[jboss-as7-dev] Optimal MSC threadpool size?

[Dimitris Andreadis]

Brian, I am not sure I understand, especially the reconciliation bit.

You are saying that whoever is producing the task list to feed to the pool is not breaking 
those tasks into pieces that can be parallelized?

In any case, we seem to have many threads sitting there idle.

I suppose, I need to look at the code in more detail.

On 09/12/2011 22:02, Brian Stansberry wrote:
> If you set org.jboss.server.bootstrap.maxThreads you disable the boot
> time logic that tries to parallelize running all the operations that
> load extensions and install subsystems subsystem.
>
> Why? Because that parallelization spawns quite a number of threads, and
> the original intent of org.jboss.server.bootstrap.maxThreads was to
> control thread counts. And there's been no time to reconcile the two.
>
> On 12/9/11 11:39 AM, Dimitris Andreadis wrote:
>> I was experimenting a bit with the MSC threadpool size
>> (org.jboss.server.bootstrap.maxThreads) vs boot time and I've put the results here:
>>
>> http://community.jboss.org/wiki/ModularServiceContainer-OptimalThreadpoolSize
>>
>> On my quad-core/dual-threaded machine with 8 reported processors, the default pool size is
>> 16 (processors x 2). In most cases this looks like an overkill to me, i.e. you can get
>> pretty much the same or better results with a thread pool of 4, or even 2.
>>
>> Another conclusion seems to be that not too much stuff gets parallelized under the hood?
>> Even with 1 thread the default config boots pretty much in the same time, while some benefit
>> kicks in as soon as you have some form of I/O in the full and ha configs. But even then,
>> with a thread pool of 2 you achieve most of this gain.
>>
>> Do I miss something? Do you see different results?
>>
>> Just try a single threaded boot:
>> standalone.bat -Dorg.jboss.server.bootstrap.maxThreads=1
>>
>> I am using the latest 7.1.0.CR1-SNAPSHOT
>>
>> /D
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>
>

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Dimitris Andreadis
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