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From Greg Stein <>
Subject Re: [PATCH] worker MPM: reuse transaction pools
Date Tue, 28 Aug 2001 19:17:03 GMT
On Mon, Aug 27, 2001 at 05:09:01PM -0700, Aaron Bannert wrote:
> This patch implements a resource pool of context pools -- a queue of
> available pools that the listener thread can pull from when accepting
> a request. The worker thread that picks up that request then uses
> that pool for the lifetime of that transaction, clear()ing the pool
> and releasing it back to what I'm calling the "pool_queue" (har har).
> This replaces the prior implementation that would create and destroy
> a transaction pool for each and every request.
> I'm seeing a small performance improvement with this patch, but I suspect
> the fd_queue code could be improved for better parallelism. I also
> suspect that with better testing this algorithm may prove more scalable.

What does "small" mean?

I can't believe it is all that large. Pool construction/destruction is
actually quite fast. The bulk of the time is clearing the pool, which you
must do anyways. I don't see how a pool queue can provide any benefit.

IOW, why should this complexity be added? Just how much does it improve
things, and are you testing on a single or multi processor machine?


p.s and yes, I know Ryan just applied it, but that doesn't mean it should
stay there :-)

Greg Stein,

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