AW: Minor GCs grow longer after Full GC

[Thomas Schatzl]

Hi Andreas,

  sorry for the somewhat late reply...

On Thu, 2015-01-22 at 19:52 +0000, Andreas Müller wrote:
> Hi Thomas,
> 
> thanks for your helpful comments.
> 
> >Which exact version of Java were you using?
> So far, we have been using Java 7_65 but we are going to switch to Java 8 these days. I will press to use
> 8_40+ following you recommendation.

Please report back any experience. This helps us a lot to further
improve G1. Preferably, if there are issues, with a log :)

> > Yes, but it seems that in your case the perm gen (or one of those additional roots) seems to be the problem.
> Good hint, but from what do you conclude that?

From that your application is a tomcat application server, the huge perm
gen in conjunction with your comments about perm gen, and some
guessing :)

We have worked together with people on another application server where
the same behavior has been seen, and we found that there has been a
similar problem with code roots and class unloading.

Thanks,
  Thomas