Settings for young generation collector ignored

I am trying to play with GC settings to optimise performance of a Java server. It looks like when I turn on the concurrent old generation collector with -XX:+UseConcMarkSweepGC, the JVM starts to ignore my settings for young generation collector, like survivor ratio and tenuring threshold. According to the output of -XX:+PrintTenuringDistribution, my tenuring threshold is always zero, and the size of the survivor spaces is always 32K.
Please advise, how can I change the settings of the young generation collector and continue using the concurrent old generation collector. Or is this a known bug that has been fixed in one of the latest releases? My JVM version is 1.4.2_04-b05, OS is Solaris9.

Dion,
The promotional failure would have been the case had my Tenured Generation been full. I am using a concurrent mark sweep that would be initiated as soon as the tenured generation reached 65%. There is no way that promotional failure could be the reason . Even if it was ....as you note my young generation is really small. Full compaction would'nt take that much time even if it was a promotional failure. In fact I am by setting the MaxTenuringThreshhold to 0 to ensure a promote all behavior in the Young Generation.
It has got to be something to do with TLAB . Could someone answer if UseTLAB is true by default in windows or you need to switch it on. Also I am using JDK1.4.2_04. Would it allow me to use TLAB. I read somewhere that TLAB implementation was a little buggy till 1.4.2_10 came around. What is the driving factor to set TLABRatio or Size

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jdk: 1.4.2_06
jvm parameters:
-Xms2560m -Xmx2560m -XX:NewSize=32M -XX:MaxPermSize=256M -XX:+DisableExplicitGC -XX:+UseConcMarkSweepGC
-XX:+UseParNewGC -
nature of our application is that most of the new objects which are cretaed most likely is going to end up in tenured space so we have kept newsize small.
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1892801.223: [ParNew 1307000K->1276979K(2621376K), 0.0405279 secs]
1892803.702: [ParNew 1309619K->1280021K(2621376K), 0.0381812 secs]
1892810.257: [ParNew 1312661K->1282979K(2621376K), 0.0430851 secs]
1892813.616: [ParNew 1315619K->1285174K(2621376K), 0.0353861 secs]
1892820.838: [ParNew 1317814K->1287959K(2621376K), 0.0391169 secs]
1892825.486: [ParNew 1320599K->1294498K(2621376K), 0.1225365 secs]
1892825.883: [ParNew 1327138K->1309838K(2621376K), 0.4025240 secs]
1892832.756: [ParNew 1342478K->1315852K(2621376K), 0.1057747 secs]
1892838.118: [ParNew 1348492K->1317861K(2621376K), 0.0320176 secs]
1892843.932: [ParNew 1350501K->1319480K(2621376K), 0.0383975 secs]
but one or twice in a day it start taking higher gc time for new generation for 2-3 minute till gc happens for old generation
311536.095: [ParNew 1583769K->1556941K(2621376K), 0.2767211 secs]
311536.768: [ParNew 1659394K->1638895K(2621376K), 0.5441500 secs]
311537.638: [ParNew 1671535K->1650538K(2621376K), 0.4639280 secs]
311538.849: [ParNew 1683178K->1652904K(2621376K), 0.4405431 secs]
311540.088: [ParNew 1685544K->1659556K(2621376K), 0.4570603 secs]
311545.027: [ParNew 1692196K->1661921K(2621376K), 0.4514625 secs]
311547.213: [ParNew 1694561K->1664354K(2621376K), 0.4518378 secs]
311553.699: [ParNew 1696994K->1666712K(2621376K), 0.4341839 secs]
311556.270: [ParNew 1699352K->1668499K(2621376K), 0.4293822 secs]
311559.200: [ParNew 1701139K->1670185K(2621376K), 0.4406644 secs]
311562.732: [ParNew 1702825K->1672748K(2621376K), 0.4399115 secs]
311563.772: [ParNew 1705388K->1674850K(2621376K), 0.4561811 secs]
311568.178: [ParNew 1707490K->1677631K(2621376K), 0.4509551 secs]
311569.400: [ParNew 171027
We rarely have Full GC. Mostly minor GC of 2-3 seconds. Once minor GC happens , new generation comes back to .04 sec from .5 sec
311660.144: [ParNew 1789014K->1758802K(2621376K), 0.4462287 secs]
311662.122: [ParNew 1791442K->1762257K(2621376K), 0.4457078 secs]
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311666.224: [GC 1771006K(2621376K), 1.6403867 secs]
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311672.790: [ParNew 1357566K->1327406K(2621376K), 0.5134905 secs]
311673.748: [ParNew 1328011K->1303516K(2621376K), 0.4523868 secs]
311675.227: [ParNew 1239373K->1212039K(2621376K), 0.4482543 secs]
311677.571: [ParNew 1037272K->1006895K(2621376K), 0.4341042 secs]
311681.144: [ParNew 584941K->554178K(2621376K), 0.0314600 secs]
311682.233: [ParNew 586818K->557176K(2621376K), 0.0409105 secs]
311683.170: [ParNew 589816K->563481K(2621376K), 0.0589575 secs]
311686.489: [ParNew 596121K->565244K(2621376K), 0.0335869 secs]
311689.309: [ParNew 597884K->567601K(2621376K), 0.0351472 secs]
To me it looks like our old generation is fragmented and promotion from new generation to old generation start taking longer time. But once Minor GC happens an dfree up spaces from old generation then we longer sees pauses of .5 seconds every 1 seconds
I am thinking to increase newsize as well as use following
UseCMSCompactAtFullCollection
-XX:CMSFullGCsBeforeCompaction=0
-XX:-CMSParallelRemarkEnabled
we haven't used these earlier becasue we thought these are default to these in 1.4.2
any other suggestion?
how we can prevent fragmentaion of old space. full gc can adjsu old space but in our case we don't have many full gc's.

