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From Victor Kabdebon <victor.kabde...@gmail.com>
Subject Re: memory consuption
Date Thu, 17 Feb 2011 20:10:31 GMT
Is it possible to change the maximum JVM heap memory use in 0.6.X ?

2011/2/17 Aaron Morton <aaron@thelastpickle.com>

> What are you using for disk_access_mode ?
> Have you tried reducing the JVM head size?
> Have you added the Jna.jar file to lib/ ? This will allow Cassandra to lock
> the JVM memory.
>
>
> Aaron
>
>
> On 17/02/2011, at 9:20 PM, ruslan usifov <ruslan.usifov@gmail.com> wrote:
>
>
>
> 2011/2/16 Aaron Morton < <aaron@thelastpickle.com>aaron@thelastpickle.com>
>
>> JVM heap memory is controlled by the settings in conf/Cassandra-env.sh
>>
>> Memory mapped files will use additional virtual memory, is controlled in
>> conf/Cassandra.yaml disk_access_mode
>>
>>
> And??? JVM memory heap in cassandra 0.7 is by default half of memory is
> system in my case 4GB, here is a part of cassandra-env.sh:
>
> calculate_heap_size()
> {
>     case "`uname`" in
>         Linux)
>             system_memory_in_mb=`free -m | awk '/Mem:/ {print $2}'`
>             MAX_HEAP_SIZE=$((system_memory_in_mb / 2))M
>             return 0
>         ;;
>         FreeBSD)
>             system_memory_in_bytes=`sysctl hw.physmem | awk '{print $2}'`
>             MAX_HEAP_SIZE=$((system_memory_in_bytes / 1024 / 1024 / 2))M
>             return 0
>         ;;
>         *)
>             MAX_HEAP_SIZE=1024M
>             return 1
>         ;;
>     esac
> }
>
>
>
> I set all this options by default. All my nodes have 8GB of memory. And i
> affraid that after some time all my nodes goes to hard swap, and only reboot
> help them :-(((
>
> PS: as i understand that down sometime of cassandra is normal?
>
>

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