: [GC 40044K->17069K(259264K), 0.0032710 secs]
848.628: [Full GC 22870K->16916K(259264K), 0.1580780 secs]
854.887: [Full GC 31905K->16323K(259264K), 0.1653390 secs]
857.228: [Full GC 36492K->16530K(259264K), 0.1634600 secs]
858.956: [GC 39890K->16815K(259264K), 0.0036330 secs]
862.023: [Full GC 21092K->16631K(259264K), 0.1564650 secs]
863.249: [Full GC 26164K->16781K(259264K), 0.1562600 secs]
865.711: [GC 40141K->17043K(259264K), 0.0031530 secs]
865.729: [Full GC 18180K->16457K(259264K), 0.1577410 secs]
869.627: [GC 39817K->16729K(259264K), 0.0033990 secs]
870.098: [Full GC 24966K->16659K(259264K), 0.1562460 secs]
872.350: [Full GC 31145K->16718K(259264K), 0.1604970 secs]
876.105: [Full GC 39279K->16941K(259264K), 0.1668260 secs]
880.207: [GC 40299K->17205K(259264K), 0.0034920 secs]
880.251: [Full GC 20652K->16517K(259264K), 0.1571090 secs]
883.114: [Full GC 37902K->16737K(259264K), 0.1646110 secs]
884.628: [Full GC 24661K->16849K(259264K), 0.1560830 secs]
888.022: [GC 40203K->17459K(259264K), 0.0051950 secs]
889.142: [Full GC 22380K->17051K(259264K), 0.1583020 secs]
891.554: [GC 40411K->17208K(259264K), 0.0027960 secs]
891.582: [Full GC 18063K->16781K(259264K), 0.1585470 secs]
892.405: [Full GC 29120K->17053K(259264K), 0.1622140 secs]
894.017: [GC 40406K->17464K(259264K), 0.0045690 secs]
895.447: [Full GC 31179K->17223K(259264K), 0.1628010 secs]
897.067: [Full GC 38729K->17329K(259264K), 0.1647360 secs]
900.396: [GC 40689K->17720K(259264K), 0.0044380 secs]
900.441: [Full GC 20648K->16903K(259264K), 0.1598090 secs]
902.678: [Full GC 35946K->17128K(259264K), 0.1663350 secs]
905.853: [GC 40488K->17532K(259264K), 0.0064380 secs]
905.891: [Full GC 19672K->17499K(259264K), 0.1621960 secs]
907.750: [GC 40847K->17670K(259264K), 0.0030520 secs]
908.460: [Full GC 20024K->17620K(259264K), 0.1565920 secs]
910.624: [GC 40980K->17765K(259264K), 0.0030090 secs]
910.671: [Full GC 18684K->16921K(259264K), 0.1605090 secs]
912.509: [Full GC 29066K->17017K(259264K), 0.1614450 secs]
913.757: [GC 40377K->17483K(259264K), 0.0047620 secs]
914.763: [Full GC 25902K->17141K(259264K), 0.1608170 secs]
917.689: [GC 40501K->17647K(259264K), 0.0049530 secs]
918.806: [Full GC 28871K->17294K(259264K), 0.1601960 secs]
921.558: [GC 40654K->17457K(259264K), 0.0029970 secs]
922.333: [Full GC 30464K->16925K(259264K), 0.1662820 secs]
923.373: [GC 40285K->17159K(259264K), 0.0042550 secs]
923.555: [Full GC 24496K->17082K(259264K), 0.1599500 secs]
927.044: [Full GC 37046K->17226K(259264K), 0.1683760 secs]
929.061: [GC 40586K->17346K(259264K), 0.0026490 secs]
929.162: [Full GC 21815K->17310K(259264K), 0.1590250 secs]
931.978: [GC 40670K->17413K(259264K), 0.0024780 secs]
932.513: [Full GC 23342K->16981K(259264K), 0.1626270 secs]
935.043: [GC 40341K->17151K(259264K), 0.0028210 secs]
935.520: [Full GC 29674K->17213K(259264K), 0.1660230 secs]
937.492: [GC 40573K->17558K(259264K), 0.0039620 secs]
937.670: [Full GC 23593K->17320K(259264K), 0.1597560 secs]
938.607: [GC 40680K->17648K(259264K), 0.0045610 secs]
939.678: [Full GC 33877K->17515K(259264K), 0.1648540 secs]
942.806: [GC 40869K->18021K(259264K), 0.0051340 secs]
944.254: [Full GC 35743K->17147K(259264K), 0.1719980 secs]
945.155: [Full GC 36250K->17530K(259264K), 0.1705550 secs]
946.222: [Full GC 34120K->17623K(259264K), 0.1649620 secs]
949.645: [Full GC 30572K->17807K(259264K), 0.1649170 secs]
952.442: [GC 41163K->17964K(259264K), 0.0030280 secs]
952.566: [Full GC 20289K->16895K(259264K), 0.1610340 secs]
954.853: [Full GC 28279K->17090K(259264K), 0.1638610 secs]
957.884: [GC 40445K->17584K(259264K), 0.0047550 secs]
958.667: [Full GC 32363K->17427K(259264K), 0.1661990 secs]
959.881: [Full GC 33152K->17499K(259264K), 0.1664660 secs]
964.265: [Full GC 37131K->17078K(259264K), 0.1695560 secs]
967.544: [Full GC 39971K->17286K(259264K), 0.1698470 secs]
972.467: [GC 40645K->17716K(259264K), 0.0058330 secs]
972.573: [Full GC 19899K->17688K(259264K), 0.1596110 secs]
973.323: [GC 41048K->18078K(259264K), 0.0039180 secs]
