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

-Xtgc:parallel

This trace shows statistics about the activity of the parallel threads during the mark and sweep phases of a global garbage collection.

Mark:   busy  stall  tail   acquire   release
   0:      30    30     0        0         3
   1:      53     7     0       91        94
   2:      29    31     0       37        37
   3:      37    24     0      243       237
Sweep:  busy   idle sections 127  merge 0
   0:      10     0    96
   1:       8     1     0
   2:       8     1    31
   3:       8     1     0

This trace shows four threads (0-3), together with the work done by each thread during the mark and sweep phases of garbage collection.

For the mark phase of garbage collection, the time spent in the "busy", "stalled", and "tail" states is shown (in milliseconds). The number of work packets each thread acquired and released during the mark phase is also shown.

For the sweep phase of garbage collection, the time spent in the "busy" and "idle" states is shown (in milliseconds). The number of sweep chunks processed by each thread is also shown, including the total (127). The total merge time is also shown (0ms).

Parent: -Xtgc tracing

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