IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Garbage Collector diagnostic data > Verbose garbage collection logging

Garbage collection operation

Every garbage collection increment contains at least one garbage collection operation, shown in the verbose output with a <gc-op> tag.

The timems attribute of the <gc-op> tag indicates the time taken to complete the garbage collection operation, in milliseconds. The contextid attribute indicates the ID of the corresponding garbage collection cycle. In the following example, contextid="4" indicates that this garbage collection operation is part of the garbage collection cycle that has the tag <cycle-start id="4">.

The <gc-op> output contains subsections that describe operations that are specific to different garbage collection policies. These subsections might change from release to release, when improvements are made to the technology or when new data becomes available.

<gc-op id="7" type="scavenge" timems="1.127" contextid="4" timestamp="2010-11-23T00
 :41:32.515">
  <scavenger-info tenureage="10" tiltratio="50" />
  <memory-copied type="nursery" objects="2304" bytes="289896" bytesdiscarded="0" />
  <finalization candidates="28" enqueued="1" />
  <references type="soft" candidates="5" cleared="0" enqueued="0" dynamicThreshold=
   "32" maxThreshold="32" />
  <references type="weak" candidates="6" cleared="4" enqueued="0" />
  <references type="phantom" candidates="1" cleared="0" enqueued="0" />
</gc-op>

Parent: Verbose garbage collection logging

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