Memory riser question

I have another 2GB (2 x 1GB) ready to install in my Pro when it arrives. I know that I should keep the 1GB (2 x 512) on one of the riser cards and put the additional memory on the other riser card. I’ve also seen it stated that the larger memory should be on riser card one and the smaller memory on riser card two. The question is can I pull out both riser cards, slide the one with the pair of 512MB modules into the number two position, add my new memory to the other card, and then slide that into the number one position, or do I need to pull the two 512MB sticks off the riser card its on and move it to the other card. Or more simply put can the position of the cards be swapped or do they need to be in their original positions.
Mac Pro Mac OS X (10.4.7)

Basically, for best performance you need to have Slots 1/2 on both Risers filled. From then, performance is best when you have RAM totals that are even (or 1GB difference) between them. So if you have 1GB RAM on Riser A you should have 1 or 2GB on Riser B.
There is NO difference between the Risers. They are both the same and should be treated as such.

Similar Messages

Fan noise. Was told bad memory riser.

My fans suddenly became incredibly loud. Did SMC etc. to no avail. Took it in, and was told the computer diagnosed it as a bad memory riser sensor. Went home and tried every configuration (top riser out, bottom out, swapped etc) and each time the fans still went insane.
This can't posibbly be a riser sensor issue can it? Unless they are both bad?!
Thank you!

My apologies for this double post.
I had a good deal of confusion logging into my account for the first time, which led to me asking this question twice. Please refer to https://discussions.apple.com/message/18971964#18971964
if you have the same issue, or want to reply.
Thanks!

I want to check all functions of PCI 6534.I have read the user manual..I have some memory related questions.Please help me for that.

I want to check all functions of PCI 6534.I have read the user manual..I have some memory related questions.Please help me for that.
1.)If i am using the continuous output mode.and the size of generated data is less than 32 MB.If i want to preload the memory,what should i do?I want that first of all i load all my data to onboard memory & then i want to make start the transfer between 6534 & peripheral.Is it possible?As per me it should be.Plz tell me how should i do this?I think that in normal procedure the transfer between 6534-peripheral & outputting data from pc buffer to onboard memory works parallely.But i don't want this.Is it poss
ible?
(2).Similarly in finite input operation(pattern I/O) is it possible to preload the memory and then i read it?Because i think that the PC memory will be loaded automatically when 6534 acquires the data and then when we use DIO read vi the pc buffer data will be transferred to application buffer.If this is true,i do not want this.Is it possible?
(3) One more question is there if i am using normal operation onboard memory will be used bydefault right?Now if i want to use DMA and if i have data of 512 bytes to acquire.How will it work and how should i do it?Please tell me the sequence of operations.As per my knowledge in normal DMA operation we have 32 Bytes FIFO is there so after acquisition of 32 bytes only i can read it.How it will known to me that 32 bytes acquisition is complete?Next,If i want to acquire each byte separately using DMA interrupts what should i do?Provide me the name of sourse from which i can get details about onboard memory & DMA process of 6534 specifically
(4).In 6534 pattern Input mode,if i want to but only 10 bits of data.and i don't want to waste any data line what should i do?

Hi Vishal,
I'll try to answer your questions as best I can.
1) It is definitely possible to preload data to the 32MB memory (per group) and start the acquisition after you have preloaded the memory. There are example programs on ni.com/support under Example Code for pattern generation and the 6534 that demonstrate which functions to use for this. Also, if your PC memory buffer is less than 32MB, it will automatically be loaded to the card. If you are in continuous mode however, you can choose to loop using the on-board memory or you can constantly be reading the PC memory buffer as you update it with your application environment.
2) Yes, your data will automatically be loaded into the card's onboard memory. It will however be transferred as quickly as possible to the DMA FIFO on the card and then transferred to the PC memory buffer through DMA. It is not going to wait until the whole onboard memory is filled before it transfers. It will transfer throughout the acquisition process.
3) Vishal, searching the example programs will give you many of the details of programming this type of application. I don't know you application software so I can't give you the exact functions but it is easiest to look at the examples on the net (or the shipping examples with your software). Now if you are acquiring 512 bytes of data, you will start to fill your onboard memory and at the same time, data will be sent to the DMA FIFO. When the FIFO is ready to send data to the PC memory buffer, it will (the exact algorithm is dependent on many things regarding how large the DMA packet is etc.).
4) If I understand you correctly, you want to know if you waste the other 6 bits if you only need to acquire on 10 lines. The answer to this is Yes. Although you are only acquiring 10 bits, it is acquired as a complete word (16bits) and packed and sent using DMA. You application software (NI-DAQ driver) will filter out the last 6 bits of non-data.
Hope that answers your questions. Once again, the example code on the NI site is a great place to start this type of project. Have a good day.
Ron

Enterprise 420R Memory upgrade question...

