Unexplained Jumps In Response Time "Fixed" By Disabling Tiered Compilation

Andrew Dinn adinn at redhat.com
Fri May 27 09:41:13 UTC 2016

On 27/05/16 10:39, Andrew Dinn wrote:
> On 25/05/16 15:33, James Lent wrote:
>   . . .
>> I then tried turning off Tiered Compilation (without changing the
>> default Code Cache size) in dev and the problem went away.  Of course it
>> is hard to prove a negative.  We are now testing in production with good
>> results (over 40 hours of good performance).
>> Any thoughts?  I realize this is not much to go on, but, I thought I
>> would report my issue just in case you get other reports like this and
>> you start to see a pattern.
> Have you tried turning on listing compiles with -XX:+PrintCompilation?
> It would be very interesting to see what sort of compile activity is
> going on around the time that the jumps in response times occur. A
> comparison between +TieredCompilation and -ToetredCompilation might be

-Toetred? Hmm, I meant -Tiered of course :-)

> very informative.


Andrew Dinn
Senior Principal Software Engineer
Red Hat UK Ltd
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