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

-Xtgc tracing

By enabling one or more TGC (trace garbage collector) traces, more detailed garbage collection information than that displayed by -verbose:gc will be shown.

This section summarizes the different -Xtgc traces available. The output is written to stdout. More than one trace can be enabled simultaneously by separating the parameters with commas, for example -Xtgc:backtrace,compaction.

• -Xtgc:backtrace
  This trace shows information tracking which thread triggered the garbage collection.
• -Xtgc:compaction
  This trace shows information relating to compaction.
• -Xtgc:concurrent
  This trace displays basic extra information about the concurrent mark helper thread.
• -Xtgc:dump
  This trace shows extra information following the sweep phase of a global garbage collection.
• -Xtgc:excessiveGC
  This trace shows statistics for garbage collection cycles.
• -Xtgc:freelist
  Before a garbage collection, this trace prints information about the free list and allocation statistics since the last GC.
• -Xtgc:parallel
  This trace shows statistics about the activity of the parallel threads during the mark and sweep phases of a global garbage collection.
• -Xtgc:scavenger
  This trace prints a histogram following each scavenger collection.
• -Xtgc:terse
  This trace dumps the contents of the entire heap before and after a garbage collection.

Parent: Garbage Collector diagnostic data

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