973.767: [Full GC 30629K->18056K(259264K), 0.1642740 secs]
975.978: [Full GC 32502K->16772K(259264K), 0.1692030 secs]
977.636: [GC 40132K->17237K(259264K), 0.0055500 secs]
978.935: [Full GC 25669K->16985K(259264K), 0.1628640 secs]
980.311: [Full GC 36664K->17060K(259264K), 0.1661300 secs]
984.254: [GC 40420K->17283K(259264K), 0.0035880 secs]
984.947: [Full GC 28397K->17339K(259264K), 0.1645970 secs]
988.111: [Full GC 30208K->16821K(259264K), 0.1669820 secs]
991.456: [Full GC 24124K->16941K(259264K), 0.1607770 secs]
994.575: [GC 40301K->17145K(259264K), 0.0035460 secs]
995.050: [Full GC 26065K->17242K(259264K), 0.1658660 secs]
996.625: [Full GC 37922K->17434K(259264K), 0.1697800 secs]
999.246: [Full GC 31259K->17049K(259264K), 0.1676220 secs]
1001.492: [GC 40408K->17779K(259264K), 0.0078300 secs]
1001.859: [Full GC 34893K->17307K(259264K), 0.1669200 secs]
1004.393: [GC 40666K->17525K(259264K), 0.0030640 secs]
1004.425: [Full GC 20060K->17436K(259264K), 0.1593370 secs]
1007.645: [GC 40794K->17669K(259264K), 0.0030540 secs]
1008.124: [Full GC 30847K->17795K(259264K), 0.1688060 secs]
1009.680: [Full GC 27073K->17588K(259264K), 0.1798900 secs]
1011.538: [Full GC 30414K->17677K(259264K), 0.1661910 secs]
1016.696: [GC 41037K->17878K(259264K), 0.0043140 secs]
1017.675: [GC 41238K->18305K(259264K), 0.0076230 secs]
1017.697: [Full GC 18965K->17980K(259264K), 0.1633270 secs]
1018.701: [Full GC 40089K->18034K(259264K), 0.1699260 secs]
1022.387: [Full GC 40085K->17215K(259264K), 0.1718460 secs]
1024.329: [GC 40575K->17390K(259264K), 0.0033200 secs]
1025.327: [Full GC 32127K->17405K(259264K), 0.1646980 secs]
1027.948: [GC 40765K->18028K(259264K), 0.0072570 secs]
1028.257: [Full GC 33726K->17576K(259264K), 0.1646440 secs]
1029.759: [Full GC 35673K->17688K(259264K), 0.1722710 secs]
1032.229: [Full GC 29552K->17224K(259264K), 0.1670930 secs]
1036.764: [GC 40584K->17488K(259264K), 0.0044870 secs]
1037.789: [Full GC 23532K->17375K(259264K), 0.1604060 secs]
1040.193: [Full GC 40682K->17543K(259264K), 0.1722250 secs]
1041.362: [GC 40902K->17948K(259264K), 0.0044240 secs]
1042.386: [Full GC 29926K->17651K(259264K), 0.1651240 secs]
1046.173: [GC 41011K->17786K(259264K), 0.0030940 secs]
1046.186: [Full GC 18169K->17442K(259264K), 0.1657440 secs]
1048.882: [GC 40802K->17670K(259264K), 0.0032420 secs]
1049.728: [Full GC 26921K->17623K(259264K), 0.1666840 secs]
1050.667: [Full GC 27281K->17714K(259264K), 0.1655080 secs]
1053.205: [Full GC 39795K->17784K(259264K), 0.1699730 secs]
1055.242: [Full GC 37892K->17524K(259264K), 0.1736060 secs]
1058.278: [GC 40877K->17783K(259264K), 0.0032240 secs]
1058.934: [Full GC 24636K->17670K(259264K), 0.1629560 secs]
1061.572: [Full GC 32462K->17738K(259264K), 0.1658050 secs]
1064.860: [GC 41090K->18049K(259264K), 0.0031520 secs]
1064.873: [Full GC 18402K->17913K(259264K), 0.1598100 secs]
1068.969: [GC 41272K->18129K(259264K), 0.0030650 secs]
1069.415: [Full GC 25714K->17421K(259264K), 0.1689390 secs]
1070.981: [Full GC 40072K->17529K(259264K), 0.1719780 secs]
1072.694: [Full GC 40298K->17684K(259264K), 0.1755570 secs]
1074.349: [Full GC 29692K->17760K(259264K), 0.1646700 secs]
1079.137: [GC 41120K->18001K(259264K), 0.0032570 secs]
1079.901: [Full GC 29267K->17912K(259264K), 0.1952200 secs]
1081.705: [GC 41272K->18459K(259264K), 0.0059700 secs]
1082.812: [Full GC 28652K->18115K(259264K), 0.1686030 secs]
1084.535: [GC 41475K->18286K(259264K), 0.0029690 secs]
1085.759: [Full GC 22825K->18304K(259264K), 0.1620300 secs]
1088.874: [GC 41664K->18557K(259264K), 0.0032180 secs]
1090.304: [Full GC 23507K->18428K(259264K), 0.1613190 secs]
1092.560: [GC 41787K->18731K(259264K), 0.0037290 secs]
1092.568: [Full GC 18918K->17280K(259264K), 0.1863890 secs]
1094.698: [Full GC 40048K->17487K(259264K), 0.1717440 secs]
1097.608: [GC 40847K->17639K(259264K), 0.0029460 secs]
1097.770: [Full GC 21453K->17546K(259264K), 0.1593820 secs]
1101.222: [Full GC 34584K->17699K(259264K), 0.1714350 secs]
