Re: Fw: Writeup on AIO design (uploaded) - corrected url

From: Suparna Bhattacharya (suparna@in.ibm.com)
Date: Wed Jan 30 2002 - 11:00:47 EST


On Wed, Jan 30, 2002 at 10:46:27AM -0500, Jakub Jelinek wrote:
> On Wed, Jan 30, 2002 at 08:51:15PM +0530, Suparna Bhattacharya wrote:
> >
> > Oops, oops, oops, I mispelt the website.
> > It should have been:
> >
> > http://lse.sourceforge.net/io/aionotes.txt
>
> a. User level threads
> - glibc approach (one user thread per operation ?)
> poor scalability, performance
>
> Glibc uses a pool of threads, not one thread per operation.
> All requests against a single file descriptor are served sequentially,
> while for different fds they are served by different threads unless aio
> thread limit has been reached, in which case they are queued too.

Thanks for the clarification.
What is the aio thread limit like ?

>
> b. Pool of threads
> - have a pool of threads servicing an aio request queue for the
> task - tradeof between degree of concurrency/utilization and
> resource consumption.
>
> Jakub
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