IBM Pattern Modeling and Analysis Tool for Java Garbage Collector

1. What does an IBM® verbose GC trace look like?

An IBM verbose GC trace typically looks like this:

<AF[1]: Allocation Failure. need 1544 bytes, 0 ms since last AF> <AF[1]: managing allocation failure, action=1 (0/3983128) (209640/209640)> <GC(1): GC cycle started Tue Apr 24 10:49:58 2001> <GC(1): freed 1421672 bytes, 38% free (1631312/4192768), in 9 ms> <GC(1): mark: 8 
ms, sweep: 1 ms, compact: 0 ms> <GC(1): refs: soft 0 (age >= 32), weak 17, final 16, phantom 0> <AF[1]: completed in 10 ms>

Notes:

• GC(1): The 1st garbage collection cycle in this JVM (Java™ virtual machine).
• freed 1,421,672 bytes: An indication of the amount of activity since the last garbage collection cycle.

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