From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-09-17T22:11:37+09:00
Subject: Re: acgi-0.1.0

On Sat, 17 Sep 2005, Matthias Georgi wrote:

> Hi Ara,
>
> out of curiosity, I have been playing around with my apache2 setup and
> benchmarked cgi, acgi and fcgi. I used this configuration for maximum
> performance:
>
> <IfModule prefork.c>
> StartServers        100
> MinSpareServers     100
> MaxSpareServers     100
> MaxClients          250
> MaxRequestsPerChild  50
> </IfModule>

valuable - thanks for sharing.

> Running on my Athlon-2800 I get these results:
>
> CGI:
> # ab -n100 -c10 http://127.0.0.1:8080/env.cgi | grep "Requests per
> second"
> Requests per second:    52.00 [#/sec] (mean)
>
> ACGI:
> # ab -n100 -c10 http://127.0.0.1:8080/index.cgi | grep "Requests per
> second"
> Requests per second:    306.55 [#/sec] (mean)
>
> FCGI:
> # ab -n100 -c10 http://127.0.0.1:8080/server.fcgi | grep "Requests per
> second"
> Requests per second:    952.44 [#/sec] (mean)

wow - not bad.  but could be better eh.

> I think acgi could outperform fcgi, because the fcgi-protocol takes cares
> about multiplexing and the ruby-fcgi is not multi-threaded. So this
> multiplexing thing is maybe overhead. Do you plan a multithreaded
> implementation of acgi on the ruby side? I guess not.

i've been playing with all sorts of things but am unclear as to what the
bottleneck is.  any suggestions welcome.

> On the other hand the bottleneck is maybe the additional fork and exec, so
> mod_acgi is maybe worth doing.

maybe.  just running

   ./index.cgi </dev/null>/dev/null

shows times between 0.001 and 0.01.  so it seems the low side is about one
hundred and the high around 1000 rps.  however, that it on my machine where i
only get about 80 and 160 rps for acgi and fcgi respectively.  i've tried
various things in the c program (pthreads, forking) to make it faster and it
makes little difference afaikt - so i think the speed must come on the ruby
side.  right now i'm thinking of a way operate in non-blocking mode
exclusively but it'll take a little coding on the c side.  anyhow, i'm out of
town for a few days and will consider while i'm away.

again, thanks for looking at this.

cheers.

-a
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