What is you write an app that creates lots of objects, connect to it with jconsole and try forcing/requesting gc. Or just do it from the app itself. Then you can log the start and stop time and correlate that with time in gc log.
Otis Solr & ElasticSearch Support http://sematext.com/ On Jan 5, 2013 5:49 AM, "Shawn Heisey" <s...@elyograg.org> wrote: > I have a question about java GC logging. Here's a log entry that I'm > looking at: > > 2013-01-04T16:37:32.694-0700: 101832.244: [GC 101832.244: [ParNew: > 3722124K->419392K(3774912K), 9.1200100 secs] 5800224K->2591046K(7969216K), > 9.1201970 secs] [Times: user=10.46 sys=45.66, real=9.12 secs] > > This is a GC that took over 9 seconds. The timestamp is at 16:37:32 ... > but is that the time that the GC started, or is it the time that it ended? > If it is the start time, then the problem I am investigating is most > likely caused by GC pauses, but if it is end time, then I need to look for > another cause. > > I have been unable to find any definitive answer one way or the other. I > even went as far as grabbing the OpenJDK source and trying to decipher > that, but that proved too large a task. I'm actually using the Oracle JVM, > but I couldn't locate the full Oracle source code. > > If anyone knows the answer to this question, please let me know. An > official URL explaining the situation would be very nice. > > Thanks, > Shawn >
