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Date: Wed, 9 Mar 2011 09:10:14 -0800
Message-ID: <AANLkTimVrg7UxUSwetwY-wQRRCMQ9n6Vw-3CAV54aPDT@mail.gmail.com>
Subject: Re: Reducing memory footprint
From: Casey Deccio <casey@deccio.net>
To: user@cassandra.apache.org
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On Sat, Mar 5, 2011 at 7:37 PM, aaron morton <aaron@thelastpickle.com>wrote:

> There is some additional memory usage in the JVM beyond that Heap size, in
> the permanent generation. 900mb sounds like too much for that, but you can
> check by connecting with JConsole and looking at the memory tab. You can
> also check the heap size there to see that it's under the value you've set.
>
>
Thanks for the tip!

>From JConsole:
Heap memory usage: Current 46M; Max 902M
Non-Heap memory usage: Current 34M; Max 200MB

Both of these seem reasonable and don't reach the (current) 2.1 GB resident
usage I am seeing.

Check you are using standard disk access (in conf/cassandra.yaml) rather
> than memory mapped access. However the memory mapped memory is reported as
> virtual memory, not resident. So I'm just mentioning it to be complete.
>
>
At the moment, it's set to "auto", but it's a 64-bit machine, so I believe
it's using memory mapped.  The virtual memory usage says that it is 54.6 GB.

If you think you've configured things correctly and the JVM is not behaving
> (which is unlikely) please include some information on the JVM and OS
> versions and some hard numbers about what the process is using.
>
>
Debian 6.0 using openjdk-6-jre-lib-6b18-1.8.3-2+squeeze1

Thanks for your help.

Casey

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On Sat, Mar 5, 2011 at 7:37 PM, aaron morton <span dir=3D"ltr">&lt;<a href=
=3D"mailto:aaron@thelastpickle.com" target=3D"_blank">aaron@thelastpickle.c=
om</a>&gt;</span> wrote:<br><div class=3D"gmail_quote"><blockquote class=3D=
"gmail_quote" style=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0=
pt 0pt 0pt 0.8ex; padding-left: 1ex;">

<div style=3D"word-wrap: break-word;">There is some additional memory usage=
 in the JVM beyond that Heap size, in the permanent generation. 900mb sound=
s like too much for that, but you can check by connecting with JConsole and=
 looking at the memory tab. You can also check the heap size there to see t=
hat it&#39;s under the value you&#39;ve set.=A0<div>

<br></div></div></blockquote><div><br>Thanks for the tip!<br><br>From JCons=
ole:<br>Heap memory usage: Current 46M; Max 902M<br>Non-Heap memory usage: =
Current 34M; Max 200MB<br><br>Both of these seem reasonable and don&#39;t r=
each the (current) 2.1 GB resident usage I am seeing.<br>
<br></div><blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid=
 rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style=3D"word-wrap: break-word;"><div></div><div>Check you are using s=
tandard disk access (in conf/cassandra.yaml) rather than memory mapped acce=
ss. However the memory mapped memory is reported as virtual memory, not res=
ident. So I&#39;m just mentioning it to be complete.</div>

<div><br></div></div></blockquote><div><br>At the moment, it&#39;s set to &=
quot;auto&quot;, but it&#39;s a 64-bit machine, so I believe it&#39;s using=
 memory mapped.=A0 The virtual memory usage says that it is 54.6 GB.<br>
<br></div><blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid=
 rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div st=
yle=3D"word-wrap: break-word;"><div></div><div>If you think you&#39;ve conf=
igured things correctly and the JVM is not behaving (which is unlikely) ple=
ase include some information on the JVM and OS versions and some hard numbe=
rs about what the process is using.</div>

<div><br></div></div></blockquote><div><br>Debian 6.0 using openjdk-6-jre-l=
ib-6b18-1.8.3-2+squeeze1<br><br>Thanks for your help.<br><br>Casey<br>
</div></div>

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