incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Sebastien Coutu <sco...@openplaces.org>
Subject Re: Cassandra memory problem
Date Mon, 04 Jul 2011 13:41:41 GMT
We had an issue like that a short while ago here. This was mainly happening
under heavy load and we managed to stabilize it by tweaking the Young/Old
space ratio of the JVM and by also tweaking the tenuring thresholds/survivor
ratios. What kind of load to you have on your systems? Mostly reads, writes?

SC

On Mon, Jul 4, 2011 at 6:52 AM, Daniel Doubleday
<daniel.doubleday@gmx.net>wrote:

> Hi all,
>
> we have a mem problem with cassandra. res goes up without bounds (well
> until the os kills the process because we dont have swap)
>
> I found a thread that's about the same problem but on OpenJDK:
>
> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Very-high-memory-utilization-not-caused-by-mmap-on-sstables-td5840777.html
>
> We are on Debian with Sun JDK.
>
> Resident mem is 7.4G while heap is restricted to 3G.
>
> Anyone else is seeing this with Sun JDK?
>
> Cheers,
> Daniel
>
> :/home/dd# java -version
> java version "1.6.0_24"
> Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
> Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)
>
> :/home/dd# ps aux |grep java
> cass     28201  9.5 46.8 372659544 7707172 ?   SLl  May24 5656:21
> /usr/bin/java -ea -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42
> -Xms3000M -Xmx3000M -Xmn400M ...
>
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>
>
> 28201 cass      20   0  355g 7.4g 1.4g S    8 46.9   5656:25 java
>
>
>
>

Mime
View raw message