Re: [boost] [threadpool] mixture of recursive invokation and fibers?

Subject: Re: [boost] [threadpool] mixture of recursive invokation and fibers?
From: Oliver Kowalke (k-oli_at_[hidden])
Date: 2008-11-05 04:25:36

> > Imagine we have stage A which reads message from the network and stage B
> > processing
> > the messages read by A. If both use the same threadpool and mltiple 
> > clients send a large
> > messages (ready will take some significant time) stage A coul possibly 
> > allocate all
> > threads in the pool so not work-item in stage B can be executed. If both
> > stages use
> > different pools the processing of work-items is independent.
> > B can executes its task even if stage A becomes a high load.
> 
> Why the A would allocate all the the threads in the pool? If the stage A 
> handle a message and the request B to do somthing the task of B will be 
> enqueued before other new messages comming from the network, so B will be 
> interleaved with A. What I'm missing?

data-flow: network -> stage A -> stage B -> network

If 10.000 clients are connected to the service and 1% of the clients send a large message then stage A is triggered to read/process 100 requests at the same time - possibly all threads of the pool are used by stage A and tasks of stage B are queued in the pool until a worker-thread are finished with items of A.

regards,
Oliver

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