As tschodt indicated, increasing the NewSize as well as
SurvivorRatio and MaxTenuringThreshold so as to reduce
the promotion rate into the old generation might help.
To see if it helps you can use -XX:+PrintTenuringDistribution to
see if aging objects in the survivor spaces stems the
tenuring rate substantially or not.
You may also consider manually setting the CMSInitiatingOccupancyFraction
parameter so as to trigger a CMS old generation collection cycle
sooner than is the case currently.
Finally, consider moving to a newer version of the JDK. In particular
1.5.0_09 (or later) or 1.6.0 (or later) have substantially improved both
the performance, scalability and "autonomicity" of the concurrent
collector quite substantially.

Why would a Young Generation Collection take 8 seconds??

What does gen0t(s) mean. I am using the following GC settings
-Xms1024m -Xmx1024m -XX:PermSize=128m -XX:MaxPermSize=128m -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSParallelRemarkEnabled -XX:CMSInitiatingOccupancyFraction=65 -XX:MaxTenuringThreshold=0 -XX:SurvivorRatio=128 -XX:+PrintGCDetailsI am aiming for minimum pause time as thats what my application dictates. When I run the PrintGCStats tool this is the output I get
what         count       total      mean      max   stddev
gen0(s)      18467     496.518   0.02689    0.383   0.0175
gen0t(s)     18467     511.923   0.02772    8.845   0.0672
cmsIM(s)        63       1.872   0.02971    0.040   0.0038
cmsRM(s)        63      15.047   0.23885    0.542   0.0753
GC(s)        18530     528.843   0.02854    8.845   0.0683
cmsCM(s)        63     144.044   2.28641    2.774   0.2244
cmsCP(s)        63       0.000   0.00000    0.000   0.0000
cmsCS(s)        63     157.729   2.50363    4.957   0.4872
cmsCR(s)        63       4.622   0.07337    0.087   0.0061
alloc(MB)    18467 293049.334 15.86881   15.875   0.1191
promo(MB)    18466   25500.123   1.38092   11.232   1.0205
alloc/elapsed_time    = 293049.334 MB / 160832.477 s =   1.822 MB/s
alloc/tot_cpu_time    = 293049.334 MB / 643329.908 s =   0.456 MB/s
alloc/mut_cpu_time    = 293049.334 MB / 640908.142 s =   0.457 MB/s
promo/elapsed_time    = 25500.123 MB / 160832.477 s =   0.159 MB/s
promo/gc0_time        = 25500.123 MB /    511.923 s = 49.812 MB/s
gc_seq_load           =   2115.371 s / 643329.908 s =   0.329%
gc_conc_load          =    306.395 s / 643329.908 s =   0.048%
gc_tot_load           =   2421.766 s / 643329.908 s =   0.376%I am running this on JDK1.4.2Hotspot Windows version on a machine that has 4 processors. Please any help would be greatly appreciated. If this has got something to do be gc_epilogue ,gc_prologue and TLAB settings , could you guide me in the right direction.? Is the -XX:+UseTLAB option true for Windows by default?
Edited by: Shivreet on Nov 28, 2007 3:22 PM

Dion,
The promotional failure would have been the case had my Tenured Generation been full. I am using a concurrent mark sweep that would be initiated as soon as the tenured generation reached 65%. There is no way that promotional failure could be the reason . Even if it was ....as you note my young generation is really small. Full compaction would'nt take that much time even if it was a promotional failure. In fact I am by setting the MaxTenuringThreshhold to 0 to ensure a promote all behavior in the Young Generation.
It has got to be something to do with TLAB . Could someone answer if UseTLAB is true by default in windows or you need to switch it on. Also I am using JDK1.4.2_04. Would it allow me to use TLAB. I read somewhere that TLAB implementation was a little buggy till 1.4.2_10 came around. What is the driving factor to set TLABRatio or Size

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Message was edited by: Winston Churchill

