Hey Chris,
Sorry to bother you. Did you get a chance to look at the gclog file I sent
last night.
On Wed, Jun 13, 2018, 8:44 PM rajpal reddy <rajpalreddy...@gmail.com> wrote:
> Chris,
>
> sorry attached wrong log file. attaching gc collection seconds and cpu.
> there were going high at the same time and also attached the gc.log.
> grafana dashboard and gc.log timing are 4hours apart gc can be see 06/12th
> around 22:50
>
> rate(jvm_gc_collection_seconds_sum{"}[5m])
>
> > On Jun 13, 2018, at 5:26 PM, Chris Lohfink <clohf...@apple.com> wrote:
> >
> > There are not even a 100ms GC pause in that, are you certain theres a
> problem?
> >
> >> On Jun 13, 2018, at 3:00 PM, rajpal reddy <rajpalreddy...@gmail.com>
> wrote:
> >>
> >> Thanks Chris I did attached the gc logs already. reattaching them
> now<gc.log.1.current>.
> >>
> >> it started yesterday around 11:54PM
> >>> On Jun 13, 2018, at 3:56 PM, Chris Lohfink <clohf...@apple.com> wrote:
> >>>
> >>>> What is the criteria for picking up the value for G1ReservePercent?
> >>>
> >>>
> >>> it depends on the object allocation rate vs the size of the heap.
> Cassandra ideally would be sub 500-600mb/s allocations but it can spike
> pretty high with something like reading a wide partition or repair
> streaming which might exceed what the g1 ygcs tenuring and timing is
> prepared for from previous steady rate. Giving it a bigger buffer is a nice
> safety net for allocation spikes.
> >>>
> >>>> is the HEAP_NEWSIZE is required only for CMS
> >>>
> >>>
> >>> it should only set Xmn with that if using CMS, with G1 it should be
> ignored or else yes it would be bad to set Xmn. Giving the gc logs will
> give the results of all the bash scripts along with details of whats
> happening so its your best option if you want help to share that.
> >>>
> >>> Chris
> >>>
> >>>> On Jun 13, 2018, at 12:17 PM, Subroto Barua
> <sbarua...@yahoo.com.INVALID> wrote:
> >>>>
> >>>> Chris,
> >>>> What is the criteria for picking up the value for G1ReservePercent?
> >>>>
> >>>> Subroto
> >>>>
> >>>>> On Jun 13, 2018, at 6:52 AM, Chris Lohfink <clohf...@apple.com>
> wrote:
> >>>>>
> >>>>> G1ReservePercent
> >>>>
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> >>
> >>
> >>
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>
>
