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copied!<p>I've searched for "secs" in the source code of JDK 1.6 update 23 (most recent 1.6 version I could find it for) and for regex "[^"]*->[^"]*" through the GC code folders in hope of finding a lead. I've also searched through the OpenJDK 1.7 code. Then I tried searching the entire HotSpot folder for "[^"]*->[^"]*"?.*secs. Yet, the only line of GC logging I've found that seems remotely related to what you're seeing is</p> <pre><code>gclog_or_tty->print("[%s-concurrent-%s: %3.3f/%3.3f secs]", _collector->cmsGen()->short_name(), _phase, _collector->timerValue(), _wallclock.seconds()); </code></pre> <p>That's in concurrentMarkSweepGeneration.cpp. It doesn't look even close to the format you've seen. Either I'm not searching very well, or something changed in between update 23 and update 25 regarding GC logging.</p> <p>If anyone has a clearer idea of where to look or what to search on, I'll be glad to oblige.</p> <p>EDIT: wait, found something starting at line 827 of concurrentMarkSweepGeneration.cpp:</p> <pre><code>void ConcurrentMarkSweepGeneration::printOccupancy(const char *s) { GenCollectedHeap* gch = GenCollectedHeap::heap(); if (PrintGCDetails) { if (Verbose) { gclog_or_tty->print(" [%d %s-%s: "SIZE_FORMAT"("SIZE_FORMAT")]", level(), short_name(), s, used(), capacity()); } else { gclog_or_tty->print(" [%d %s-%s: "SIZE_FORMAT"K("SIZE_FORMAT"K)]", level(), short_name(), s, used() / K, capacity() / K); } } if (Verbose) { gclog_or_tty->print(" "SIZE_FORMAT"("SIZE_FORMAT")", gch->used(), gch->capacity()); } else { gclog_or_tty->print(" "SIZE_FORMAT"K("SIZE_FORMAT"K)", gch->used() / K, gch->capacity() / K); } } </code></pre> <p>And that function's being called only here:</p> <pre><code>void CMSCollector::do_CMS_operation(CMS_op_type op) { gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); TraceTime t("GC", PrintGC, !PrintGCDetails, gclog_or_tty); TraceCollectorStats tcs(counters()); switch (op) { case CMS_op_checkpointRootsInitial: { checkpointRootsInitial(true); // asynch if (PrintGC) { _cmsGen->printOccupancy("initial-mark"); } break; } case CMS_op_checkpointRootsFinal: { checkpointRootsFinal(true, // asynch false, // !clear_all_soft_refs false); // !init_mark_was_synchronous if (PrintGC) { _cmsGen->printOccupancy("remark"); } break; } default: fatal("No such CMS_op"); } } </code></pre> <p>It sure looks like what you're getting. I'm not so good at interpreting this code, but I'd say what you're seeing is simply a log line showing the current heap use followed by the committed heap size in parentheses, nothing more. Basically the same info but without the use before garbage collection.</p>

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