Re: Apache + mod_php performance

On 9/27/2024 8:07 PM, Arne Vajhøj wrote:

On 9/25/2024 5:10 PM, Arne Vajhøj wrote:

It must be Apache.
>
Apache on VMS is prefork MPM. Yuck.
>
MaxSpareServers 10 -> 50
MaxClients 150 -> 300
>
actually did improve performance - double from 11 to 22
req/sec.
>
But the system did not like further increases. And besides
these numbers are absurd high to handle a simulator doing requests
from just 20 threads.
>
But not sure what else I can change.

 And we have a solution.
 httpd.conf
 KeepAlive On
->
KeepAlive Off
 And numbers improve dramatically.
 nop.txt 281 req/sec
nop.php 176 req/sec
real PHP no db con pool 94 req/sec
real PHP db con pool 103 req/sec
 Numbers are not great, but within acceptable.
 It is a bug in the code.
 Comment in httpd.conf say:
 # KeepAlive: Whether or not to allow persistent connections (more than
# one request per connection). Set to "Off" to deactivate.
 It does not say that it will reduce throughput to 1/10'th if on.

Note that the problem may not impact anyone in
the real world.
I am simulating thousands of independent users using keep alive
with a single simulator not using keep alive.
It could very well be the case that the problem only arise for
the simulator and not for the real users.
Still weird though.
Arne