Where have the Full GCs gone?

[Moazam Raja]

Hi all, I'm running a test and recording GC information on a Tomcat  
application and have noticed that even after a few days, there are no  
'Full GC' markers. Am I reading the log incorrectly, or are the Full  
GCs getting logged elsewhere?

I'm using Java 1.5.0_13 on OS X with the following flags,

         -Xms=2048m -Xmx=2048m
         -server -XX:+UseConcMarkSweepGC
         -Xloggc:/var/tmp/GC.log
         -verbose:gc
         -XX:+PrintGCDetails
         -XX:+PrintHeapAtGC
         -XX:+PrintClassHistogram
         -XX:+PrintGCApplicationConcurrentTime


A sample of the output from my GC log:


Application time: 1.4105823 seconds
82558.187: [GC {Heap before gc invocations=111716:
  par new generation   total 21184K, used 21120K [0x0000000107270000,  
0x0000000108730000, 0x0000000108730000)
   eden space 21120K, 100% used [0x0000000107270000,  
0x0000000108710000, 0x0000000108710000)
   from space 64K,   0% used [0x0000000108710000, 0x0000000108710000,  
0x0000000108720000)
   to   space 64K,   0% used [0x0000000108720000, 0x0000000108720000,  
0x0000000108730000)
  concurrent mark-sweep generation total 20950272K, used 5483440K  
[0x0000000108730000, 0x0000000607270000, 0x0000000607270000)
  concurrent-mark-sweep perm gen total 39296K, used 23575K  
[0x0000000607270000, 0x00000006098d0000, 0x000000060c670000)
82558.187: [ParNew: 21120K->0K(21184K), 0.0669633 secs] 5504560K- 
 >5487545K(20971456K)Heap after gc invocations=111717:
  par new generation   total 21184K, used 0K [0x0000000107270000,  
0x0000000108730000, 0x0000000108730000)
   eden space 21120K,   0% used [0x0000000107270000,  
0x0000000107270000, 0x0000000108710000)
   from space 64K,   0% used [0x0000000108720000, 0x0000000108720000,  
0x0000000108730000)
   to   space 64K,   0% used [0x0000000108710000, 0x0000000108710000,  
0x0000000108720000)
  concurrent mark-sweep generation total 20950272K, used 5487545K  
[0x0000000108730000, 0x0000000607270000, 0x0000000607270000)
  concurrent-mark-sweep perm gen total 39296K, used 23575K  
[0x0000000607270000, 0x00000006098d0000, 0x000000060c670000)
}
, 0.0672098 secs]

Application time: 0.4661567 seconds
82558.721: [GC {Heap before gc invocations=111717:
  par new generation   total 21184K, used 21120K [0x0000000107270000,  
0x0000000108730000, 0x0000000108730000)
   eden space 21120K, 100% used [0x0000000107270000,  
0x0000000108710000, 0x0000000108710000)
   from space 64K,   0% used [0x0000000108720000, 0x0000000108720000,  
0x0000000108730000)
   to   space 64K,   0% used [0x0000000108710000, 0x0000000108710000,  
0x0000000108720000)
  concurrent mark-sweep generation total 20950272K, used 5487545K  
[0x0000000108730000, 0x0000000607270000, 0x0000000607270000)
  concurrent-mark-sweep perm gen total 39296K, used 23575K  
[0x0000000607270000, 0x00000006098d0000, 0x000000060c670000)
82558.721: [ParNew: 21120K->0K(21184K), 0.0591967 secs] 5508665K- 
 >5491650K(20971456K)Heap after gc invocations=111718:
  par new generation   total 21184K, used 0K [0x0000000107270000,  
0x0000000108730000, 0x0000000108730000)
   eden space 21120K,   0% used [0x0000000107270000,  
0x0000000107270000, 0x0000000108710000)
   from space 64K,   0% used [0x0000000108710000, 0x0000000108710000,  
0x0000000108720000)
   to   space 64K,   0% used [0x0000000108720000, 0x0000000108720000,  
0x0000000108730000)
  concurrent mark-sweep generation total 20950272K, used 5491650K  
[0x0000000108730000, 0x0000000607270000, 0x0000000607270000)
  concurrent-mark-sweep perm gen total 39296K, used 23575K  
[0x0000000607270000, 0x00000006098d0000, 0x000000060c670000)
}
, 0.0594283 secs]

Application time: 0.0590593 seconds
82558.840: [GC {Heap before gc invocations=111718:
  par new generation   total 21184K, used 21120K [0x0000000107270000,  
0x0000000108730000, 0x0000000108730000)
   eden space 21120K, 100% used [0x0000000107270000,  
0x0000000108710000, 0x0000000108710000)
   from space 64K,   0% used [0x0000000108710000, 0x0000000108710000,  
0x0000000108720000)
   to   space 64K,   0% used [0x0000000108720000, 0x0000000108720000,  
0x0000000108730000)
  concurrent mark-sweep generation total 20950272K, used 5491650K  
[0x0000000108730000, 0x0000000607270000, 0x0000000607270000)
  concurrent-mark-sweep perm gen total 39296K, used 23575K  
[0x0000000607270000, 0x00000006098d0000, 0x000000060c670000)
82558.840: [ParNew: 21120K->0K(21184K), 0.0589090 secs] 5512770K- 
 >5496450K(20971456K)Heap after gc invocations=111719:
  par new generation   total 21184K, used 0K [0x0000000107270000,  
0x0000000108730000, 0x0000000108730000)
   eden space 21120K,   0% used [0x0000000107270000,  
0x0000000107270000, 0x0000000108710000)
   from space 64K,   0% used [0x0000000108720000, 0x0000000108720000,  
0x0000000108730000)
   to   space 64K,   0% used [0x0000000108710000, 0x0000000108710000,  
0x0000000108720000)
  concurrent mark-sweep generation total 20950272K, used 5496450K  
[0x0000000108730000, 0x0000000607270000, 0x0000000607270000)
  concurrent-mark-sweep perm gen total 39296K, used 23575K  
[0x0000000607270000, 0x00000006098d0000, 0x000000060c670000)
}
, 0.0592058 secs]


-Moazam