IBM Pattern Modeling and Analysis Tool for Java Garbage Collector
A tool that parses verbose GC trace, analyzes Java heap usage, and recommends key configurations based on pattern modeling of Java heap usage.
Date Posted: April 12, 2005
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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>
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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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