I wish to upgrade/expand the memory in my 420R from 2Gb to 4Gb. I have a complete set of memory totaling 4Gb from another 420R with boot issues (to be resolved later). I remove all memory fro the ailing 420R, set aside, then remove original 2Gb from 420R and replaced with the 4Gb of memory. When booting the server, it still reports only 2Gb RAM (the "replacement" ram from the ailing 420R was reported correctly on that machine; I removed the memory riser card, still populated, and all MB RAM modules, and installed this into the "original" working 420R). Is there something in NVRAMRC or some other setting that needs attention in order for the system to see all 4Gb? FYI: I performed a "boot -r" after booting to the PROM screen first, but the system seems to "hang" during this, with the following Response:
{0} ok boot -r
Resetting...
SC Control: EWP:0 IAP:0 FATAL:0 WAKEUP:0 BXTR:0 BPOR:0 SXIR:0 SPOR:1
Probing Memory Bank #0 512 512 512 512 : 2 Gigabytes
Probing Floppy: No drives detected
Probing EBUS: Nothing there
Probing UPA slot at 1e,0 Nothing there
Probing UPA slot at 1d,0 Nothing there
Probing /pci@1f,4000 at Device 1 pci108e, 1000 network
Probing /pci@1f,4000 at Device 3 scsi disk tape scsi disk tape
Probing /pci@1f,4000 at Device 2 TSI, gfxp
Probing /pci@1f,4000 at Device 4 scsi disk tape scsi disk tape
Probing /pci@1f,4000 at Device 5 Nothing there
Probing /pci@1f,2000 at Device 1 Nothing there
The the system brings up the startup info (Sun's Logo, and...)
Sun Enterprise 420R (4x UltraSPARC-II 450MHx), keyboard
OpenBoot 3.31, 2048 MB memory installed, Serial #1515326
Ethernet address 8:0:20:e7:38:70, Host ID: 8-e72870
...and the cursor just sits there NOT flashing, no useable prompt. System appears to hang here and does not seem inclined to proceed further. Keyboard will not initiate a power-off, nor do any keys seem to work. If I initiate a power-off at the front panel switch, then a Power On from the keyboard, I get the same thing, and the system does NOT boot.
Any Ideas, anyone?? I am not very well versed in SUN hardware, but was "gifted" these systems (plus some drive arrays and a couple of 220Rs). I am sure these systems were fully functional when removed from service. I would like to use them as either Web servers or possibly as "File System" servers, for B/U and archive purposes.
Regards...
Mime Youngblood
mikey5555(AT)consolidated.net

haroldkarl,
just took all memory modules out for an "eyeball" and found the following:
All modules are "Samsung" from Korea.
2ea M344C1683DT3-C60C1 (0111 in upper right corner of label)
8ea M344C1683DT2-C60E0 (0035 in upper right corner of label)
6ea M344C1683DT2-C60E0 (0038 in upper right corner of label)
(this taken from the ONLY small square paper tag on one side of each module, the side without the 2 labels with barcodes)
These modules were installed in another 420R, and it reported 4GB in the "header" of the boot prom screen, while they only show 2GB in this 2nd 420R. Assuming these modules will work with each other, is there a preferred order or "pairing" of these slightly disimilar pieces?
I did check for fully seated modules b4 removing, but did not find any that were obviously not seated well.
Regards...
TexasMike
mikey5555 AT consolidated.net

Firefox 27 memory leak (/questions/978195)

I already did this, sorry , but now I include the automated information.....
More than 6GB in 3 hours (MacOSX 10.7.5, 16Gb RAM)
(No time personally to look at this but, I have tagged it as escalate)

I will make a quick comment, but am unlikely to get back to this again before the weekend.
First do not think we are ignoring this or saying it is not a problem. It is a case of it is something often difficult to pin down and must initially be checked and compared with Firefox in a clean configuration, and using memory figures from the Firefox's reporter about:memory.
If you can ramp up memory usage to 6GB in only 3 hours at least it should be relatively easy to demonstrate whether or not something prevents that from happening.
As a test please
*Make an new additional Firefox Profile,
*Run Firefox in Firefox's safe mode
*With all plugins disabled
* Look at memory use by using ''about:memory''
* Browse for a few hours, has the problem now disappeared ?
Instructions and discussions about this can be seen in thread
* ''Firefox 26 on OS X 10.9.1 still has huge memory usuage (leak) which leads to crash'' [/questions/981674]
*Thread mentioned in tile is <br />''Firefox 25 still has memory leaks'' [/questions/978195]

P45 Neo3-FR memory problem / questions

Hello all
My old motherboard just died on me so yesterday I upgraded to a P45 Neo3-FR with an Intel E8500. Problem is that I can't get it to boot up with my old memory (4 x 1Gb modules as below). Most of the time the PC doesn't do anything, no screen, no post, but occasionally some weird characters at the top of the screen. I have put in some old DDR2 RAM and the system starts up OK. I bought this board as the MSI spec page says it supports 1066 memory.
Questions,
1) Is there any chance of getting this memory working in the board?
2) If so, how?
3) If not, what should I replace it with?
4) Do I need to touch the 2 jumpers to change the FSB. I left them on default and everything "seems" to be working OK but I guess I should be setting them to 333 for my CPU?
5) I have installed 2 system fans on the MB connectors. The fans are spinning but the speeds are not being reported in the BIOS. Any ideas?
6) Is there a comprehensive setup guide for this board anywhere on this forum? There was an excellent one for my old MSI board and I'm not finding the manual to be much help to be honest.
Thanks very much (in advance) for any help with all this.
P.S. I don-t know what BIOS version the board came with. I will check it when I get home.
Intel E8500
P45 Neo3-FR (PCB 1.0)
4Gb Corsair TWIN2X2048-8500C5DF
ASUS 8800GTX
Zalman 460W PSU