1103.842: [Full GC 29518K->17398K(259264K), 0.1673060 secs]
1105.429: [Full GC 36543K->17480K(259264K), 0.1687430 secs]
1107.633: [GC 40839K->17863K(259264K), 0.0037960 secs]
1109.418: [Full GC 38489K->17844K(259264K), 0.1714760 secs]
1110.644: [GC 41201K->18176K(259264K), 0.0037780 secs]
1110.708: [Full GC 22032K->18031K(259264K), 0.1629450 secs]
1112.769: [Full GC 33242K->17641K(259264K), 0.1746310 secs]
1115.871: [GC 41001K->17913K(259264K), 0.0042400 secs]
1115.936: [Full GC 18849K->17868K(259264K), 0.1649840 secs]
1116.903: [GC 41228K->18158K(259264K), 0.0038590 secs]
1117.142: [Full GC 23635K->18147K(259264K), 0.1661090 secs]
1119.657: [Full GC 33873K->18237K(259264K), 0.1687550 secs]
1122.138: [GC 41597K->18843K(259264K), 0.0057360 secs]
1122.460: [Full GC 30191K->17352K(259264K), 0.1718040 secs]
1124.176: [GC 40711K->17534K(259264K), 0.0032200 secs]
1124.188: [Full GC 18088K->17408K(259264K), 0.1585710 secs]
1126.471: [GC 40768K->17610K(259264K), 0.0030090 secs]
1126.621: [Full GC 23207K->17585K(259264K), 0.1639700 secs]
1130.601: [GC 40945K->18032K(259264K), 0.0057690 secs]
1130.987: [Full GC 33251K->17715K(259264K), 0.1698070 secs]
1132.400: [GC 41075K->18200K(259264K), 0.0048990 secs]
1133.852: [Full GC 22412K->17396K(259264K), 0.1678410 secs]
1134.988: [GC 40756K->17811K(259264K), 0.0047240 secs]
1135.108: [Full GC 22610K->17538K(259264K), 0.1632820 secs]
1138.140: [Full GC 35484K->17677K(259264K), 0.1697280 secs]
1140.949: [GC 41037K->18028K(259264K), 0.0039610 secs]
1142.579: [Full GC 26182K->17886K(259264K), 0.1663820 secs]
1145.332: [Full GC 38186K->17413K(259264K), 0.1775910 secs]
1147.998: [Full GC 31086K->17542K(259264K), 0.1694310 secs]
1150.183: [GC 40902K->17680K(259264K), 0.0028430 secs]
1151.988: [Full GC 23320K->17714K(259264K), 0.1662670 secs]
1153.556: [GC 41074K->18019K(259264K), 0.0033240 secs]
1153.694: [Full GC 22297K->17819K(259264K), 0.1636210 secs]
1156.910: [Full GC 32491K->17555K(259264K), 0.1708090 secs]
1159.295: [GC 40915K->17925K(259264K), 0.0041940 secs]
1159.584: [Full GC 27356K->17749K(259264K), 0.1684860 secs]
1162.179: [Full GC 40840K->17842K(259264K), 0.1709320 secs]
1165.462: [Full GC 40836K->17998K(259264K), 0.1745900 secs]
1169.213: [Full GC 38228K->17387K(259264K), 0.1773150 secs]
1173.839: [Full GC 38730K->17553K(259264K), 0.1721990 secs]
1176.118: [Full GC 28517K->17724K(259264K), 0.1694920 secs]
1178.427: [GC 41084K->18236K(259264K), 0.0056840 secs]
1178.476: [Full GC 21916K->17907K(259264K), 0.1636330 secs]
1180.035: [Full GC 28804K->17629K(259264K), 0.1706580 secs]
1183.111: [GC 40989K->17821K(259264K), 0.0039230 secs]
1183.470: [Full GC 27647K->17770K(259264K), 0.1642930 secs]
1186.098: [Full GC 34782K->18020K(259264K), 0.1711540 secs]
1189.374: [GC 41380K->18148K(259264K), 0.0030680 secs]
1189.773: [Full GC 19108K->18108K(259264K), 0.1620400 secs]
1193.545: [GC 41468K->18264K(259264K), 0.0030810 secs]
1195.049: [Full GC 33109K->17520K(259264K), 0.1722670 secs]
1197.419: [Full GC 34615K->17775K(259264K), 0.1743520 secs]
1198.468: [Full GC 27126K->17819K(259264K), 0.1658660 secs]
1201.775: [GC 41179K->18064K(259264K), 0.0032670 secs]
1202.434: [Full GC 34303K->18285K(259264K), 0.1741190 secs]
1204.504: [GC 41645K->18591K(259264K), 0.0040820 secs]
1205.473: [Full GC 28617K->17816K(259264K), 0.1725460 secs]
1206.615: [Full GC 23644K->17914K(259264K), 0.1654130 secs]
1208.603: [GC 41274K->18294K(259264K), 0.0047020 secs]
1208.659: [Full GC 21617K->18046K(259264K), 0.1671710 secs]
1210.184: [Full GC 38308K->18107K(259264K), 0.1723240 secs]
1212.135: [Full GC 26647K->17955K(259264K), 0.1731150 secs]
1216.077: [GC 41314K->18170K(259264K), 0.0041080 secs]
1216.475: [Full GC 28069K->18058K(259264K), 0.1722190 secs]
1218.160: [GC 41418K->18256K(259264K), 0.0029660 secs]
1218.196: [Full GC 19422K->18244K(259264K), 0.1601460 secs]
1220.002: [Full GC 26298K->18354K(259264K), 0.1672780 secs]
1222.871: [Full GC 41007K->17486K(259264K), 0.1767970 secs]
1224.257: [Full GC 38459K->17581K(259264K), 0.1708260 secs]
