[infinispan-dev] The reason(s) why we have so many threads are spawned in the testsuite

[Galder Zamarreno]

On 10/09/2009 05:49 PM, Vladimir Blagojevic wrote:
> On 09-10-09 11:32 AM, Galder Zamarreno wrote:
>>
>> On 10/09/2009 04:19 AM, Vladimir Blagojevic wrote:
>>
>>> Galder,
>>>
>>> Under profiler none of these seem to be a big problem except
>>> asyncTransport TPE. All of these threads that you saw in thread dumps
>>> are related to rehash requests spawned by LeaveTask. LeaveTask tries to
>>> submit request to TPE and is block waiting. All of these threads are. I
>>> am still trying to figure out what is going.
>>>
>> Block waiting where?
>>
> ExecutorService#submit(Callable)<---- profiler shows thread is blocked here
> RPCManagerImpl#invokeRemotelyInFuture

Hmmm, that block could be due to asyncTransport thread pool being too 
small although I can't see the exact line where this condition would 
stop. I didn't see such thing in previous thread dumps I've taken.

I don't have time to look at it right now but a quick way to figure out 
whether this is causing the slowdown would be to modify 
GlobalConfiguration to look like this:

    public static GlobalConfiguration getClusteredDefault() {
       GlobalConfiguration gc = new GlobalConfiguration();
       gc.setTransportClass(JGroupsTransport.class.getName());
       gc.setTransportProperties((Properties) null);
       Properties p = new Properties();
       p.setProperty("threadNamePrefix", "asyncTransportThread");
->>      p.setProperty("maxThreads", 10);
       gc.setAsyncTransportExecutorProperties(p);
       return gc;
    }

That will increase the asyncTransport pool from 1 to 10 threads.

>
>
> Sorry for some reason there is no copy-paste feature for a thread stack
> in the profiler! I took a snapshot 3/4 into test suite and there more
> than 20 threads blocked in the same line code.
>
>
>
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-- 
Galder Zamarreño
Sr. Software Engineer
Infinispan, JBoss Cache