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

-Xtgc:concurrent

This trace displays basic extra information about the concurrent mark helper thread.

Note: You cannot use this option with the -Xgcpolicy:balanced option. If you attempt to use these two options together, the JVM does not start.

<CONCURRENT GC BK thread 0x0002645F activated after GC(5)>

<CONCURRENT GC BK thread 0x0002645F (started after GC(5)) traced 25435>

This trace shows when the background thread was activated, and the amount of tracing it performed (in bytes).

Parent: -Xtgc tracing

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