1228.508: [Full GC 31027K->17678K(259264K), 0.1934270 secs]
1230.842: [GC 41038K->17846K(259264K), 0.0027980 secs]
1231.091: [Full GC 23773K->17876K(259264K), 0.1648090 secs]
1233.377: [GC 41235K->18030K(259264K), 0.0043450 secs]
1234.627: [Full GC 27018K->17623K(259264K), 0.1681140 secs]
1238.083: [GC 40983K->18145K(259264K), 0.0053580 secs]
1238.236: [Full GC 26915K->17828K(259264K), 0.1658790 secs]
1240.558: [Full GC 32151K->17956K(259264K), 0.1687010 secs]
1243.685: [GC 41310K->18474K(259264K), 0.0058920 secs]
1246.029: [Full GC 41795K->18533K(259264K), 0.1784250 secs]
1249.400: [GC 41893K->18739K(259264K), 0.0035550 secs]
1249.741: [Full GC 22503K->17989K(259264K), 0.1702740 secs]
1252.402: [GC 41347K->18176K(259264K), 0.0039630 secs]
1252.516: [Full GC 20445K->18258K(259264K), 0.1678890 secs]
1254.473: [Full GC 37435K->18439K(259264K), 0.1891770 secs]
1257.912: [GC 41797K->18658K(259264K), 0.0034350 secs]
1258.627: [Full GC 28099K->18792K(259264K), 0.1701140 secs]
1259.558: [GC 42151K->19185K(259264K), 0.0040460 secs]
1259.685: [Full GC 24326K->17830K(259264K), 0.1797960 secs]
1261.675: [Full GC 35858K->17895K(259264K), 0.1747070 secs]
1265.409: [GC 41253K->18235K(259264K), 0.0045390 secs]
1265.480: [Full GC 21386K->18167K(259264K), 0.1647190 secs]
1266.987: [GC 41527K->18518K(259264K), 0.0042120 secs]
1267.097: [Full GC 23121K->18225K(259264K), 0.1638840 secs]
1269.256: [GC 41579K->18556K(259264K), 0.0034600 secs]
1269.907: [Full GC 25021K->17589K(259264K), 0.1682260 secs]
1272.214: [Full GC 29448K->17641K(259264K), 0.1673120 secs]
1274.376: [Full GC 32613K->17885K(259264K), 0.1710000 secs]
1278.034: [GC 41245K->18309K(259264K), 0.0044890 secs]
1278.139: [Full GC 20559K->18359K(259264K), 0.1699630 secs]
1281.824: [GC 41719K->18836K(259264K), 0.0042590 secs]
1281.869: [Full GC 22173K->17938K(259264K), 0.1710780 secs]
1282.883: [Full GC 38905K->18085K(259264K), 0.1729570 secs]
1285.470: [Full GC 29364K->18221K(259264K), 0.1712110 secs]
1287.186: [GC 41579K->18392K(259264K), 0.0037710 secs]
1287.648: [Full GC 34833K->18379K(259264K), 0.1722590 secs]
1293.044: [Full GC 36896K->17895K(259264K), 0.1790080 secs]
1295.344: [Full GC 39122K->17997K(259264K), 0.1739800 secs]
1298.695: [GC 41356K->18180K(259264K), 0.0035400 secs]
1299.139: [Full GC 27101K->18151K(259264K), 0.1662500 secs]
1301.236: [Full GC 29897K->18243K(259264K), 0.1670530 secs]
1304.222: [GC 41599K->18690K(259264K), 0.0051650 secs]
1304.631: [Full GC 26785K->17570K(259264K), 0.1685990 secs]
1307.040: [Full GC 35984K->17736K(259264K), 0.1714940 secs]
1308.610: [Full GC 33194K->17867K(259264K), 0.1732130 secs]
1310.245: [GC 41227K->18348K(259264K), 0.0046460 secs]
1310.270: [Full GC 20079K->17997K(259264K), 0.1622390 secs]
1316.119: [Full GC 31797K->17701K(259264K), 0.1767490 secs]
1317.765: [GC 41061K->17911K(259264K), 0.0034320 secs]
1318.459: [Full GC 36597K->18147K(259264K), 0.1772120 secs]
1319.623: [Full GC 32165K->18210K(259264K), 0.1702940 secs]
1323.339: [GC 41570K->18394K(259264K), 0.0035930 secs]
1323.362: [Full GC 20003K->18302K(259264K), 0.1621850 secs]
1328.455: [GC 41662K->18528K(259264K), 0.0031090 secs]
1329.080: [Full GC 26141K->17601K(259264K), 0.1714570 secs]
1330.502: [GC 40960K->18190K(259264K), 0.0055370 secs]
1331.248: [Full GC 33207K->17743K(259264K), 0.1716600 secs]
1332.504: [Full GC 33325K->17919K(259264K), 0.1707440 secs]
1334.322: [Full GC 25962K->17964K(259264K), 0.1647600 secs]
1339.043: [GC 41324K->18445K(259264K), 0.0053560 secs]
1339.431: [Full GC 30802K->18036K(259264K), 0.1760700 secs]
1340.706: [GC 41396K->18435K(259264K), 0.0049790 secs]
1340.788: [Full GC 19653K->18362K(259264K), 0.1679480 secs]
1341.402: [Full GC 37930K->18541K(259264K), 0.1789520 secs]
1343.397: [Full GC 38599K->18598K(259264K), 0.1745700 secs]
1345.654: [Full GC 38131K->17863K(259264K), 0.1768640 secs]
1349.079: [Full GC 40810K->18034K(259264K), 0.1751080 secs]
1351.329: [GC 41394K->18181K(259264K), 0.0031310 secs]
