Very long safepoint pauses for RevokeBias

[David Holmes]

Hi Christopher,

On 16/05/2015 10:38 AM, Christopher Berner wrote:
> I work on the Presto project, which is a distributed SQL engine, and
> intermittently (roughly once an hour) I see very long application stopped
> times (as reported by
>     -XX:+PrintGCApplicationStoppedTime). I enabled safepoint statistics, and
> see that the pause seems to be coming from a RevokeBias safepoint.
>
> Any suggestions as to how I can debug this? I already tried adding
> -XX:+PerfDisableSharedMem, in case this was related to
> https://bugs.openjdk.java.net/browse/JDK-8076103
>
> See below for safepoint statistics:
>
>           vmop                    [threads: total initially_running
> wait_to_block]    [time: spin block sync cleanup vmop] page_trap_count
>
> 2528.893: RevokeBias                       [     872          0
>    6    ]      [     0 12826 13142  6476  8177    ]  0

Your email seems to be truncated?

But just to be sure, does the application run okay with biased-locking 
disabled?

David