Long pauses with parallel collector

[Jon Masamitsu]

Karl Rosenbaum wrote:
> Yes, it should be the serial compaction that we see, but why don't I see any 
> long pauses in the first piece of statistics. It obviously should be able to run 
>   an old generation collection without a 60 s pause.
> 
> To clarify, my question is "Why do I see the 60 s pauses now, when I didn't see 
> them a few days before."
> 
> As I said, we have applied the CMS now, but we still need to understand what was 
>   going on, and unfortunately we couldn't make any logging, because it is a 
> production server that we can't experiment with.

Without more information (i.e., logs) I for one cannot tell
what's happening here.  I understand that you cannot experiment
in production but some of our customers always have GC logging
on by default.  We don't hear complaints about any performance
impact (and have not seen one ourselves) so in the future you
may want to consider turning on logging by default.

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