1351.630: [Full GC 22737K->18131K(259264K), 0.1667750 secs]
1353.752: [GC 41491K->18415K(259264K), 0.0039180 secs]
1353.771: [Full GC 19663K->18329K(259264K), 0.1658580 secs]
1356.021: [Full GC 33020K->17962K(259264K), 0.1772410 secs]
1362.446: [GC 41322K->18319K(259264K), 0.0041650 secs]
1362.707: [Full GC 28140K->18280K(259264K), 0.1717800 secs]
1364.104: [GC 41640K->18440K(259264K), 0.0035700 secs]
1364.219: [Full GC 19931K->18444K(259264K), 0.1673940 secs]
1367.044: [Full GC 41175K->18638K(259264K), 0.1774620 secs]
1369.008: [GC 41998K->18904K(259264K), 0.0033770 secs]
1370.808: [Full GC 39500K->17736K(259264K), 0.1779480 secs]
1372.395: [Full GC 38579K->17798K(259264K), 0.1732010 secs]
1374.965: [GC 41158K->17977K(259264K), 0.0032530 secs]
1375.530: [Full GC 32640K->18465K(259264K), 0.1768610 secs]
1376.498: [Full GC 37663K->18530K(259264K), 0.1755930 secs]
1379.187: [Full GC 34360K->17772K(259264K), 0.1767890 secs]
1381.635: [GC 41132K->17916K(259264K), 0.0030470 secs]
1382.740: [Full GC 33087K->17979K(259264K), 0.1725710 secs]
1384.342: [Full GC 40704K->18127K(259264K), 0.1782130 secs]
1386.079: [Full GC 37351K->18238K(259264K), 0.1749410 secs]
1388.360: [Full GC 37386K->17696K(259264K), 0.1768570 secs]
1390.025: [Full GC 29469K->17756K(259264K), 0.1694570 secs]
1393.734: [GC 41112K->18057K(259264K), 0.0038490 secs]
1394.247: [Full GC 26711K->17971K(259264K), 0.1697510 secs]
1395.559: [GC 41331K->18421K(259264K), 0.0046160 secs]
1395.724: [Full GC 22935K->18369K(259264K), 0.1683440 secs]
1399.015: [GC 41729K->18557K(259264K), 0.0031830 secs]
1400.459: [Full GC 24074K->17934K(259264K), 0.1763530 secs]
1403.708: [GC 41285K->18399K(259264K), 0.0047150 secs]
1403.906: [Full GC 26160K->18149K(259264K), 0.1707510 secs]
1406.124: [GC 41509K->18387K(259264K), 0.0035380 secs]
1406.848: [Full GC 29898K->18662K(259264K), 0.1756120 secs]
1407.882: [Full GC 36353K->18762K(259264K), 0.1732850 secs]
1409.476: [Full GC 31392K->18111K(259264K), 0.1766410 secs]
1413.341: [GC 41471K->18259K(259264K), 0.0029240 secs]
1414.016: [Full GC 23700K->18347K(259264K), 0.1689310 secs]
1416.973: [GC 41707K->18621K(259264K), 0.0032220 secs]
1417.033: [Full GC 21370K->18493K(259264K), 0.1729750 secs]
1418.844: [Full GC 41535K->18652K(259264K), 0.1788500 secs]
1421.566: [Full GC 37085K->17599K(259264K), 0.1771590 secs]
1426.447: [Full GC 39674K->17772K(259264K), 0.1779320 secs]
1427.655: [Full GC 34052K->17910K(259264K), 0.1752830 secs]
1428.736: [Full GC 31329K->18038K(259264K), 0.1709880 secs]
1431.035: [GC 41398K->18234K(259264K), 0.0033650 secs]
1431.545: [Full GC 32607K->17774K(259264K), 0.1744760 secs]
1435.344: [Full GC 35392K->17901K(259264K), 0.1731200 secs]
1440.290: [Full GC 39635K->18103K(259264K), 0.1759120 secs]
1443.216: [GC 41463K->18459K(259264K), 0.0039860 secs]
1443.627: [Full GC 28455K->18606K(259264K), 0.1717400 secs]
1446.677: [Full GC 31845K->17807K(259264K), 0.1757170 secs]
1448.217: [Full GC 36029K->17929K(259264K), 0.1723040 secs]
1451.897: [Full GC 40425K->18068K(259264K), 0.1773810 secs]
1453.303: [GC 41428K->18399K(259264K), 0.0043310 secs]
1454.383: [GC 41747K->18891K(259264K), 0.0066130 secs]
1454.603: [Full GC 26649K->18470K(259264K), 0.1726960 secs]
1455.862: [GC 41830K->19071K(259264K), 0.0057860 secs]
1455.919: [Full GC 23860K->18080K(259264K), 0.1716680 secs]
1459.396: [GC 41440K->18551K(259264K), 0.0048670 secs]
1459.560: [Full GC 21678K->18433K(259264K), 0.1685140 secs]
1460.305: [Full GC 28004K->18540K(259264K), 0.1708560 secs]
1463.360: [GC 41898K->19157K(259264K), 0.0053660 secs]
1463.385: [Full GC 19875K->18963K(259264K), 0.1695990 secs]
1465.299: [GC 42322K->19230K(259264K), 0.0037680 secs]
1466.243: [Full GC 30800K->18146K(259264K), 0.2014600 secs]
1468.739: [GC 41506K->18435K(259264K), 0.0042590 secs]
1469.240: [Full GC 23481K->18360K(259264K), 0.1682010 secs]
1470.849: [Full GC 37140K->18509K(259264K), 0.1753980 secs]
1473.283: [Full GC 28643K->18566K(259264K), 0.1716950 secs]
