Re: Centos 5 OS not releasing memory Tomcat6
Here's the /etc/sysctl.conf parameters that I've started with: vm.dirty_writeback_centisecs = 100 vm.dirty_expire_centisecs = 100 vm.pagecache = 1 10 30 Since this server is taking Production traffic, we'll need to what for a window to test this. I'll let you know how it works out. If the two vm.dirty don't correct it I'll take it down to 0 for I believe the CPU's will be able to handle the extra cycles. Regards, Marc Maurizio Rottin wrote: 2009/5/28 André Warnier a...@ice-sa.com: If a non-existent process is able to hold on to some memory and not return it to the OS, doesn't that indicate an OS problem ? i think so! but i do not remeber any kernel problem related to memory caching in Centos kernel releases. Maybe you should give a try at Centos 5.3 kernels. -- mr - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- View this message in context: http://www.nabble.com/Centos-5-OS-not-releasing-memory-Tomcat6-tp23761076p23780151.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Centos 5 OS not releasing memory Tomcat6
Tomcat version 6 Apache 2.2.3 Centos 5.2 VMware 2.5 2 VPU's 4G Memory Guest Memory usage is on a avg 122 MB and Host Memory is at 3.31 G so we know it's not the balloon driver. Problem statement: I understand as a SysAdmin that the JVM loves to grab all the memory resources as it can, sort of like Oracle. However when we stop and then attempt to restart Tomcat it fails and the server needs to be restarted. Also it seems that this memory is being held in the Linux Cache system and to release it we run the following: echo 3 /proc/sys/vm/drop_caches I guess my question is there a tuneable on either the OS or in the JVM that will give me the same result? Let me know any more information I need to provide. Thanks, Marc Sweeney -- View this message in context: http://www.nabble.com/Centos-5-OS-not-releasing-memory-Tomcat6-tp23761076p23761076.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Centos 5 OS not releasing memory Tomcat6
Hi, Thank you for your reply. Yes we did a custom install on Tomcat6. No there wasn't any java processes running when we stopped Tomcat, so it appears from the OS level to be shutting down, but it's not releasing the memory space back to the OS. running the free command after stopping Tomcat shows all the memory still being held: # free total used free sharedbuffers cached Mem: 39218843326672 595212 0 3170441528544 -/+ buffers/cache:14810842440800 Swap: 2048152 3162441731908 What I'm doing now is looking into the sysctl.conf parameters that will flush the cache, sort of like Oracle. Regards, Marc Sweeney Maurizio Rottin wrote: 2009/5/28 msweeney whiterockbi...@gmail.com: Tomcat version 6 Apache 2.2.3 Centos 5.2 VMware 2.5 2 VPU's 4G Memory Guest Memory usage is on a avg 122 MB and Host Memory is at 3.31 G so we know it's not the balloon driver. Problem statement: I understand as a SysAdmin that the JVM loves to grab all the memory resources as it can, sort of like Oracle. However when we stop and then attempt to restart Tomcat it fails and the server needs to be restarted. Also it seems that this memory is being held in the Linux Cache system and to release it we run the following: echo 3 /proc/sys/vm/drop_caches tomcat6 is not included in Centos, then i assume you take source file from apache tomcat website. If this is the case, when you stop tomcat, then you have to kill the process. try a ps -ef | grep j and you will probably see that java is still running. if you are succesful in killing the process, then try to start tomcat. -- mr - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- View this message in context: http://www.nabble.com/Centos-5-OS-not-releasing-memory-Tomcat6-tp23761076p23769904.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
