Suchit Khobarekar
2013-01-31 15:06:17 UTC
Suchit Khobarekar [https://community.jboss.org/people/SuchitKhobarekar] created the discussion
"Servers swapping memory"
To view the discussion, visit: https://community.jboss.org/message/795421#795421
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Hi,
We have configured Liferay servers on JBoss AS 7.1.1. We have two environments Stage and Prod which are pretty much identical in terms of the hardware and software. However we are seeing some heavy swapping happening on the Prod servers. About a few hours after the servers are started they start swapping memory and this is how it read (as below):
Memory             Used         Total     Percentage
============================
Physical          4079M      7872M         51%
Actual               3630M      7872M         46%
Swap                   878M  2047M         42%
This is not a good sign for us. The JAVA_OPTS setting in standalone.conf is as below
JAVA_OPTS="$JAVA_OPTS -Dfile.encoding=UTF-8 -Djava.net.preferIPv4Stack=true -Duser.timezone=GMT -server -XX:NewSize=700m -XX:MaxNewSize=700m -Xms2048m -Xmx4096m -XX:MaxPermSize=1536m -XX:SurvivorRatio=6 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=15 -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:ParallelGCThreads=16 -XX:+CMSCompactWhenClearAllSoftRefs -XX:CMSInitiatingOccupancyFraction=85 -XX:+CMSScavengeBeforeRemark -XX:+CMSConcurrentMTEnabled -XX:ParallelCMSThreads=2"
There are 2 nodes with 8 GB of RAM each
I found a thread which mentioned that the -Xms and -Xmx should ideally have the same values. This is the thread https://community.jboss.org/message/221207#221207 https://community.jboss.org/message/221207
Any help on this is really appreciated. I
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"Servers swapping memory"
To view the discussion, visit: https://community.jboss.org/message/795421#795421
--------------------------------------------------------------
Hi,
We have configured Liferay servers on JBoss AS 7.1.1. We have two environments Stage and Prod which are pretty much identical in terms of the hardware and software. However we are seeing some heavy swapping happening on the Prod servers. About a few hours after the servers are started they start swapping memory and this is how it read (as below):
Memory             Used         Total     Percentage
============================
Physical          4079M      7872M         51%
Actual               3630M      7872M         46%
Swap                   878M  2047M         42%
This is not a good sign for us. The JAVA_OPTS setting in standalone.conf is as below
JAVA_OPTS="$JAVA_OPTS -Dfile.encoding=UTF-8 -Djava.net.preferIPv4Stack=true -Duser.timezone=GMT -server -XX:NewSize=700m -XX:MaxNewSize=700m -Xms2048m -Xmx4096m -XX:MaxPermSize=1536m -XX:SurvivorRatio=6 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=15 -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:ParallelGCThreads=16 -XX:+CMSCompactWhenClearAllSoftRefs -XX:CMSInitiatingOccupancyFraction=85 -XX:+CMSScavengeBeforeRemark -XX:+CMSConcurrentMTEnabled -XX:ParallelCMSThreads=2"
There are 2 nodes with 8 GB of RAM each
I found a thread which mentioned that the -Xms and -Xmx should ideally have the same values. This is the thread https://community.jboss.org/message/221207#221207 https://community.jboss.org/message/221207
Any help on this is really appreciated. I
--------------------------------------------------------------
Reply to this message by going to Community
[https://community.jboss.org/message/795421#795421]
Start a new discussion in Performance Tuning at Community
[https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2078]