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HBase, mail # user - G1 before/after GC time graph


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Re: G1 before/after GC time graph
Azuryy Yu 2013-07-11, 01:41
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 <
[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]>
> wrote:
> > Anyway you can test this with a 32GB heap? :)
> >
> >
> > On Wed, Jul 10, 2013 at 5:23 PM, Otis Gospodnetic <
> > [EMAIL PROTECTED]> 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
> >> <[EMAIL PROTECTED]> 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
> >> > <[EMAIL PROTECTED]> wrote:
> >> >>
> >> >> What is  -Xmx heap size?
> >> >>
> >> >> Best regards,
> >> >> Vladimir Rodionov
> >> >> Principal Platform Engineer
> >> >> Carrier IQ, www.carrieriq.com
> >> >> e-mail: [EMAIL PROTECTED]
> >> >>
> >> >> ________________________________________
> >> >> From: Otis Gospodnetic [[EMAIL PROTECTED]]
> >> >> Sent: Wednesday, July 10, 2013 12:00 PM
> >> >> To: [EMAIL PROTECTED]
> >> >> 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
>