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Posted to users@httpd.apache.org by allan juul <al...@muly.dk> on 2005/08/26 01:28:19 UTC
[users@httpd] RewriteMap prg vs cgi performance
hello,
i'm in doubt whether to use a perl cgi script or a perl program via
mod_rewrite because of performance.
the actual processing is handling a client certificate and some xml and
returning a base64-encoded string. processing takes less than a second
but let's say it takes exactly one second
if the site gets 10 simultaneously requests for a cgi it will start 10
perl interpreters (i guess) and all requests should be handled within a
second.
but what happens if the site gets 10 simultaneously requests for a URI
that is handled by a perl program via mod_rewrite? like:
RewriteMap prg:perl_program.pl
i know theres only one perl interpreter started at server startup and it
listens on STDIN - but does that mean it will handle the 10 request one
by one? i mean, in this example it would appear to take 10 seconds for
the last request?
./allan
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Re: [users@httpd] RewriteMap prg vs cgi performance
Posted by Joshua Slive <js...@gmail.com>.
On 8/25/05, allan juul <al...@muly.dk> wrote:
> hello,
>
> i'm in doubt whether to use a perl cgi script or a perl program via
> mod_rewrite because of performance.
>
> the actual processing is handling a client certificate and some xml and
> returning a base64-encoded string. processing takes less than a second
> but let's say it takes exactly one second
>
> if the site gets 10 simultaneously requests for a cgi it will start 10
> perl interpreters (i guess) and all requests should be handled within a
> second.
>
> but what happens if the site gets 10 simultaneously requests for a URI
> that is handled by a perl program via mod_rewrite? like:
>
> RewriteMap prg:perl_program.pl
>
> i know theres only one perl interpreter started at server startup and it
> listens on STDIN - but does that mean it will handle the 10 request one
> by one? i mean, in this example it would appear to take 10 seconds for
> the last request?
Yes. The requests are serialized (see the RewriteLock directive).
CGI is the safer alternative because it runs as the less-priveleged
user and a problem in one request won't hurt another request. It may
or may not be faster than the RewriteMap depending on exactly what
resources are acting as constraints.
Joshua.
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