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From Daning <dan...@netseer.com>
Subject Lots of GC in log
Date Thu, 22 Sep 2011 16:51:45 GMT
We are testing Cassandra with pretty big load, I saw frequent GCs in the 
log, Do you have suggestion about how to reduce them?

  NFO [ScheduledTasks:1] 2011-09-22 09:38:41,080 GCInspector.java (line 
122) GC for ParNew: 297 ms for 1 collections, 2503106624 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:39:20,873 GCInspector.java (line 
122) GC for ParNew: 376 ms for 1 collections, 2533372976 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:39:22,203 GCInspector.java (line 
122) GC for ParNew: 352 ms for 1 collections, 2543060640 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:39:28,286 GCInspector.java (line 
122) GC for ParNew: 204 ms for 1 collections, 2643405616 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:39:57,827 GCInspector.java (line 
122) GC for ParNew: 231 ms for 1 collections, 2684999576 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:39:59,892 GCInspector.java (line 
122) GC for ParNew: 262 ms for 1 collections, 2592862320 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:40:01,901 GCInspector.java (line 
122) GC for ParNew: 269 ms for 1 collections, 2707133848 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:40:46,471 GCInspector.java (line 
122) GC for ParNew: 340 ms for 1 collections, 2648946352 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:40:48,522 GCInspector.java (line 
122) GC for ParNew: 683 ms for 1 collections, 2744305224 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:40:50,784 GCInspector.java (line 
122) GC for ParNew: 370 ms for 1 collections, 2713584488 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:41:36,857 GCInspector.java (line 
122) GC for ParNew: 241 ms for 1 collections, 2782038560 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:41:50,126 GCInspector.java (line 
122) GC for ParNew: 449 ms for 1 collections, 2928576048 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:42:05,399 GCInspector.java (line 
122) GC for ParNew: 219 ms for 1 collections, 2869447448 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:42:30,139 GCInspector.java (line 
122) GC for ParNew: 207 ms for 1 collections, 3021355184 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:42:31,326 GCInspector.java (line 
122) GC for ParNew: 341 ms for 1 collections, 2920592304 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:42:32,815 GCInspector.java (line 
122) GC for ParNew: 534 ms for 1 collections, 3024423936 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:42:34,822 GCInspector.java (line 
122) GC for ParNew: 216 ms for 1 collections, 3136655600 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:42:42,028 GCInspector.java (line 
122) GC for ParNew: 360 ms for 1 collections, 3053516464 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:42:43,544 GCInspector.java (line 
122) GC for ParNew: 769 ms for 1 collections, 3072173664 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:42:44,584 GCInspector.java (line 
122) GC for ParNew: 279 ms for 1 collections, 3094692872 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:43:00,788 GCInspector.java (line 
122) GC for ParNew: 367 ms for 1 collections, 3192674736 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:43:37,051 GCInspector.java (line 
122) GC for ParNew: 350 ms for 1 collections, 3400034520 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:43:38,138 GCInspector.java (line 
122) GC for ParNew: 270 ms for 1 collections, 3212172456 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:44:00,679 GCInspector.java (line 
122) GC for ParNew: 301 ms for 1 collections, 3239850624 used; max is 
8015314944
  INFO [ScheduledTasks:1] 2011-09-22 09:44:02,690 GCInspector.java (line 
122) GC for ParNew: 534 ms for 1 collections, 3308763856 used; max is 
8015314944

Thanks in advance.

Daning

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