On 16 Apr 2013, at 06:35, Techienote com <techienote....@gmail.com> wrote:
> Hi Team, > > Recently I am seeing concurrent mode failure errors in my Verbose GC logs. > For the same I have set NewSize to 512MB, still I am seeing concurrent mode > failure in the Verbose GC logs Where have you set these JVM attributes and how are you starting Tomcat? Is the log below from after you set NewSize to 512 or before? It doesn't look like it is set to me. What does your app do? When did this start happening, was it after a specific app update? Have you observed load increasing due to user activity? p > 62230.611: [ParNew (promotion failed) > Desired survivor size 32768 bytes, new threshold 0 (max 0) > : 28481K->28481K(28608K), 0.0483728 secs]62230.659: [CMS (concurrent mode > failure) > > Also Garbage collection is causing some large pauses. The largest pause was > 121239 ms. > > : 1255376K->215461K(2068480K), 121.1880176 secs] > 1283830K->215461K(2097088K)Heap after gc invocations=12320: > par new generation total 28608K, used 0K [0x68800000, 0x6a400000, > 0x6a400000) > eden space 28544K, 0% used [0x68800000, 0x68800000, 0x6a3e0000) > from space 64K, 0% used [0x6a3e0000, 0x6a3e0000, 0x6a3f0000) > to space 64K, 0% used [0x6a3f0000, 0x6a3f0000, 0x6a400000) > concurrent mark-sweep generation total 2068480K, used 215461K [0x6a400000, > 0xe8800000, 0xe8800000) > concurrent-mark-sweep perm gen total 88496K, used 55091K [0xe8800000, > 0xede6c000, 0xf8800000) > } > , 121.2390524 secs] > > Following is my JVM argument > -server -verbose:gc -Xmx2048m -Xms2048m -XX:NewSize=512m > -XX:MaxNewSize=512m -XX:MaxPermSize=256M -XX:+UseConcMarkSweepGC > -XX:+UseParNewGC -XX:+CMSParallelRemarkEnabled > -Dsun.rmi.dgc.client.gcInterval=3600000 > -Dsun.rmi.dgc.server.gcInterval=3600000 -XX:+DisableExplicitGC > -XX:+HeapDumpOnOutOfMemoryError -XX:+HeapDumpOnCtrlBreak > -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+PrintClassHistogram > -XX:+PrintGCDetails -XX:+PrintTenuringDistribution > > Tomcat Version > 6.0.36 > > JDK Version > Sun HotSpot 1.5.0.22 > > CPU > Number of Physical processor 1 > Number of Virtual processor 7 > > RAM > 6144MB > > OS > SunOS 5.10 Generic_147440-09 sun4v sparc sun4v > > Do you have any idea how to tune it further? > > > > Regards, > > Vidyadhar --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
