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From Colm MacCarthaigh <>
Subject Re: [PATCH] event driven MPM
Date Tue, 08 Jun 2004 22:02:36 GMT
On Tue, Jun 08, 2004 at 10:23:56AM -0400, Greg Ames wrote:
> I'm interested to know how httpd 2.x can be made more scalable.  Could we 
> serve
> 10,000 clients with current platforms as discussed at
> , without massive code churn and module 
> breakage?

I've served over 20,000 using http 2.x, our current record was just over
23,000 back in February. Stock 2.x code with only a slight 10-liner
patch which enabled sendfile for IPv4 connections only and the higher
hardlimits patch I jokingly sent to the list (and got committed ;).

I mailed Dan (c10k person) back on the third of February about it but
I never got a reply. As previously stated on the list the server is
running Linux 2.6.x-mm2 (where x is usually the most current), it's
a Dell 2650, dual 2.4Ghz Xeon, 12Gb of RAM.

Keepalive's are on, though "Timeout" is 30, MaxKeepAliveRequests 100 ,
KeepAliveTimeout 15, the net/ipv4/tcp_keepalive_time sysctl is 300
and I've found;

fs/xfs/refcache_size = 512
vm/min_free_kbytes = 1024000
vm/lower_zone_protection = 1024
vm/page-cluster = 5
vm/swappiness = 10

all helped lots :) This is all with prefork as well, worker works out
slower for our load for some reason. Oh and while I'm at it, the same
server ( recently shipped 966Mbit/sec in
production, but only to about 5,000 concurrent users, that was the
release of Fedora Core/2.

10k is way to low a target, I didn't even have to configure much to
achieve that. 100k is a good target :)

> I believe that reducing the number of active threads would help by reducing
> the stack memory requirements.

I've found that to work for us, with definite good results. I'll
certainly try it on (after it looks ready ;) and report
back if that's useful.

Colm MacCárthaigh                        Public Key:

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