ZGC Unable to reclaim memory for long time

[Sundara Mohan M]

Unfortunately i don't have that stats. I was running application with this
option for gc
log -Xlog:gc,gc+init,gc+start,gc+phases,gc+heap,gc+cpu,gc+reloc,gc+ref,gc+marking,gc+metaspace=info.
Will see if i can get that issue reproducible and get that data for you.


Thanks
Sundar

On Wed, Nov 6, 2019 at 3:08 PM Per Liden <per.liden at oracle.com> wrote:

> On 11/6/19 10:04 PM, Sundara Mohan M wrote:
> [...]
> > But on the other hand with ZGC my throughput increased from
> > *(ParallelGC)97%* to*(ZGC)99.7% *and my STW pauses have never crossed
> 20ms.
>
> Could you please paste the last printout of the "Garbage Collection
> Statistics" table? If you have pauses close to 20ms, it would be
> interesting to see where that time is spent. I would assume it's
> accounted to "Subphase: Pause Roots Threads", but seeing the whole table
> would tell the me more.
>
> thanks,
> Per
>