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

-Xtgc:dump

This trace shows extra information following the sweep phase of a global garbage collection.

This is an extremely large trace – a sample of one GC's output is:

<GC(4) 13F9FE44 freelen=x000002C4 -- x00000038 spec/jbb/Stock>
<GC(4) 13FA0140 freelen=x00000010>
<GC(4) 13FA0150 freelen=x00000050 -- x0000001C java/lang/String>
<GC(4) 13FA0410 freelen=x000002C4 -- x00000024 spec/jbb/infra/Collections/
     longBTreeNode>
<GC(4) 13FA0788 freelen=x00000004 -- x00000050 java/lang/Object[]>
<GC(4) 13FA0864 freelen=x00000010>
<GC(4) 13FA0874 freelen=x0000005C -- x0000001C java/lang/String>
<GC(4) 13FA0B4C freelen=x000002C4 -- x00000038 spec/jbb/Stock>
<GC(4) 13FA0E48 freelen=x00000010>
<GC(4) 13FA0E58 freelen=x00000068 -- x0000001C java/lang/String>
<GC(4) 13FA1148 freelen=x000002C4 -- x00000038 spec/jbb/Stock>
<GC(4) 13FA1444 freelen=x00000010>
<GC(4) 13FA1454 freelen=x0000006C -- x0000001C java/lang/String>
<GC(4) 13FA174C freelen=x000002C4 -- x00000038 spec/jbb/Stock>
<GC(4) 13FA1A48 freelen=x00000010>
<GC(4) 13FA1A58 freelen=x00000054 -- x0000001C java/lang/String>
<GC(4) 13FA1D20 freelen=x000002C4 -- x00000038 spec/jbb/Stock>
<GC(4) 13FA201C freelen=x00000010>
<GC(4) 13FA202C freelen=x00000044 -- x0000001C java/lang/String>
<GC(4) 13FA22D4 freelen=x000002C4 -- x00000038 spec/jbb/Stock>
<GC(4) 13FA25D0 freelen=x00000010>
<GC(4) 13FA25E0 freelen=x00000048 -- x0000001C java/lang/String>
<GC(4) 13FA2890 freelen=x000002C4 -- x00000038 spec/jbb/Stock>
<GC(4) 13FA2B8C freelen=x00000010>
<GC(4) 13FA2B9C freelen=x00000068 -- x0000001C java/lang/String>
<GC(4) 13FA2E8C freelen=x000002C4 -- x00000038 spec/jbb/Stock>
<GC(4) 13FA3188 freelen=x00000010>

A line of output is printed for every free chunk in the system, including dark matter (free chunks that are not on the free list for some reason, usually because they are too small). Each line contains the base address and the size in bytes of the chunk. If the chunk is followed in the heap by an object, the size and class name of the object is also printed.

Parent: -Xtgc tracing

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