1475.513: [GC 41926K->18655K(259264K), 0.0024490 secs]
1476.303: [Full GC 28013K->17893K(259264K), 0.1730760 secs]
1479.100: [GC 41253K->18106K(259264K), 0.0032820 secs]
1479.114: [Full GC 19042K->18011K(259264K), 0.1668360 secs]
1480.705: [GC 41371K->18216K(259264K), 0.0033410 secs]
1480.820: [Full GC 21912K->18126K(259264K), 0.1680140 secs]
1483.212: [GC 41483K->18657K(259264K), 0.0068210 secs]
1483.612: [Full GC 32191K->18531K(259264K), 0.1748200 secs]
1484.237: [Full GC 27101K->17945K(259264K), 0.1720220 secs]
1487.355: [GC 41304K->18052K(259264K), 0.0028180 secs]
1487.453: [Full GC 18350K->18034K(259264K), 0.1671100 secs]
1491.399: [Full GC 30457K->18216K(259264K), 0.1750190 secs]
1493.152: [GC 41576K->18373K(259264K), 0.0030600 secs]
1495.040: [Full GC 35834K->18553K(259264K), 0.1844910 secs]
1496.486: [Full GC 40056K->18404K(259264K), 0.1839830 secs]
1497.604: [Full GC 40636K->18576K(259264K), 0.1802690 secs]
1499.708: [Full GC 32806K->18699K(259264K), 0.1755440 secs]
1502.358: [GC 42056K->19017K(259264K), 0.0035950 secs]
1503.448: [Full GC 39416K->19186K(259264K), 0.1810510 secs]
1504.321: [GC 42546K->19502K(259264K), 0.0041760 secs]
1504.523: [Full GC 26135K->18075K(259264K), 0.1737100 secs]
1506.421: [Full GC 34630K->18190K(259264K), 0.1749040 secs]
1509.521: [Full GC 34218K->18280K(259264K), 0.1738500 secs]
1512.404: [Full GC 40123K->18419K(259264K), 0.1785160 secs]
1514.910: [GC 41779K->18978K(259264K), 0.0046400 secs]
1515.057: [Full GC 21217K->18346K(259264K), 0.1729520 secs]
1516.312: [Full GC 32009K->18445K(259264K), 0.1742600 secs]
1519.535: [GC 41800K->18681K(259264K), 0.0033170 secs]
1521.938: [Full GC 39950K->18817K(259264K), 0.1806540 secs]
1522.918: [Full GC 39996K->18896K(259264K), 0.1770260 secs]
1525.240: [Full GC 27208K->18087K(259264K), 0.1766390 secs]
1527.746: [GC 41446K->18283K(259264K), 0.0030650 secs]
1529.193: [Full GC 31590K->18230K(259264K), 0.1739110 secs]
1531.467: [GC 41590K->18408K(259264K), 0.0031390 secs]
1531.621: [Full GC 20536K->18343K(259264K), 0.1684640 secs]
1534.052: [Full GC 39614K->18673K(259264K), 0.1790600 secs]
1536.308: [Full GC 41947K->18277K(259264K), 0.1831870 secs]
1540.110: [GC 41634K->18676K(259264K), 0.0037740 secs]
1540.655: [Full GC 22982K->18554K(259264K), 0.1718110 secs]
1543.403: [Full GC 40455K->18762K(259264K), 0.1808010 secs]
1544.456: [GC 42122K->19049K(259264K), 0.0056720 secs]
1544.623: [Full GC 24100K->19040K(259264K), 0.1734450 secs]
1547.598: [GC 42399K->19313K(259264K), 0.0031750 secs]
1547.782: [Full GC 21803K->17896K(259264K), 0.1733430 secs]
1550.856: [Full GC 38776K->18049K(259264K), 0.1790000 secs]
1554.027: [Full GC 39925K->18209K(259264K), 0.1794380 secs]
1554.868: [Full GC 36385K->18297K(259264K), 0.1765220 secs]
1557.076: [GC 41657K->18481K(259264K), 0.0033910 secs]
1557.170: [Full GC 23085K->17844K(259264K), 0.1733090 secs]
1558.265: [Full GC 21638K->17878K(259264K), 0.1694620 secs]
1563.060: [GC 41237K->18097K(259264K), 0.0033500 secs]
1564.856: [Full GC 32663K->18154K(259264K), 0.1754150 secs]
1566.025: [GC 41510K->18340K(259264K), 0.0031060 secs]
1566.042: [Full GC 19331K->18242K(259264K), 0.1685920 secs]
1568.406: [GC 41602K->18499K(259264K), 0.0034100 secs]
1568.794: [Full GC 29429K->18048K(259264K), 0.1775530 secs]
1571.351: [Full GC 41276K->18129K(259264K), 0.1805000 secs]
1573.344: [Full GC 38881K->18195K(259264K), 0.1760390 secs]
1575.800: [Full GC 26060K->18243K(259264K), 0.1733030 secs]
1577.789: [Full GC 30691K->18180K(259264K), 0.1765060 secs]
1580.336: [GC 41540K->18408K(259264K), 0.0033330 secs]
1582.005: [Full GC 32348K->18433K(259264K), 0.1778330 secs]
1583.438: [GC 41793K->18751K(259264K), 0.0039520 secs]
1583.913: [Full GC 25360K->18656K(259264K), 0.1724900 secs]
1587.323: [Full GC 35278K->18824K(259264K), 0.1789120 secs]
1590.612: [GC 42183K->19194K(259264K), 0.0040080 secs]
1591.305: [Full GC 32714K->18075K(259264K), 0.1783630 secs]
1591.920: [Full GC 32296K->18141K(259264K), 0.1737070 secs]
1593.748: [

