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Date: Sat, 09 Feb 2013 08:51:14 -0500
From: Michael Mol <mikemol@gmail.com>
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Subject: Re: [gentoo-user] {OT} LWP::UserAgent slows website
References: <CAN0CFw0Zcn5BtzHbOVELrN+ihJ1B93+=Cr+YAfkSXJrSsuD__g@mail.gmail.com> <5113DA25.7060408@gmail.com> <CAN0CFw1bfy8huhECBFyn3H_XpOfJGPZ-BjPpXo5mGLaC_5ihHQ@mail.gmail.com> <CA+czFiCe1u=b9m+bt95Bdo9WAi6EULqBG1GqCRsZs62nWVon4w@mail.gmail.com> <CAN0CFw3hx7huykjkkujppjBcY=ZMhnYg=Sd1iM=gvvX3BxmoYg@mail.gmail.com> <5115BB67.9010307@gmail.com> <CAC=wYCFOOqSsRKLWAbAtfSh+g5kxK1sGC34SEBNQo6tYyJ_osg@mail.gmail.com>
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On 02/09/2013 05:36 AM, Adam Carter wrote:
>
> There are several things you can do to improve the state of
> things. The first and foremost is to add caching in front of the
> server, using an accelerator proxy. (i.e. squid running in
> accelerator mode.) In this way, you have a program which receives
> the user's request, checks to see if it's a request that it already
> has a response for, checks whether that response is still valid,
> and then checks to see whether or not it's permitted to respond on
> the server's behalf...almost entirely without bothering the main
> web server. This process is far, far, far faster than having the
> request hit the serving application's main code.
>
>
>
> I was under the impression that Apache coded sensibly enough to
> handle incoming requests as least as well as Squid would. Agree
> with everything else tho.
Sure, so long as Apache doesn't have any additional modules loaded. If
it's got something like mod_php loaded (extraordinarily common),
mod_perl or mod_python (less common, now) then the init time of
mod_php gets added to the init time for every request handler.
> OP should look into what's required on the back end to process
> those 6 requests, as it superficially appears that a very small
> number of requests is generating a huge amount of work, and that
> means the site would be easy to DoS.
Absolutely, hence the steps I outlined to reduce or optimize backend
processing.
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