Unexplained period of increasing ParNew pause and User CPU time

[Jon Masamitsu]

Shane,

You may be seeing

8081629  CMS split_block() does not correctly fix up block-offset-table 
for large blocks

https://bugs.openjdk.java.net/browse/JDK-8081629

If you can try an early release version of jdk9, this bug is
fixed there.

Jon

On 03/04/2016 10:33 AM, Shane Cox wrote:
>
> We are running Java 8_45 on Linux.  We are seeing period of time when 
> ParNew pause time steadily increases from 5ms to over 1 second.  As 
> the pause time increases, User CPU time increases in proportion.  
> Then, just as suddenly as the problem started, it ends and pause time 
> returns to 5ms.
>
> GC log attached.  The issue begins around 2016-02-28T17:05 and ends at 
> 2016-02-28T19:33.  During that span of nearly 2.5 hours, ParNew pause 
> time steadily increased from 5ms to 1.47 seconds.  CPU utilization 
> ranged from 95-99% idle during this period.  Percent free memory did 
> not change during this period.
>
> Any ideas what might be causing this?
>
>
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