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Date: Wed, 10 Jul 2013 17:27:33 -0400
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 <CAGngS9faouXJbDX2P_vWDwRiW+Q15-osttxUXCiKMdH_zfMmOA@mail.gmail.com>
Subject: Re: G1 before/after GC time graph
From: "Kevin O'dell" <kevin.odell@cloudera.com>
To: "user@hbase.apache.org" <user@hbase.apache.org>
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Anyway you can test this with a 32GB heap? :)


On Wed, Jul 10, 2013 at 5:23 PM, Otis Gospodnetic <
otis.gospodnetic@gmail.com> wrote:

> But, very importantly:
>
> CPU after changes: https://apps.sematext.com/spm/s/CpZ9aPhL9L
> Load after changes: https://apps.sematext.com/spm/s/i7f3x6MXdZ
>
> So in practical terms, use something like -XX:MaxGCPauseMillis=200
> -XX:NewRatio=4 to force short GC pauses, but count on having more of
> them and CPU sweating more.  This gives you smaller pauses, no big STW
> pauses, but be prepared to pay in CPU cycles.
>
> HTH
>
> Otis
> --
> HBase Performance Monitoring -- http://sematext.com/spm
>
>
>
> On Wed, Jul 10, 2013 at 4:20 PM, Otis Gospodnetic
> <otis.gospodnetic@gmail.com> wrote:
> > Not big in this case - 1800m
> >
> > Otis
> > --
> > HBase Performance Monitoring -- http://sematext.com/spm
> >
> >
> >
> > On Wed, Jul 10, 2013 at 3:57 PM, Vladimir Rodionov
> > <vrodionov@carrieriq.com> wrote:
> >>
> >> What is  -Xmx heap size?
> >>
> >> Best regards,
> >> Vladimir Rodionov
> >> Principal Platform Engineer
> >> Carrier IQ, www.carrieriq.com
> >> e-mail: vrodionov@carrieriq.com
> >>
> >> ________________________________________
> >> From: Otis Gospodnetic [otis.gospodnetic@gmail.com]
> >> Sent: Wednesday, July 10, 2013 12:00 PM
> >> To: user@hbase.apache.org
> >> Subject: G1 before/after GC time graph
> >>
> >> Hi,
> >>
> >> There was talk of G1 and HBase here over the past few days.  I wanted
> >> to share a fresh and telling SPM graph showing G1 + some other params
> >> in action:
> >>
> >> Result first: https://apps.sematext.com/spm/s/wN0hKVixxX
> >>
> >> This is what we had before:
> >>   -XX:+HeapDumpOnOutOfMemoryError -XX:+UseG1GC
> >> -XX:InitiatingHeapOccupancyPercent=35 -XX:G1ReservePercent=25
> >>
> >> And then we added:
> >>   -XX:MaxGCPauseMillis=200 -XX:NewRatio=4
> >>
> >> I hope this helps.
> >>
> >> Otis
> >> --
> >> HBase Performance Monitoring -- http://sematext.com/spm
> >>
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-- 
Kevin O'Dell
Systems Engineer, Cloudera

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