Hello!

On Wed, Jul 27, 2011 at 03:43:44PM +0200, Thomas Love wrote:

> On 26 July 2011 13:57, Maxim Dounin <mdounin@mdounin.ru> wrote:
>
> > Hello!
> >
> > Attached patch (against 1.0.5) introduces upstream keepalive
> > support for memcached, fastcgi and http. Note the patch is
> > experimental and may have problems (though it passes basic smoke
> > tests here). Testing is appreciated.
> >
> >
> Sounds great. Is it expected to work in this case:
>
> upstream fastcgi_backend {
> server unix:/tmp/php-fpm.sock
> keepalive 32;
> }

Yes (though I'm not sure if php is able to maintain connections
alive, but quick look suggests it should).

> And if so, is it expected to have a performance benefit?

Likely yes, but not a big one. It will save several syscalls per
request, but you'll unlikely to notice compared to typical php
request processing costs.

Keepalive connections are mostly beneficial if response costs are
comparable with connection establishment costs (i.e. over
high-latency links or with really fast backends).

Maxim Dounin

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