Quote
I bought this board as the MSI spec page says it supports 1066 memory.
Note that is says "1066* (OC)" on the product page. The Intel P45 Chipset does not natively support DDR2-1066 memory modules.
This is the datasheet for your Corsair Memory modules:
http://www.corsair.com/_datasheets/TWIN2X2048-8500C5DF.pdf
As you can see, these modules are essentially DDR2-800 modules and that DDR2-1066 @2.1-2.2V is an overclocking rating that requires non-standard voltage settings. Those OC Settings are pre-programmed into the SPD Chips of your memory modules via an EPP-Profile which is essentially an overclocking profile which is for NVIDIA Chipset boards, not for Intel Chipset boards. Even if the BIOS is able to notice the DDR2-1066 EPP profile and decides to AUTO-memory frequency to 1066 MHz, it is not able to raise the memory voltage accordingly (it can't, because as I said, EPP Profile Information and settings parameters are for NVIDIA Chipset.)
Do you see now, why your system won't boot?
Try this:
- try one of the factory overclocked Corsair stick alone
If that works, lower memory frequency to DDR2-800 in BIOS and check again, if the system will boot with four sticks (you may have to raise memory voltage slightly.
If that fails, put in one of your DDR2-800 sticks, then set FSB/DRAM Ratio to 1:1, save an exit and then try again with your factory overclocked modules.

I usually have 30 tabs opened, and the memory rises in a unexpected way, so that when it reaches 1.2GB, firefox crashes. Also If, for e.g. firefox is consuming 700MB of memory (with a lot of tabs opened), and if i close those tabs and leave just 2 or 3 op

I usually have 30 tabs opened, and the memory rises in a unexpected way, so that when it reaches 1.2GB, firefox crashes. Also If, for e.g. firefox is consuming 700MB of memory (with a lot of tabs opened), and if i close those tabs and leave just 2 or 3 opened, the memory usage does not drop and remains at the 700MB. Thanks for your attention. Regards, Ricardo
== Crash ID(s) ==
bp-765e3c37-0edc-4ed6-a4e9-7ed612100526

I have the same sort of problem with 30-40 tabs, with memory usage growing until crash. It seems a lot worse after restarting from standby mode on Vista - it's often highly unresponsive for a while, then crashes.
I have a fair few plug-ins running, one of the benefits of Firefox.
Is their a way I can log memory use of parts of Firefox, particularly the plug-ins?

Memory upgrade question / mixing dimms

Hi ,
i`m wanting to add another 1gb of ram to my 875P Neo-FIS2R. I currently have 2 x kingston kvr400x64c25/512 512mb ddr400 cl2.5 and want to add
a couple more. I`ve seen slightly cheaper (and in stock) the VR400X64C3A/512 (512MB 400MHz DDR CL3 Non-ECC 3-3-3 DIMM).
question is will this new pair work ok with my existing pair?
thanks in advance
Paul

Here's a link to the Test Report for your board. Scroll down to the memory pic and click on it. Then scroll down to the PC3200 area, that will list approved RAM for your mainboard.
http://www.msi.com.tw/html/products/mainboard/testreport_pdf/6758/memory.pdf

Memory problems (/questions/967643)

Some basics
Firefox 30
Windows XP SP3
Technical level
I am a software developer but have no experience building or debugging firefox or any of the other mozilla products. I am willing to provide debug information as needed. I also have a background in QA and testing so I am not afraid to roll up my sleeves and help iron out some of these issues if given some guidance on how to proceed.
Troubleshooting Information:
I have the Troubleshooter installed but don't see the data.
I also can't see the educated guesses about the current browser and operating system when I click the "See the data" and "Show details" links. I generally browse always in private mode. I have attached a list of addons at the bottom just in case.
Firefox seems to leak both memory and virtual memory during routine web surfing. By Routine, I am doing the following:
1. Opening Gmail and reading all my mail. After I am done, I close the tab. I probably go through 100-200 emails at a time.
2. Go to Google News and read some stories. I will share some of them using the Buffer This Page addon. I will close the tab when I am done.
3. Go to Slashdot and read all the days stories. I will close the tab when I am done.
4. Maybe go to facebook or twitter and catch up on some updates. I will close the tab when I am done.
After that, depending on how long I leave firefox open with no activity, it will just continue to use the same amount of physical and virtual memory as it was using at peak. It is almost like it keeps requesting resources and never frees them until I completely close firefox and sometimes kill the firefox.exe process in Windows Task Manager.
As a point of reference, after doing the above tasks and trying to research this issue by checking about:addons-memory (which currently shows about 100 MB of known memory usage) as well as researching this support site, I am up to almost 600 MB. Some days, it will exhaust all my systems physical and virtual memory until it starts paging. As a result, I keep firefox closed as soon as I am done using it. I use other apps to check email and only use firefox for very short periods of time.
The following are the current addons I see installed and enabled:
about:addons-memory 8
ActiveInbox for Gmail and Google Apps 5.0.12
Adblock Plus 2.6.3
Bitdefender QuickScan 0.9.9.119
Buffer for Firefox 2.6.0
DoNotTrackMe: Online Privacy Protection 3.2.1113
DownThemAll! 2.0.17
DownThemAll! AntiContainer 1.3
HTTPS-Everywhere 3.5.3
IE Tab 2(FF 3.6+) 5.12.12.1
Launchy 4.4.0
Linky 3.0.0
Neo Diggler 1.0.6
NoScript 2.6.8.33
Rapportive 1.4.0.1
Troubleshooter 1.1a
YouTube Video and Audio Downloader 0.3.6.2
The folloiwng are disabled:
Privacy Badger Firefox 0.1.4
ThinkVantage Password Manager 2.0

