Re: memory consuption

[Aaron Morton]

Looks like you are using virtual memory for memmapped files. Change the disk_access_mode to standard if you want to reduce the overall memory usage. 

Aaron

On 18 Feb, 2011,at 09:34 AM, Victor Kabdebon <victor.kabde...@gmail.com> wrote:

Sorry I forgot to say that this is the partial result of : 

ps aux | grep cassandra

Best regards

2011/2/17 Victor Kabdebon <victor.kabde...@gmail.com>

Oh right but Cassandra doesn't really respect that, I thought there was another option to set that.

Just for your information, I set xms and xmx very low with a small amount of data. I am waiting to be able to connect jconsole, I don't know why it is not reachable at the moment. Here is my result :

105      26115  0.2 273 1125328 755316 ?      Sl   Feb09  23:58 /usr/bin/java -ea -Xms64M -Xmx128M

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

bin/cassandra.in.sh 

set Xms and Xmx in the JVM_OPTS

Aaron

On 18 Feb, 2011,at 09:10 AM, Victor Kabdebon <victor.kabde...@gmail.com> wrote:

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 <ruslanusi...@gmail.com> wrote:

2011/2/16 Aaron Morton <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?