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Sreeraj AV
setting JVM heap size in 64bit JVM
2012/07/12 6:56
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Sreeraj AV

ランク: Regular Member

投稿: 236

参加年月日: 2010/04/26

最近の投稿

Below is the system details. This server is dedicated to Liferay portal. I need to change the JVM heap size. Can anyone please tell me what is the optimal heap size i can provide for this particular JVM?

Processor: Intel(R) Xeon(R) CPU E5645 @ 2.40GHz , dual core- 64bit
Memory : 6GB
OS : Linux 64bit
Java : java version "1.6.0_21-ea" 64bit
Sagar A Vyas
RE: setting JVM heap size
2012/07/12 3:14
答え

Sagar A Vyas

ランク: Liferay Master

投稿: 659

参加年月日: 2009/04/17

最近の投稿

Sreeraj AV:
Below is the system details. This server is dedicated to Liferay portal. I need to change the JVM heap size. Can anyone please tell me what is the optimal heap size i can provide for this particular JVM?

Processor: Intel(R) Xeon(R) CPU E5645 @ 2.40GHz , dual core- 64bit
Memory : 6GB
OS : Linux 64bit
Java : java version "1.6.0_21-ea" 64bit


Hi Sreeraj,

You can edit setenv.sh located in "tomcat-New\tomcat-6.0.32\bin"

-Xmx1024m -XX:MaxPermSize=256m" change it to -Xmx1024m -XX:MaxPermSize=512m"

Hope this help.

Thanks,
Sagar Vyas
Chintan Akhani
RE: setting JVM heap size
2012/07/12 4:46
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Chintan Akhani

ランク: Regular Member

投稿: 111

参加年月日: 2008/03/13

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As you have 6 GB memory allocated for liferay instance only, so you can increase heap size upto 4 GB.
Sreeraj AV
RE: setting JVM heap size
2012/07/12 6:55
答え

Sreeraj AV

ランク: Regular Member

投稿: 236

参加年月日: 2010/04/26

最近の投稿

Chintan Akhani:
As you have 6 GB memory allocated for liferay instance only, so you can increase heap size upto 4 GB.




Thanks for your reply. How you are telling 4GB? is there any procedure or best practices to determine the heap size value? Can you please explain..
Linus Sphinx
RE: setting JVM heap size
2012/07/12 11:31
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Linus Sphinx

ランク: Junior Member

投稿: 89

参加年月日: 2010/08/12

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I use apache bench or http_load if non-ssl to simulate a bunch of users banging on the site while monitoring the memory usage in jvisualvm remotely and adjust accordingly til I get the behavior desired.
Given your hardware I'd assume you'll need some resources for other apps like backup etc. and recommend for a starting point a setenv.sh of;
1JAVA_OPTS="$JAVA_OPTS -XX:NewSize=700m -XX:MaxNewSize=700m -Xms2560m -Xmx2560m -XX:MaxPermSize=512m -Dfile.encoding=UTF8 -Duser.timezone=GMT -Dorg.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES=false -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio=20 -XX: ParallelGCThreads=8"

concatenate this to the above string to enable JMX;
1 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=33100
Mika Koivisto
RE: setting JVM heap size in 64bit JVM
2012/07/12 14:04
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Mika Koivisto

LIFERAY STAFF

ランク: Liferay Legend

投稿: 1513

参加年月日: 2006/08/07

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Heap is not absolute amount of memory your java process will take. There's several factors and I've quite recently explained them in my blog post: Why is my java process taking more memory than I gave it?
Mika Koivisto
RE: setting JVM heap size in 64bit JVM
2012/07/12 14:07
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Mika Koivisto

LIFERAY STAFF

ランク: Liferay Legend

投稿: 1513

参加年月日: 2006/08/07

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The maximum heap certainly isn't 4GB on a 64bit system. You can increase it well beyond that but doing so may adversely affect the performance of the application because of longer full garbage collection times.
Sagar A Vyas
RE: setting JVM heap size in 64bit JVM
2012/07/13 0:39
答え

Sagar A Vyas

ランク: Liferay Master

投稿: 659

参加年月日: 2009/04/17

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Hi Mika,

Good Sharing,
@Sreeraj : you can follow given formula.
(-Xmx) + (-XX:MaxPermSize) + numberofthreads * (-Xss) + Other mem

Thanks,
Sagar Vyas
Linus Sphinx
RE: setting JVM heap size in 64bit JVM
2012/07/13 8:58
答え

Linus Sphinx

ランク: Junior Member

投稿: 89

参加年月日: 2010/08/12

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Mika Koivisto:
The maximum heap certainly isn't 4GB on a 64bit system. You can increase it well beyond that but doing so may adversely affect the performance of the application because of longer full garbage collection times.

Must have been thinking 32 bit, thank you. GC is also tunable.
1-XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio=20 -XX: ParallelGCThreads=8
Sreeraj AV
RE: setting JVM heap size in 64bit JVM
2012/07/18 0:19
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Sreeraj AV

ランク: Regular Member

投稿: 236

参加年月日: 2010/04/26

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Thanks Mika..

Mika Koivisto:
Heap is not absolute amount of memory your java process will take. There's several factors and I've quite recently explained them in my blog post: Why is my java process taking more memory than I gave it?