I admire you for being willing to get your hands dirty, I will pull out the profiler and memory bug instructions:
*this will tell you more about the about:memory page: [https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIMemoryReporter]
*Memory leak tools [https://wiki.mozilla.org/Performance:Leak_Tools](not sure how old that is)
*[https://wiki.mozilla.org/Platform/Memory_Reporting]
Also the Telementary data sent on the browsers can help improve the performance. There are also automated tests done to check performance of different platforms.
If you are interested in providing a website example this could help create a bug. With the websites you tested/mentioned in your description, there are have these tools to test the performance of the profile as well: This will test the javascript engine on desktop: [https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Reporting_a_Performance_Problem]
There is also DTrace that can help optimize development on javascript pages [https://wiki.mozilla.org/Performance/Optimizing_JavaScript_with_DTrace#Tips]
I understand that add on memory is assumed to only measure: " about 100 MB of known memory usage) as well as researching this support site, I am up to almost 600 MB" - Another troubleshooting step for running Firefox without addons is Safe Mode, does the memory stay high without them as well?
The troubleshooting info will be in the link in the right column of this question's page. "More System Details" is the title.
What is the webGlRenderer message? "TrynewDriver"
Also I invite you to get involved in QA if you have some free time. The contacts page for Firefox Desktop is: [https://wiki.mozilla.org/QA/Desktop_Firefox/GetInvolved Desktop_Firefox Get involved] :-)