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hI
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Chris,
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I am using H264 (settings below).
Can anyone confirm that these settings are the best possible to use to get the highest quality, or suggest something else?
File Extension: mov
Estimated file size: unknown
Audio Encoder
IMA 4:1, Stereo (L R), 48.000 kHz
Video Encoder
Format: QT
Width: 720
Height: 480
Pixel aspect ratio: NTSC CCIR 601/DV
Crop: None
Padding: None
Frame rate: (100% of source)
Frame Controls On:
Retiming: (Better) Motion Compensated
Resize Filter: Linear Filter
Deinterlace Filter: Better (Motion Adaptive)
Adaptive Details: On
Antialias: 0
Detail Level: 0
Field Output: Progressive
Codec Type: H.264
Multi-pass: On, frame reorder: On
Pixel depth: 24
Spatial quality: 100
Min. Spatial quality: 25
Key frame interval: 24
Temporal quality: 50
Min. temporal quality: 25

Looks pretty good to me. Have you read this article before? http://www.apple.com/quicktime/tutorials/h264.html
You know Flash Player 9 supports H.264? No need to re-encode to flv, if you can avoid it. Depends if you want to support earlier versions of Flash Player.
I would strongly recommend doing some short tests before you start encoding everything. It will save you a lot of time doing some short 10-20 second tests (just set in/out points in the Compressor Preview window). I would maybe try setting the keyframe rate to Automatic too.
I see you have frame controls activated. If you would like to save time, you could try this tip (same principle): http://discussions.apple.com/message.jspa?messageID=7309534#7309534
Web compression is all about testing to find the optimal settings for best possible quality/filesize ratio.
If you want the final result to end up as the best quality flv file, I would recommend encoding directly from your source to flv. Going through a heavily compressed long-GOP format like H.264, before encoding to an other heavily compressed format is not a good idea. You would want your video to go through as few generations as possible to maintain quality.

Best Settings for N Only Network.

I am trying to create an N only network with an AirPort Extreme 802.11n router. What are the best settings to use? Here is what I currently have. Also, just bought a previous generation MacBook Pro (one right before the new glass screen ones, do I need to use the N enabler?).
802.11n only (5 ghz)
Channel: Automatic
Security: WPA2
Multicast Rate: 6 mbps
Use wide channels is selected.
Thank you.

I am trying to create an N only network with an AirPort Extreme 802.11n router. What are the best settings to use?
Are you looking for the best settings for speed or overall speed and security?
For speed:
o 802.11n only (5 GHz)
o Wide-channel enabled
o Channel: <Will depend if there are other 5 GHz Wi-Fis or interference nearby. In that case, you can choose a different channel by holding down the Option key before making the selection in the AirPort Utility.>
o Security: None
o Multicast Rate: This determines the minimum bandwidth that a device must achieve in order to connect to the router. To eliminate slower devices, use the highest value possible.
For speed & security:
The same settings as above with Security set to WPA2 Personal

Disable Privacy Settings for Local Application

Hi,
Is there a configuration / policy file that can be used on a
user's local machine to disable the privacy settings dialog that
pops up asking "Allow / Deny" for a Microphone?
Our application is distributed on the client from an
installer that must be run with administrative rights, I need to
find a way to disable this from showing since the user is
implicitly allowing us access to their microphone; after all the
software is developed specifically for audio recording.
Thank you,
- Justin

Chris,
We learned that the Privacy tab (in Settings) can be found under the Flash plug-in for Firefox, but only if Firefox is running under an administrator.
Unfortunately, we haven't had much luck with the mms.cfg file. The following was used in the mms.cfg file (placed in both the %WINDIR%\SysWow64\Macromed\Flash and %WINDIR%\System32\Macromed\Flash” directories):
AVHardwareDisable = 0
AVHardwareEnabledDomain = local
AVHardwareEnabledDomain = 127.0.0.1
AVHardwareEnabledDomain = localhost
AutoUpdateDisable = 1
The AVHardwareEnabledDomain settings seem to be getting ignored regardless of whether the user is a standard user or an administrator. I also checked to make sure it wasn't just a local problem by going to a website that uses a microphone (http://www.testden.com/accent-reduction/systemcheck.htm). Adding the requested domain to the list (AVHardwareEnabledDomain = train.act360.com) still didn't bypass the allow/deny dialog box.
We know that the mms.cfg file is being read because setting "AVHardwareDisable = 1" will result in no prompt and that section being greyed out in Global Settings. I saw a post that suggested this setting was required to even make the AVHardwareEnabledDomain work, but it seems to block the local entirely and still brings up the dialog query on the internet site.
Thanks,
Torrey

HT1494 hi....i cant continuously play my music with my ipod nano....i tried a lot with the settings for wake time but still it is pausing the music path.Please anybody help me with this issue

hi....i cant continuously play my music with my ipod nano....i tried a lot with the settings for wake time but still it is pausing the music path.Please anybody help me with this issue

Is this your problem?
iPod nano (6th generation): Music stops when display turns off
B-rock

Settings for young generation collector ignored

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