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From: Igor Katkov <ikatkov@gmail.com>
Date: Fri, 23 Oct 2009 00:08:46 -0400
Message-ID: <23b1e84e0910222108g772c2ab4ybe94e85383f06170@mail.gmail.com>
Subject: Re: important performance note
To: cassandra-user@incubator.apache.org
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--0015174762a47c18710476925f3b
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What OS and what JVM version was it?

On Thu, Oct 22, 2009 at 11:21 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> Brandon Williams has been doing some testing on the garbage collector
> options we are using, and found that removing the line
>
>        -XX:CMSInitiatingOccupancyFraction=1 \
>
> from bin/cassandra.in.sh dramatically increases throughput by reducing
> the amount of CPU used by the garbage collector.
>
> This will be part of 0.4.2 and 0.5, but in the meantime, thought you'd
> like to know.
>
> -Jonathan
>

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What OS and what JVM version was it?<br><br><div class=3D"gmail_quote">On T=
hu, Oct 22, 2009 at 11:21 PM, Jonathan Ellis <span dir=3D"ltr">&lt;<a href=
=3D"mailto:jbellis@gmail.com">jbellis@gmail.com</a>&gt;</span> wrote:<br><b=
lockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, 20=
4, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">

Brandon Williams has been doing some testing on the garbage collector<br>
options we are using, and found that removing the line<br>
<br>
 =A0 =A0 =A0 =A0-XX:CMSInitiatingOccupancyFraction=3D1 \<br>
<br>
from bin/<a href=3D"http://cassandra.in.sh" target=3D"_blank">cassandra.in.=
sh</a> dramatically increases throughput by reducing<br>
the amount of CPU used by the garbage collector.<br>
<br>
This will be part of 0.4.2 and 0.5, but in the meantime, thought you&#39;d<=
br>
like to know.<br>
<font color=3D"#888888"><br>
-Jonathan<br>
</font></blockquote></div><br>

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