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From Asaf Mesika <asaf.mes...@gmail.com>
Subject Re: G1 before/after GC time graph
Date Thu, 11 Jul 2013 17:18:00 GMT
This means you can safely run Hadoop and Hbase on jvm 7?
We were just considering switching in production to java 7.

On Thursday, July 11, 2013, Azuryy Yu wrote:

> Otis,
>
> I will do this test, maybe on the end of this month. because I haven't big
> memory server for test now util the end of this month.
>
>
>
>
> On Thu, Jul 11, 2013 at 9:38 AM, Otis Gospodnetic <
> otis.gospodnetic@gmail.com> wrote:
>
> > Hi,
> >
> > Probably not any time in the near future.  We could do it, plop SPM in
> > it and watch, but don't have time for it now.
> >
> > If anyone wants to give it a shot and use SPM to capture various
> > JVM/HBase/server metrics, let me know if help around SPM is needed,
> > longer trials, or whatever.
> >
> > Otis
> > --
> > HBase Performance Monitoring -- http://sematext.com/spm
> >
> >
> >
> > On Wed, Jul 10, 2013 at 5:27 PM, Kevin O'dell <kevin.odell@cloudera.com>
> > wrote:
> > > 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:
> > >> >>

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