Ancient RHEL3 Running Oracle Rac 10G - memory utilization question

As all good things must happen the crappy old systems that never get upgraded come back to bite you.
I have a 4 node RAC cluster running Linux RHEL3. I know .. would love to upgrade it .. but that will take time. Looking for at survival at this point. The system is experiencing High I/O wait. Now, my background is mainly Solaris/AIX and not Linux. So as I work through this problem I am unsure of what I am seeing, since Linux maybe handling memory differently on this OS.
This is what I am seeing:
High I/O wait as shown by TOP
Disk Access Time and Utilization : pretty good .. no device utilized over 30% and <20 millisecond response times from the drives
The real Question is in memory usage:
Host: 32GB
OS: Red Hat Enterprise Linux AS release 3 (Taroon Update 9)
model name : AMD Opteron (tm) Processor 880
Please .. I know its old but try and not laugh.......
The box has 32GB of Memory and I am told by the DBAs that OEM is reporting that SGA is sized correctly and memory ISN"T the problem. But disk access time/utilization isn't really pointing to a particular problem with the OS. The disks are all provided by a SAN.
However, when I look at TOP .. I see that the largest oracle process in RSS size is 8G .. now on all other platforms .. AIX/Solaris when using TOP .. all oracle processes that connect to the SGA will show the full size of SGA. So this is my question. Does Linux do this differently... for the DBAs to tell me SGA is set to 20GB and to only see top showing process with 8GB .. this has me confused. Is the SGA really being set to 20GB????
I can see in a pmap <oracle process> that it appears to be attached but just wanting to rule out a simple Oracle / Linux configuration problem first.
I've included a pmap of both a current Linux process on the troubled system and a pmap of a current oracle solaris host.
Linux
[root@lnxracbo2a proc]# pmap 15013
15013: oracle
Start Size Perm Mapping
00400000 94192K r-xp /oracle/product/10.2.0.4apr09/bin/oracle
060fc000 436K rw-p /oracle/product/10.2.0.4apr09/bin/oracle
06169000 792K rwxp [ anon ]
60000000 24119296K rw-s /SYSVfa491508
2a95556000 1108K r-xp /lib64/ld-2.3.2.so
2a9566b000 4K rw-p /lib64/ld-2.3.2.so
2a9566c000 4K rw-p [ anon ]
2a9566d000 164K r-xp /oracle/product/10.2.0.4apr09/lib/libskgxp10.so
2a95696000 1024K ---p /oracle/product/10.2.0.4apr09/lib/libskgxp10.so
2a95796000 8K rw-p /oracle/product/10.2.0.4apr09/lib/libskgxp10.so
2a95798000 944K r-xp /oracle/product/10.2.0.4apr09/lib/libhasgen10.so
2a95884000 1024K ---p /oracle/product/10.2.0.4apr09/lib/libhasgen10.so
2a95984000 24K rw-p /oracle/product/10.2.0.4apr09/lib/libhasgen10.so
2a9598a000 24K rw-p [ anon ]
2a95990000 8K r-xp /oracle/product/10.2.0.4apr09/lib/libskgxn2.so
2a95992000 1020K ---p /oracle/product/10.2.0.4apr09/lib/libskgxn2.so
2a95a91000 4K rw-p /oracle/product/10.2.0.4apr09/lib/libskgxn2.so
2a95a92000 428K r-xp /oracle/product/10.2.0.4apr09/lib/libocr10.so
2a95afd000 1024K ---p /oracle/product/10.2.0.4apr09/lib/libocr10.so
2a95bfd000 8K rw-p /oracle/product/10.2.0.4apr09/lib/libocr10.so
2a95bff000 256K r-xp /oracle/product/10.2.0.4apr09/lib/libocrb10.so
2a95c3f000 1024K ---p /oracle/product/10.2.0.4apr09/lib/libocrb10.so
2a95d3f000 4K rw-p /oracle/product/10.2.0.4apr09/lib/libocrb10.so
2a95d40000 4K rw-p [ anon ]
2a95d41000 444K r-xp /oracle/product/10.2.0.4apr09/lib/libocrutl10.so
2a95db0000 1020K ---p /oracle/product/10.2.0.4apr09/lib/libocrutl10.so
2a95eaf000 20K rw-p /oracle/product/10.2.0.4apr09/lib/libocrutl10.so
2a95eb4000 8K rw-p [ anon ]
2a95eb6000 8492K r-xp /oracle/product/10.2.0.4apr09/lib/libjox10.so
2a96701000 1020K ---p /oracle/product/10.2.0.4apr09/lib/libjox10.so
2a96800000 1568K rw-p /oracle/product/10.2.0.4apr09/lib/libjox10.so
2a96988000 32K r-xp /oracle/product/10.2.0.4apr09/lib/libclsra10.so
2a96990000 1024K ---p /oracle/product/10.2.0.4apr09/lib/libclsra10.so
2a96a90000 4K rw-p /oracle/product/10.2.0.4apr09/lib/libclsra10.so
2a96a91000 4K rw-p [ anon ]
2a96a92000 112K r-xp /oracle/product/10.2.0.4apr09/lib/libdbcfg10.so
2a96aae000 1024K ---p /oracle/product/10.2.0.4apr09/lib/libdbcfg10.so
2a96bae000 8K rw-p /oracle/product/10.2.0.4apr09/lib/libdbcfg10.so
2a96bb0000 3004K r-xp /oracle/product/10.2.0.4apr09/lib/libnnz10.so
2a96e9f000 1020K ---p /oracle/product/10.2.0.4apr09/lib/libnnz10.so
2a96f9e000 708K rw-p /oracle/product/10.2.0.4apr09/lib/libnnz10.so
2a9704f000 12K rw-p [ anon ]
2a97069000 4K r-xp /usr/lib64/libaio.so.1
2a9706a000 1020K ---p /usr/lib64/libaio.so.1
2a97169000 4K rw-p /usr/lib64/libaio.so.1
2a9716a000 4K rw-p [ anon ]
2a9716b000 12K r-xp /lib64/libdl-2.3.2.so
2a9716e000 1020K ---p /lib64/libdl-2.3.2.so
2a9726d000 4K rw-p /lib64/libdl-2.3.2.so
2a9726e000 540K r-xp /lib64/tls/libm-2.3.2.so
2a972f5000 1024K ---p /lib64/tls/libm-2.3.2.so
2a973f5000 4K rw-p /lib64/tls/libm-2.3.2.so
2a973f6000 60K r-xp /lib64/tls/libpthread-0.60.so
2a97405000 1024K ---p /lib64/tls/libpthread-0.60.so
2a97505000 4K rw-p /lib64/tls/libpthread-0.60.so
2a97506000 20K rw-p [ anon ]
2a9750b000 80K r-xp /lib64/libnsl-2.3.2.so
2a9751f000 1020K ---p /lib64/libnsl-2.3.2.so
2a9761e000 8K rw-p /lib64/libnsl-2.3.2.so
2a97620000 8K rw-p [ anon ]
2a97622000 1264K r-xp /lib64/tls/libc-2.3.2.so
