Re: Async I/O on IRIX 6.x?

I didn4t even get it to compile :) It keeps
complaining about an undefine SCHED_OTHER in aiops.c.
Our sysadmin put in the newest pthread Patches
for Irix 6.4, but it didn4t help.

Rainer

Alex Rousskov wrote:
>
> On Tue, 1 Sep 1998, Duane Wessels wrote:
>
> > Has anyone gotten asyncronous I/O to work on IRIX 6.x?
>
> More precisely, has anyone gotten asynchronous I/O to work better than
> synchronous I/O on IRIX 6.x? :)
>
> If there are async/IRIX gurus out there, here is what we have:
>
> Workload:
> 40 simulated clients, each submitting requests as soon as
> they get reply,
> 1 simulated server
> no hits
> all requests cachable
> no persistent connections
>
> The configuration gets about 500req/sec thru a null-proxy. (Null-proxy runs
> on the same machine and just forwards requests to the server and replies to
> the clients).
>
> When Squid 1.2 replaces our null-proxy and starts with an empty cache, we
> get about 30req/sec for sync-io and 12 req/sec for async-io.
>
> All these numbers are preliminary, but the sync/async difference is already
> obvious and disturbing.
>
> Async-io always complains about NUMTHREADS being too low (currently 128, tried
> 16, 32, and 64). The distribution of waiting threads may look like this:
>
> Queue Length = 2278
>
> # %
> OPEN 378 16.59
> READ 0 0.00
> WRITE 804 35.29
> CLOSE 1096 48.11
>
> #reads is always 0. #close is always close to 50%.
>
> Any clues? What tools are async-people using to debug threads performance?
>
> Thanks,
>
> Alex.

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