Is it possible to change the maximum JVM heap memory use in 0.6.X ?
2011/2/17 Aaron Morton <aa...@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.usi...@gmail.com> wrote:
>
>
>
> 2011/2/16 Aaron Morton < <aa...@thelastpickle.com>aa...@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?
>
>