2a9775e000 1020K ---p /lib64/tls/libc-2.3.2.so
2a9785d000 20K rw-p /lib64/tls/libc-2.3.2.so
2a97862000 1480K rw-p [ anon ]
2a979d4000 48K rw-p /dev/zero
2a979e0000 64K rw-p /dev/zero
2a979f0000 64K rw-p /dev/zero
2a97a00000 64K rw-p /dev/zero
2a97a10000 64K rw-p /dev/zero
2a97a20000 64K rw-p /dev/zero
2a97a30000 64K rw-p /dev/zero
2a97a40000 64K rw-p /dev/zero
2a97a50000 16K rw-p /dev/zero
2a97a54000 640K rw-p /dev/zero
2a97af4000 640K rw-p /dev/zero
2a97b94000 128K rw-p /dev/zero
2a97bb4000 128K rw-p /dev/zero
2a97bd4000 128K rw-p /dev/zero
2a97bf4000 128K rw-p /dev/zero
2a97c14000 128K rw-p /dev/zero
2a97c34000 128K rw-p /dev/zero
2a97c54000 64K rw-p /dev/zero
2a97c64000 64K rw-p /dev/zero
2a97c74000 512K ---p /dev/zero
7fbffe4000 112K rwxp [ stack ]
mapped: 24255304K writeable/private: 8000K shared: 24119296K
Solaris
admin-srv403[2]/ # pmap 5467
5467: oracleorprd26a (LOCAL=NO)
0000000100000000 97696K r-x-- /oracle/product/10.2.0.4.4/bin/oracle
0000000106066000 672K rwx-- /oracle/product/10.2.0.4.4/bin/oracle
000000010610E000 1952K rwx-- [ heap ]
0000000380000000 8388632K rwxsR [ ism shmid=0x4268 ]
FFFFFFFF7B070000 64K rw--- [ anon ]
FFFFFFFF7B100000 64K rw--- [ anon ]
FFFFFFFF7B110000 64K rw--- [ anon ]
FFFFFFFF7B120000 64K rw--- [ anon ]
FFFFFFFF7B130000 64K rw--- [ anon ]
FFFFFFFF7B140000 64K rw--- [ anon ]
FFFFFFFF7B150000 64K rw--- [ anon ]
FFFFFFFF7B160000 64K rw--- [ anon ]
FFFFFFFF7B170000 64K rw--- [ anon ]
FFFFFFFF7B19E000 8K rwxs- [ anon ]
FFFFFFFF7B200000 8K rwx-- [ anon ]
FFFFFFFF7B300000 8K r-x-- /usr/lib/sparcv9/libmd5.so.1
FFFFFFFF7B402000 8K rwx-- /usr/lib/sparcv9/libmd5.so.1
FFFFFFFF7B500000 8K rwx-- [ anon ]
FFFFFFFF7B600000 16K r-x-- /usr/lib/sparcv9/libmp.so.2
FFFFFFFF7B704000 8K rwx-- /usr/lib/sparcv9/libmp.so.2
FFFFFFFF7B800000 8K rwx-- [ anon ]
FFFFFFFF7B900000 216K r-x-- /usr/lib/sparcv9/libm.so.1
FFFFFFFF7BA34000 16K rwx-- /usr/lib/sparcv9/libm.so.1
FFFFFFFF7BB00000 32K r-x-- /usr/lib/sparcv9/librt.so.1
FFFFFFFF7BC08000 8K rwx-- /usr/lib/sparcv9/librt.so.1
FFFFFFFF7BD00000 32K r-x-- /usr/lib/sparcv9/libaio.so.1
FFFFFFFF7BE08000 8K rwx-- /usr/lib/sparcv9/libaio.so.1
FFFFFFFF7BE0A000 8K rwx-- /usr/lib/sparcv9/libaio.so.1
FFFFFFFF7BF00000 728K r-x-- /usr/lib/sparcv9/libc.so.1
FFFFFFFF7C0B6000 56K rwx-- /usr/lib/sparcv9/libc.so.1
FFFFFFFF7C0C4000 8K rwx-- /usr/lib/sparcv9/libc.so.1
FFFFFFFF7C100000 8K rwx-- [ anon ]
FFFFFFFF7C200000 8K r-x-- /usr/lib/sparcv9/libsched.so.1
FFFFFFFF7C302000 8K rwx-- /usr/lib/sparcv9/libsched.so.1
FFFFFFFF7C400000 8K rwx-- /usr/lib/sparcv9/libdl.so.1
FFFFFFFF7C500000 32K r-x-- /usr/lib/sparcv9/libgen.so.1
FFFFFFFF7C608000 8K rwx-- /usr/lib/sparcv9/libgen.so.1
FFFFFFFF7C700000 48K r-x-- /usr/lib/sparcv9/libsocket.so.1
FFFFFFFF7C80C000 16K rwx-- /usr/lib/sparcv9/libsocket.so.1
FFFFFFFF7C900000 672K r-x-- /usr/lib/sparcv9/libnsl.so.1
FFFFFFFF7CAA8000 56K rwx-- /usr/lib/sparcv9/libnsl.so.1
FFFFFFFF7CAB6000 40K rwx-- /usr/lib/sparcv9/libnsl.so.1
FFFFFFFF7CB00000 8K rwx-- [ anon ]
FFFFFFFF7CC00000 8K r-x-- /usr/lib/sparcv9/libkstat.so.1
FFFFFFFF7CD02000 8K rwx-- /usr/lib/sparcv9/libkstat.so.1
FFFFFFFF7CE00000 2184K r-x-- /oracle/product/10.2.0.4.4/lib/libnnz10.so
FFFFFFFF7D120000 240K rwx-- /oracle/product/10.2.0.4.4/lib/libnnz10.so
FFFFFFFF7D15C000 8K rwx-- /oracle/product/10.2.0.4.4/lib/libnnz10.so
FFFFFFFF7D200000 72K r-x-- /oracle/product/10.2.0.4.4/lib/libdbcfg10.so
FFFFFFFF7D310000 8K rwx-- /oracle/product/10.2.0.4.4/lib/libdbcfg10.so
FFFFFFFF7D400000 1072K r-x-- /oracle/product/10.2.0.4.4/lib/libclsra10.so
FFFFFFFF7D60A000 56K rwx-- /oracle/product/10.2.0.4.4/lib/libclsra10.so
FFFFFFFF7D618000 8K rwx-- /oracle/product/10.2.0.4.4/lib/libclsra10.so
FFFFFFFF7D700000 8K rwx-- [ anon ]
FFFFFFFF7D800000 9272K r-x-- /oracle/product/10.2.0.4.4/lib/libjox10.so
FFFFFFFF7E20C000 560K rwx-- /oracle/product/10.2.0.4.4/lib/libjox10.so
FFFFFFFF7E300000 1072K r-x-- /oracle/product/10.2.0.4.4/lib/libocrutl10.so
FFFFFFFF7E50A000 56K rwx-- /oracle/product/10.2.0.4.4/lib/libocrutl10.so
FFFFFFFF7E518000 8K rwx-- /oracle/product/10.2.0.4.4/lib/libocrutl10.so
FFFFFFFF7E600000 1376K r-x-- /oracle/product/10.2.0.4.4/lib/libocrb10.so
FFFFFFFF7E856000 64K rwx-- /oracle/product/10.2.0.4.4/lib/libocrb10.so
FFFFFFFF7E866000 8K rwx-- /oracle/product/10.2.0.4.4/lib/libocrb10.so
FFFFFFFF7E900000 1536K r-x-- /oracle/product/10.2.0.4.4/lib/libocr10.so
FFFFFFFF7EB7E000 64K rwx-- /oracle/product/10.2.0.4.4/lib/libocr10.so
FFFFFFFF7EB8E000 8K rwx-- /oracle/product/10.2.0.4.4/lib/libocr10.so
FFFFFFFF7EC00000 8K rwx-- [ anon ]
FFFFFFFF7ED00000 8K r-x-- /oracle/product/10.2.0.4.4/lib/libskgxn2.so
FFFFFFFF7EE00000 8K rwx-- /oracle/product/10.2.0.4.4/lib/libskgxn2.so
FFFFFFFF7EF00000 1752K r-x-- /oracle/product/10.2.0.4.4/lib/libhasgen10.so
FFFFFFFF7F1B4000 72K rwx-- /oracle/product/10.2.0.4.4/lib/libhasgen10.so
FFFFFFFF7F1C6000 16K rwx-- /oracle/product/10.2.0.4.4/lib/libhasgen10.so
FFFFFFFF7F200000 144K r-x-- /oracle/product/10.2.0.4.4/lib/libskgxp10.so
FFFFFFFF7F322000 16K rwx-- /oracle/product/10.2.0.4.4/lib/libskgxp10.so
FFFFFFFF7F400000 8K r-x-- /usr/platform/sun4u-us3/lib/sparcv9/libc_psr.so.1
FFFFFFFF7F500000 8K rwx-- [ anon ]
FFFFFFFF7F600000 184K r-x-- /usr/lib/sparcv9/ld.so.1
FFFFFFFF7F72E000 16K rwx-- /usr/lib/sparcv9/ld.so.1
FFFFFFFF7FFDC000 144K rw--- [ stack ]
total 8511704K

