[Bamboo-Users] high cpu load

[Olaf Görlitz]

Hi Sean,

I realized that the high cpu load was caused by a different part of my
code - not at all by bamboo. So the trace led me into the wrong direction.

But still, as the trace shows, there seems to be a lot of communication
going on in the core bamboo classes. With all logging turned on there is
a constant flow of notifications about timer updates etc. - even if just
one node is running and no other operation is executed.

Is there a way to tune the frequency/amount of these internal updates?

My config looks like this:

<sandstorm>

  <global>
    <initargs>
      node_id   localhost:3630
    </initargs>
  </global>

  <stages>

    <Network>
      class bamboo.network.Network
      <initargs>
      </initargs>
    </Network>

    <Rpc>
      class bamboo.lss.Rpc
      <initargs>
      </initargs>
    </Rpc>

    <Router>
      class bamboo.router.Router
      <initargs>
        gateway_count 1
        gateway_0 localhost:3630
      </initargs>
    </Router>

    <StorageManager>
      class bamboo.db.StorageManager
      <initargs>
        homedir     /home/goerlitz/dht
      </initargs>
    </StorageManager>

    <DataManager>
      class bamboo.dmgr.DataManager
      <initargs>
        merkle_tree_expansion   2
        desired_replicas        4
      </initargs>
    </DataManager>

    <Dht>
      class bamboo.dht.Dht
      <initargs>
        storage_manager_stage   StorageManager
        min_replica_count       1
      </initargs>
    </Dht>

    <Gateway>
      class bamboo.dht.Gateway
      <initargs>
        port     3632
      </initargs>
    </Gateway>

    <Vivaldi>
      class bamboo.vivaldi.Vivaldi
      <initargs>
        vc_type          2.5d
        generate_pings   true
        eavesdrop_pings  false
        use_reverse_ping true
        ping_period      10000
        version          1
      </initargs>
    </Vivaldi>

    <WebInterface>
      class bamboo.www.WebInterface
      <initargs>
        storage_manager_stage StorageManager
      </initargs>
    </WebInterface>

  </stages>
</sandstorm>


Cheers,
Olaf


On 12.12.2007 19:15, Sean Rhea wrote:
> What OS are you using?  Can you attach you .cfg file?
> 
> Bamboo uses VERY little CPU on PlanetLab.
> 
> Sean
> 
> 
> On Dec 12, 2007 3:23 AM, Olaf Görlitz <goerlitz at uni-koblenz.de> wrote:
>> Hi all,
>>
>> I'm experiencing a constantly high cpu load of 100% when running bamboo.
>> I tried to pinpoint the cause with Java's build in profiler (-Xprof) and
>> got following output for Thread-1 which is the ASyncCoreImpl instance.
>>
>> Flat profile of 198.82 secs (9964 total ticks): Thread-1
>>
>>   Interpreted + native   Method
>>  99.3%     0  +  9878    sun.nio.ch.PollArrayWrapper.poll0
>>   0.3%     0  +    31    com.sleepycat.db.db_javaJNI.DbEnv_open0
>>   0.2%     0  +    15    com.sleepycat.db.db_javaJNI.initialize
>>   0.0%     0  +     3    com.sleepycat.db.db_javaJNI.DbTxn_commit0
>>   0.0%     0  +     3    bamboo.dht.ReturnToClient.<init>
>>   0.0%     0  +     2    java.lang.Thread.start0
>>   0.0%     0  +     2    java.lang.Class.forName0
>>  ...
>>  99.9%     5  +  9936    Total interpreted
>>
>> Does anyone know why sun.nio.ch.PollArrayWrapper.poll0 is called so
>> often? How can I reduce the cpu load?
>>
>> Regards,
>> Olaf
>> _______________________________________________
>> Bamboo-Users mailing list
>> Bamboo-Users at bamboo-dht.org
>> http://bamboo-dht.org/cgi-bin/mailman/listinfo/bamboo-users
>>
> 
> 
>