JDK-8059216 : Make PrintGCApplicationStoppedTime print information about stopping threads
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 9
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • Submitted: 2014-09-26
  • Updated: 2015-06-03
  • Resolved: 2014-10-31
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JDK 7 JDK 8 JDK 9
7u80Fixed 8u40Fixed 9 b40Fixed
Related Reports
Relates :  
JDK-6924453 - Replace/rename PrintGCApplication{Concurrent|Stopped}Time flags.
Description
Currently the PrintGCApplicationStoppedTime flag only prints the total time the application was stopped. In some cases it is very interesting to know how long it took to stop or start all threads. We should add that information to the output.

Note that PrintGCApplicationStoppedTime is a misleading name since it tracks all safepoints and not just GC pauses. See JDK-6924453.
Comments
From en email conversation with Mattis Castegren: I think it would be good to get one line when the threads starts to be stopped. This makes it easier to correlate to other logs. Also, if the JVM hangs during the stopping, we will at least get the output. Howabout 156651.955: [Stopping Threads] 156664.310: [GC concurrent-root-region-scan-start] ... 156664.355: Total time for which application threads were stopped: 12.4237013 seconds, Stopping threads took: 4.71 seconds, Starting threads took 0.01 seconds. /Mattis
29-09-2014