834881 wrote:
I have a 4 node RAC cluster running Linux RHEL3. I know .. would love to upgrade it .. but that will take time. Looking for at survival at this point. The system is experiencing High I/O wait. How/why do you relate this to a memory problem that needs memory utilisation analysed?
It could be that you have a dual fibre via HBA to the SAN and that one port is faulty (e.g. bad cable), thus reducing your I/O to the SAN to a single I/O path.
It could be caused by hotspots on a LUN - and likely because ASM is not being used, this hotspot cannot be automatically load balanced.
Or it could be a number of other factors, such as poorly designed and written app code that performs multiple passes through the same data sets, abuse of PQ slaves, etc.
How does your storage layer look? What do you use for SAN connectivity? What diver s/w is used? How are the LUNs used (cooked/raw)? Is ASM used? What does Oracle session and instance reports ito I/O wait times? Which datafiles are being hit the hardest? Is acrhive logging used and what is the frequency of log switches? Etc. etc.
Memory utilisation does not impact I/O, unless it is swap I/O. And these symptoms are easily seen and easily diagnosed. So I would expect that high memory utilisation may be a symptom, as is I/O wait times, of a potential underlying problem. But it would be premature to blame one (e.g. I/O wait times) on the other (e.g. memory utilisation).

Memory Management Questions

Hello All!
I read the Memory Management Programming Guide for Cocoa - several times. But some things are still not really clear.. I would like and need to have a deeper understanding. So, I hope someone could help me The problem is that I had to get rid of several (..) memory leaks in my app, and now I am a bit confused and unsure about my skills at all..
1.
What is the difference between sayHello1,sayHello2,getHello1,getHello2,getHello3 and which one is "better" (and why) - please dont try to interprete the logic/sense of the methods itself
- (NSString *) sayHello1{
return [[[NSString alloc] initWithString:@"Hello"] autorelease];
- (NSString *) sayHello2{
return [[[NSString alloc] initWithString:@"Hello"] retain];
- (void) getHello1{
NSString *hello = [self sayHello1];
[hello release];
- (void) getHello2{
NSString *hello = [self sayHello2];
[hello release];
- (void) getHello3:(NSString *)hello{
[hello retain];
NSLog(@"%@", hello);
[hello release];
Concerning this, there are several questions:
2.
If I have to release everything I retain/alloc, why then do I have a memory leak, if am returning an object (which was allocated with alloc and init) from a method without autorelease. The object is still in memory. But the following method wont work. What I accept. But the object is, if returned, not reachable, but also not released. Why then is it not automatically released? (i dont mean autorelease)
- (NSString *) sayHello1{
return [[NSString alloc] initWithString:@"Hello"]];
- (void) getHello{
NSString *hello = [self sayHello1]; //wont work. the object is not there, but also not released. WHERE is it?
[hello release];
3.
When is a delegate method released, if I have no variable I can use to "release"? So, if I have nothing to access the delegate like a NSURLConnection delegate?
should I, for example, call a [self release]?
- (void)startParser{
Parser *parser = [[Parser alloc] init];
[parser start];
//should I use a [parser autorelease or retain] here?
- (void)parserDidEndDocument:(NSXMLParser *)parser{
//do somethings with the parserstuff
[self release];
4.
*And the last question:*
Where can I see in instruments, which elements have retain counts > 1 and potential leaks? I was reading the instruments guide but there is only theoretical stuff. No practical guides like: your app should not have/use more than x megabyte ram.. for example: my app gets slower and slower the longer a i use it. -> this indicates memory leaks..

A Leak is only a leak if the reference to the object is lost.
https://devforums.apple.com/message/189661#189661

Solaris Memory Allocation Questions

Hi,
I am a Columbia University engineering graduate student doing research on Solaris 10 Operating System. I just have 3 quick questions that I was unable to find answers for on the Sun Documentation website. If any1 can help me answer these questions or point me to resources that do I would really appreciate it. The questions are as follows.
1. Does Solaris 10 provide developers with methods to ask for memory that only programs running with a certain security key or privilege can access?
2. Also, can develops ask for private memory? I understand that during write on shared memories, copy-on-write will generate a copy of the shared memory page and make that private to the process but I am not sure if there are ways to allocate private memory at the beginning.
3. Does Solaris 10 provide developers with methods to ask for memory that is fixed in memory and not pageable? I understand that by asking for ISM then the pages are locked in memory. But I was wondering if there are methods that an application can call that does this without having to share memory.
Thanks,
Larry Chen

larrychen wrote:
1. Does Solaris 10 provide developers with methods to ask for memory that only programs running with a certain security key or privilege can access? Solaris 10 changed everything to be based on process privileges (see the output of "ppriv -vp" for a list). It's not clear to me on a brief inspection which limits access to a processes address space but that is the mechanism.
2. Also, can develops ask for private memory? I understand that during write on shared memories, copy-on-write will generate a copy of the shared memory page and make that private to the process but I am not sure if there are ways to allocate private memory at the beginning.Anytime you allocate heap space (eg. a call to "malloc") you get private memory. Well, technically you get it as soon as you reference it -- the call to malloc just generates the mappings, the page fault when you access it instantiates the page in RAM.
3. Does Solaris 10 provide developers with methods to ask for memory that is fixed in memory and not pageable? I understand that by asking for ISM then the pages are locked in memory. But I was wondering if there are methods that an application can call that does this without having to share memory.Yes. First you must have the process privilege of "proc_lock_memory". After that you can call "mlock"

Importance of Memory Pairing Questions.

