Max possible heap size for Concurrent Mark Sweep collector.

[Tao Mao]

How large is the machine's memory? and how many vm's did you try to run on
one machine at the same time?

On Wed, Sep 10, 2014 at 2:53 PM, Alexey Ragozin <alexey.ragozin at gmail.com>
wrote:

> Hi,
>
> Sometimes ago we have tried to setup 200GiB heap per JVM using CMS GC.
> Oracle HotSpot JVM have failed to start with following error
>
> Java HotSpot(TM) 64-Bit Server VM warning: CMS bit map allocation failure
> Java HotSpot(TM) 64-Bit Server VM warning: Failed to allocate CMS Bit Map
> Error occurred during initialization of VM
> Could not create CMS collector
> Error: Could not create the Java Virtual Machine.
> Error: A fatal exception has occurred. Program will exit.
>
> JVM command line
>
> /usr/java/jdk1.7.0_60/bin/java -d64 -verbose:gc -XX:+UseConcMarkSweepGC
> -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -Xmn512m
> -XX:MaxTenuringThreshold=1 -Xms200G -Xmx200G
> -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=90
> -Duse-cached-field-op=false  -XX:MaxPermSize=1024m
> -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=13521
> -Dcom.sun.management.jmxremote.authenticate=false
> -Dcom.sun.management.jmxremote.ssl=false -XX:-UsePopCountInstruction
> APPLICATION_MAIN_CLASS ...
>
> We have reduced -Xmx to 180GiB and currently that is our configuration.
> Provided amount of memory on our standard hardware setup, using JVM with
> 400 GiB would be desirable.
>
> My question is
>
> Is that 200GiB fundamental limitation of CMS algorithm or it is something
> what could be remedied?
>
> Any relevant pointers to open JDK code base would be appreciated.
>
> Regards,
> Alexey
>
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>
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