JVM performance in case of JVM memory usage is high

Hi All
     Here is some query about JVM performance in case of JVM memory usage is high.
     I have a server of 16GB. For JVM 12GB and for OS 4GB.
     Let say, My Application creating many Unnecessary Objects and consumes very high memory.
     Also, there is a gaurenty that limit of memory is it never exceed 2GB.
     No, in worst scenario memory used by JVM is 2GB.Ok.
     I have free memory available for JVM is 10GB(16GB - 2GB - 4GB(any OS memory usage)).
     Now, for any Application processing I have 10GB.
     So, does it affect application processing for which I have 10GB.
     I mean does JVM performance decreses in high JVM memory usage even I have occupied more memory to JVM.

Hi All
     Here is some query about JVM performance in case of JVM memory usage is high.
     I have a server of 16GB. For JVM 12GB and for OS 4GB.
     Let say, My Application creating many Unnecessary Objects and consumes very high memory.
     Also, there is a gaurenty that limit of memory is it never exceed 2GB.
     No, in worst scenario memory used by JVM is 2GB.Ok.
     I have free memory available for JVM is 10GB(16GB - 2GB - 4GB(any OS memory usage)).
     Now, for any Application processing I have 10GB.
     So, does it affect application processing for which I have 10GB.
     I mean does JVM performance decreses in high JVM memory usage even I have occupied more memory to JVM.

What is the default memory allocation for JVM

Hi,
Can anybody please let me know the default heap memory allocation(both min & max) for JVM, if we don't provide memory arguments (-Xms -Xmx) on 32-bit linux & windows machines having 4GB RAM?
Thanks,
Suresh

user641407 wrote:
Hi,
Can anybody please let me know the default heap memory allocation(both min & max) for JVM, if we don't provide memory arguments (-Xms -Xmx) on 32-bit linux & windows machines having 4GB RAM?
Starting with 5.0, per the Sun VM docs.
http://download.oracle.com/javase/6/docs/technotes/tools/windows/java.html
+"-Xmsn ... The default value is chosen at runtime based on system configuration."+
+"-Xmxn ... The default value is chosen at runtime based on system configuration."+
What other documentation are you looking for?

Network stream fxp excess memory usage and poor performance

I'm trying to stream some datas à highspeed rate (3 channels à 1Mbytes/s) from my 9030 to my windows host. Because i don't need to use data on the rt side, i choose to forward FXP <+-,24,5> to my host throug a network stream.
To avoid data loose i choose to use a wide buffer of 6000000 with this buffer my memory usage grow from 441mo to 672Mo and my rio is unable to stream the data.
With sgl or double, memory usage is 441 to 491Mo and datas can be streamed continusly.
Anyone have encoutered this problem?

SQL Developer is java based and relies on the jvm's memory management.
I'm not aware of any memory leaks as such, but memory tends not to be returned to the system.
Queries which return large return sets tend to use a lot of memory (SQL Developer has to build a java table containing all the results for display).
You can restrict the maximum memory allocated by modifying settings in in <sqldeveloper>\ide\bin\ide.conf
The defaults are -
AddVMOption -Xmx640M
AddVMOption -Xms128M

JDK1.4.0.2 Memory usage on Win 2K.

By default Win2K does not yield much of the requested Java heap space in physical memory. It appears to give a small fraction to physical memory and the rest is kept in virtual memory.
I've tuned the platform to have only absolutely necessary system applications running, minimizing other apps memory usage, it always appears that the heap could be allocated in physical memory, but it is just not done by the OS.
My server has 2 Gb of ram, and my java app requests 1 Gb of heap space.
I see quite a bit of page faults when my app executes under load.
Looking at the memory meter in task manager, their appears to be easily more than 1Gb of free ram available, yet my process continues to page fault.
Is there a way to get the JVM to lock/retain more physical memory and reduce the need to use virtual memory so much? It really does not appear to be a memory contention issue with other apps? I'm using jvm 1.4.0.02 on a dual cpu del 1.5 Ghx with 2gb Ram.
Regards.

I am having same problem, did you get a solution yet.
Thanks
-Aaron

How to specify maximum memory usage for Java VM in Tomcat?

Does any one know how to setup memory usage for Java VM, such as "-Xmx256m" parameter, in Tomcat?
I'm using Tomcat 3.x in Apache web server on Sun Solaris platform. I already tried to add the following line into tomcat.properties, like:
wrapper.bin.parameters=-Xmx512m
However, it seems to me that this doesn't work. So, how about if my servlet will consume a large amount of memory that exceeds the default 64M memory boundary of Java VM?
Any idea will be appreciated.
Haohua

With some help we found the fix. You have to set the -Xms and -Xmx at installation time when you install Tomcat 4.x as a service. Services do not read system variables. Go to the command prompt in windows, and in the directory where tomcat.exe resides, type "tomcat.exe /?". You will see jvm_options as part of the installation. Put the -Xms and -Xmx variables in the proper place during the install and it will work.
If you can't uninstall and reinstall, you can apply this registry hack that dfortae sent to me on another thread.
=-=-=-=-=-=
You can change the parameters in the Windows registry. If your service name is "Apache Tomcat" The location is:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Apache Tomcat\Parameters
Change the JVM Option Count value to the new value with the number of parameters it will now have. In my case, I added two parameters -Xms100m and -Xmx256m and it was 3 before so I bumped it to 5.
Then I created two more String values. I called the first one I added 'JVM Option Number 4' and the second 'JVM Option Number 5'. Then I set the value inside each. The first one I set to '-Xms100m' and the second I set to '-Xmx256m'. Then I restarted Tomcat and observed when I did big processing the memory limit was now 256 MB, so it worked. Hope this helps!
=-=-=-=-=
I tried this and it worked. I did not want to have to go through the whole reinstallation process, so this was best for me.
Thanks to all who helped on this.

