[Info-vax] Apache + mod_php performance

[Arne Vajhøj]

On 9/27/2024 3:40 PM, Dan Cross wrote:
> In article <66f70712$0$711$14726298 at news.sunsite.dk>,
> Arne Vajhøj  <arne at vajhoej.dk> wrote:
>> On 9/27/2024 3:16 PM, Dan Cross wrote:
>>> In article <vd6l5h$pmt5$1 at dont-email.me>,
>>> Arne Vajhøj  <arne at vajhoej.dk> wrote:
>>>> On 9/26/2024 11:44 AM, Dan Cross wrote:
>>>>> In article <vd1u8j$3qqpg$1 at dont-email.me>,
>>>>> Arne Vajhøj  <arne at vajhoej.dk> 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.
>>>>>
>>>>> My guess is that communications overhead is slowing things down.
>>>>> What happens if you set these super low, ideally so there's a
>>>>> single process handling requests, then see what sort of QPS
>>>>> numbers you get for your trivial text file.
>>>>
>>>> I set it down to 1.
>>>>
>>>> 0.1 req/sec
>>>
>>> So a single request takes 10 seconds?  Or you can only make one
>>> request every 10 seconds, but the time taken to process that
>>> request is relatively small?
>>
>> It is throughput.
>>
>> N / time it takes to get response for N requests
>>
>> With 20 threads in client then there will always be 20 outstanding
>> requests.
> 
> How long does it take to serve a single request?

Based on the above information it should be 200 seconds.

But it is actually more like 340 seconds. So apparently the 0.1
req/sec is rounded up a bit.

Arne