Shenandoah and cometd testing

[Aleksey Shipilev]

On 4/9/19 11:44 PM, Simone Bordet wrote:
> On Tue, Apr 9, 2019 at 11:13 PM Aleksey Shipilev <shade at redhat.com> wrote:
> FYI, in my Shenandoah run (1 server, 48g heap, 4 client machines at
> each 1k clients at 10k messages/s) the max pause was about 4ms.

Cool. If you pass -Xlog:gc+stats, you might see the dissection of those pauses at the end of the
run. For example, in a short run, -Xlog:gc+stats:file=stats.log gives this on cometd-server side:
  http://cr.openjdk.java.net/~shade/shenandoah/cometd-server-gc-stats.log

Seems to me that until we finish the pending refactoring and/or concurrent class unloading story,
-XX:-ClassUnloading might be beneficial for this workload.

-Aleksey