Memory Usage in WinTaskManger vs heap size

hello,
I have exactly the same problem as in the topic "Windows Task Manager vs. Heap", posted at Dec 10, 2004 5:17 AM, by jorgeHX.
Here are the symptoms:
1) My application starts at 20MB seen by windows task manager
2) I use profiler to monitor the heap. Heap is always working very healthly - heap size in the profiler increases by a minimum until the gc comes around so that the used heap size drops down again.
3) However, after doing a relatively memory-consuming operation (loop of String indexing, patterning ..etc.), the memory usage in windows task manager goes up couple of MBs but never drops down.
4) Then I go manually free the heap (System.gc()), I can see GC is freeing heap. However, the memory in windows task manager remains no change, no matter how many times I force the garbabge collection.
This is a bad thing - if my application keeps doing that memory-consuming operation again and again, the memory seen in the windows task manager will be growing and growing to hundreds of MBs until the windows alerts "low on virtual memory".
I tried everything already. I set every instance = null at the end, I delete every reference but the memory just keeps increasing! WHY?????
Anyone can help me charactorize the problem? I am so in dark!!
Ryan-Chi

I guess my problem can also be interpretated as
"Why doesn't JVM return memory to OS?"
It does, depending on the setting of the -XX:MaxHeapFreeRatio option. "Normal" operation using the default setting does not usually cause memory to be returned to the os.
Search for this option term for explanations.

Best GC options for minimum memory usage?

It seems that the more -Xmx memory I set, the more memory my app is using. Alas, the garbage collector is controlling the memory by itself and even System.gc() does not garbage collect all unused objects.
There are lots of parameters at http://java.sun.com/docs/hotspot/VMOptions.html, but what's the most aggressive one(s) to free unused memory as soon as possible?

Hi Martin,
please, let me tell you a few basic things first:
- under good circumstances the GC runs only when some heap space is full and more
memory is needed.
- even if the GC frees memory it will usually not be returned to the OS immediately but only
when some other process needs it. This means you will not see processes shrink
immediately when the JVM reduces its heap sizes. This is certainly true for Solaris.
- it is bad practice to call System.gc() in your Java code.
- the smaller the configured heap the more time (in percent) the JVM will use for GC. This is
because the memory in use has to be searched each time the GC runs
- the heap actually used by your JVM adds to the real memory size of the process
- the max values (-Xmx + -XX:MaxPermSize) add to the virtual memory size of the process
even if these max values are not actually used
Now, knowing these, to minimize your actual heap usage, I recommend you the following settings:
-Xms20m # set this to the minimum you will need, omiting it only slows down JVM startup
-Xmx200m # set this to the maximum you might need or can spare
-XX:MinHeapFreeRatio=20 # minimum heap percentage free after a Full GC, default=40
-XX:MaxHeapFreeRatio=40 # maximum heap percentage free after a Full GC, default=70
-XX:NewSize=10m # don't make it too small because this will make GC less efficient, the
# actual value depends on the nature of the app
-XX:MaxNewSize=10m # ditto, you can only make it larger than NewSize
-XX:SurvivorRatio=6 # try to compensate for small NewSize
-XX:TargetSurvivorRatio=80 # don't waste survivor space memory
I hope this helps. Please, keep in mind that a GC-based system is not really meant to
minimize memory usage!

Problem with Firefox and very heavy memory usage

For several releases now, Firefox has been particularly heavy on memory usage. With its most recent version, with a single browser instance and only one tab, Firefox consumes more memory that any other application running on my Windows PC. The memory footprint grows significantly as I open additional tabs, getting to almost 1GB when there are 7 or 8 tabs open. This is as true with no extensions or pluggins, and with the usual set, (firebug, fire cookie, fireshot, XMarks). Right now, with 2 tabs, the memory is at 217,128K and climbing, CPU is between 0.2 and 1.5%.
I have read dozens of threads providing "helpful" suggestions, and tried any that seem reasonable. But like most others who experience Firebug's memory problems, none address the issue.
Firefox is an excellent tool for web developers, and I rely on it heavily, but have now resorted to using Chrome as the default and only open Firefox when I must, in order to test or debug a page.
Is there no hope of resolving this problem? So far, from responses to other similar threads, the response has been to deny any responsibility and blame extensions and/or pluggins. This is not helpful and not accurate. Will Firefox accept ownership for this problem and try to address it properly, or must we continue to suffer for your failings?

55%, it's still 1.6Gb....there shouldn't be a problem scanning something that it says will take up 300Mb, then actually only takes up 70Mb.
And not wrong, it obviously isn't releasing the memory when other applications need it because it doesn't, I have to close PS before it will release it. Yes, it probably is supposed to release it, but it isn't.
Thank you for your answer (even if it did appear to me to be a bit rude/shouty, perhaps something more polite than "Wrong!" next time) but I'm sitting at my computer, and I can see what is using how much memory and when, you can't.

Jvm 1.4,1.5 default memory usage in Ram in different operating systems

Similar Messages

Maybe you are looking for