I recently bought a 2.2ghz macbook, and left it with the 1gb of memory to keep cost to a minimum. I knew I was going to upgrade later down the line, but for much cheaper then what apple wanted to charge me. So, here I am looking at my choices. I know i want to in the end, end up with 4gb of memory, so what I am asking is what is my best choice when trying to save money.
A: Just buy a 2gb kit (2x1gb) and wait until 4gb kits are cheaper.
B: Buy a 2gb stick, and wait until another 2gb stick is cheaper.
C: Buy 2gb sticks that aren't too much money (not a kit)
D: Just get a 4gb kit.
My real question is what's the difference if any, between a 4gb kit, and 2; 2gb sticks (sold separetly)
thanks.

raertadte wrote:
I recently bought a 2.2ghz macbook, and left it with the 1gb of memory to keep cost to a minimum. I knew I was going to upgrade later down the line, but for much cheaper then what apple wanted to charge me. So, here I am looking at my choices. I know i want to in the end, end up with 4gb of memory, so what I am asking is what is my best choice when trying to save money.
A: Just buy a 2gb kit (2x1gb) and wait until 4gb kits are cheaper.
B: Buy a 2gb stick, and wait until another 2gb stick is cheaper.
C: Buy 2gb sticks that aren't too much money (not a kit)
D: Just get a 4gb kit.
My real question is what's the difference if any, between a 4gb kit, and 2; 2gb sticks (sold separetly)
Getting build-to-order memory isn't anywhere near cost effective, so you were probably better of not doing it. The correct memory kits for the MacBook are anywhere from under $50 for 2GB to under $100 for 4GB. Most people can capably do it themselves with a $4 #00 Philips screwdriver.
There theoretically shouldn't be any real difference with two single 2GB should you buy them at the same time and they come from the same lot. However - you always run the chance that each module may be slightly different even if you buy them at the same time. Some brands use different memory suppliers and can change the individual ICs and/or module design. Sometimes there's different revision information. Nobody I know of has found a surefire way to ensure that the memory controller recognizes the memory as a matched pair (to achieve dual channel) short of buying a pair that is guaranteed to be identical.
The alleged benefit of a "matched pair" or "dual channel" memory kits is that they are guaranteed to be the same, down to the exact same information in the serial presence detect EEPROM on the modules. Another benefit is that they are typically warrantied together. If one module fails, the seller will likely replace the entire pair with another matched set. The replacements that are available might not be exactly the same as the original.
Dual channel would mean that both pairs are accessed in parallel, and should theoretically mean higher performance. I don't think it's really the bottleneck, but apparently it results in slightly higher video performance with the integrated video that uses a segment of the system memory.

Update on Memory, plus Question

I have decided to go for 2 x 256mb 400mhz DDR DIMMs, plus 1x 512mb DDR 400mhz.
After reading all of the posts here, I am now more confused than ever.
I'm going to place my order for them on Feb 1st.
What I would like Tiresmoke, or anyone else to do is to answer two questions.
Firstly, will this combo work??
Secondly, where to put the new sticks(ie which Dimms).
Finally, the Bios matter...just how is that done??????
If this matter could be answered as soon as possible, I would be really grateful.

The advise already given Memory Upgrade. seems sound.
Quote
2 x 256mb 400mhz DDR DIMMs, plus 1x 512mb DDR 400mhz
is not a good configuration for your mobo
See Main Memory
Quote
Firstly, will this combo work??
- Doubt it
Quote
Finally, the Bios matter...just how is that done??????
- See manual - Cell Menu P58 or Section 3-23
In the Dram configuration The Memory Timings Auto settings are read from the spd chip on the memory module. These are the manf recomended settings but sometimes need to be set manually:-
1)Like some corsair brands which need different settings to run on the AMD64
2) Where modules with different timings are used.

Memory Timinigs Question?

I have two sticks of 512 Corsair. One is LL and the other is XLL. I have the volts at 2.7 and they are in slots 1&2. If I leave the timings on auto I get random Blue Screens of Death. If i raise them to 2.5-3-11-3 everything seems stable (I ran Prime 95 over night and 3Dmark 01 at the same time. Memtest tonghit).
So my questions is:
1. Is this normal?
2. I'm at T2 right now. Is T1 generally more unstable?
3. When I run MemTest, how long do I run it for?
4. Anything else I should try? I've heard that placing the memory in slots 1&3 is better. is this true?

As youve got 2 different models the timings on the spd (the control chip on each module) will i suspect have different timings. The spd settings are used when selection is set on auto. Therefore you get glitches.
by overiding auto with 2.5-3-11-3 you have selected a timing that both modules can run at.
if you want to compare modules try each module on auto & view settings using Everest or CPUID, logically both should run at the speed of the slowest module.
It's a nice exercise youv'e done & dispels the theory some have that these mobos need matched pairs.

Memory riser question

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