[Info-vax] Apache + mod_php performance

[Arne Vajhøj]

On 9/25/2024 2:41 PM, Dan Cross wrote:
> In article <vd1bdp$3npm3$1 at dont-email.me>,
> Arne Vajhøj  <arne at vajhoej.dk> wrote:
>> On 9/25/2024 8:48 AM, Dan Cross wrote:
>>> Perhaps a simpler question: what sort of throughput does Apache
>>> on VMS give you if you just hit a simple static resource
>>> repeatedly?
>>
>> Now it becomes interesting.
>>
>> nop.php also gives 11 req/sec.
>>
>> And nop.txt also gives 11 req/sec.
>>
>> So the arrow is definitely pointing towards Apache.
> 
> I should think so.  Lesson #1: always verify your base
> assumptions when investigating something like this.
> 
>> So either something to speed up Apache or switching to WASD or OSU.
> 
> Well, the question now becomes, "what makes Apache so slow?"
> 
> I would concentrate on your nop.txt test; I assume that's a
> small (possibly empty) text file and as an example has the
> fewest number of variables.
> 
> Do your logs give any indications of what might be going on?
> For example, do the logs have host names in them, possibly
> implying your stalling on reverse DNS lookups or something
> similar?

Just logging IP address.

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.

Arne