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From: cross@spitfire.i.gajendra.net (Dan Cross)
Newsgroups: comp.os.vms
Subject: Re: Apache + mod_php performance
Date: Fri, 27 Sep 2024 20:13:50 -0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
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References: <vcv0bl$39mnj$1@dont-email.me> <66f70712$0$711$14726298@news.sunsite.dk> <vd71o0$mnl$2@reader1.panix.com> <vd73ho$q3hr$2@dont-email.me>
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In article <vd73ho$q3hr$2@dont-email.me>,
Arne Vajhøj  <arne@vajhoej.dk> wrote:
>On 9/27/2024 3:40 PM, Dan Cross wrote:
>> In article <66f70712$0$711$14726298@news.sunsite.dk>,
>> Arne Vajhøj  <arne@vajhoej.dk> wrote:
>>> On 9/27/2024 3:16 PM, Dan Cross wrote:
>>>> In article <vd6l5h$pmt5$1@dont-email.me>,
>>>> Arne Vajhøj  <arne@vajhoej.dk> wrote:
>>>>> On 9/26/2024 11:44 AM, Dan Cross wrote:
>>>>>> In article <vd1u8j$3qqpg$1@dont-email.me>,
>>>>>> Arne Vajhøj  <arne@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.

Ok, just to clarify, you hit the web server with a single
request for a small static resource, while no other traffic was
hitting it, and that request took more than _five minutes_ to
complete?

	- Dan C.