Ways to get gc stats programatically or logged?

[Bernd Eckenfels]

Hello,

not sure how much automation you need and how much time you want to
spend. But the open source GCViewer can parse and graph GClogs. It can
also be used as a parser or to export it in CSV format. It is however
not very complete with G1 events.

https://github.com/chewiebug/GCViewer/wiki

From inside the VM you can always sample the JMX MBeans provided by
hotspot. Each pool can have a before/after statistic. But its not so
fine grained than verbose GC logs are. And unfortunatelly you need to
sample it as there are no notifications.

The third option is I guess the flight recorder. As you are insise
Oracle it should not be a too big of a problem. I however dont know how
complete the events are.

Gruss
Bernd


Am Tue, 23 Sep 2014 17:22:26 -0400
schrieb Derek White <derek.white at oracle.com>:

> Hi All,
> 
> I'm doing a writeup on a soft real-time system (robots for the FIRST 
> Robotics Competition) and I'm looking for ways to get gc stats like
> max pause time and total gc time. I can sum up verbosegc numbers but
> I'd like to make this easy for some customers to run.
> 
> I'd like to get these numbers in a production build, and both logged
> and display in some slick tool like visualvm.
> 
> Any ideas?
> 
> Thanks,
>   - Derek
>