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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 19:40:48 -0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
Message-ID: <vd71o0$mnl$2@reader1.panix.com>
References: <vcv0bl$39mnj$1@dont-email.me> <vd6l5h$pmt5$1@dont-email.me> <vd70af$hov$1@reader1.panix.com> <66f70712$0$711$14726298@news.sunsite.dk>
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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?

	- Dan C.