Hello guys,
We are having problems on a production system with very long "full GC"
times, as long as1200sec real time (!!!).
We are using Java 6 (stuck with CentOS 5.8 at this time) and Tomcat 7.0.64.
Xmx is 5G, Xms is 2G, and GC options are -XX:+UseConcMarkSweepGC
-XX:+CMSIncrementalMode
No other custom memory-related settings are in place.
Looking at the GC log, the last few Full-GC entries are:
1367.020: [Full GC 1367.020: [CMS: 1178831K->527456K(1926784K),
2.1117220 secs] 1250378K->527456K(2080128K), [CMS Perm :
169762K->56187K(169984K)] icms_dc=0 , 2.1118160 secs] [Times: user=1.96
sys=0.13, real=2.11 secs]
2579.317: [Full GC 2579.317: [CMS2581.876: [CMS-concurrent-mark:
2.558/1212.733 secs] [*Times: user=113.05 sys=28.01, real=**1212.49
**secs] **
*
3539.969: [Full GC 3539.969: [CMS3540.056: [CMS-concurrent-sweep:
1.571/23.223 secs] [Times: user=6.12 sys=1.36, real=*23.21 secs*]
4070.456: [Full GC 4070.457: [CMS: 1252569K->591200K(1926784K),
2.3447040 secs] 1270617K->591200K(2080128K), [CMS Perm :
169983K->56598K(169984K)] icms_dc=0 , 2.3448140 secs] [Times: user=2.18
sys=0.14, real=2.34 secs]
What can we do?
Thanks,
George
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