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From Luca Toscano <toscano.l...@gmail.com>
Subject Re: [users@httpd] problems benchmarking php-fpm/proxy_fcgi with h2load
Date Thu, 01 Feb 2018 02:58:30 GMT
Hi Hajo,

2018-01-31 2:37 GMT-08:00 Hajo Locke <Hajo.Locke@gmx.de>:

> Hello,
>
>
> Am 22.01.2018 um 11:54 schrieb Hajo Locke:
>
> Hello,
>
> Am 19.01.2018 um 15:48 schrieb Luca Toscano:
>
> Hi Hajo,
>
> 2018-01-19 13:23 GMT+01:00 Hajo Locke <Hajo.Locke@gmx.de>:
>
>> Hello,
>>
>> thanks Daniel and Stefan. This is a good point.
>> I did the test with a static file and this test was successfully done
>> within only a few seconds.
>>
>> finished in 20.06s, 4984.80 req/s, 1.27GB/s
>> requests: 100000 total, 100000 started, 100000 done, 100000 succeeded, 0
>> failed, 0 errored, 0 timeout
>>
>> so problem seems to be not h2load and basic apache. may be i should look
>> deeper into proxy_fcgi configuration.
>> php-fpm configuration is unchanged and was successfully used with
>> classical fastcgi-benchmark, so i think i have to doublecheck the proxy.
>>
>> now i did this change in proxy:
>>
>> from
>> enablereuse=on
>> to
>> enablereuse=off
>>
>> this change leads to a working h2load testrun:
>> finished in 51.74s, 1932.87 req/s, 216.05MB/s
>> requests: 100000 total, 100000 started, 100000 done, 100000 succeeded, 0
>> failed, 0 errored, 0 timeout
>>
>> iam surprised by that. i expected a higher performance when reusing
>> backend connections rather then creating new ones.
>> I did some further tests and changed some other php-fpm/proxy values, but
>> once "enablereuse=on" is set, the problem returns.
>>
>> Should i just run the proxy with enablereuse=off? Or do you have an other
>> suspicion?
>>
>
>
> Before giving up I'd check two things:
>
> 1) That the same results happen with a regular localhost socket rather
> than a unix one.
>
> I changed my setup to use tcp-sockets in php-fpm and proxy-fcgi. Currently
> i see the same behaviour.
>
> 2) What changes on the php-fpm side. Are there more busy workers when
> enablereuse is set to on? I am wondering how php-fpm handles FCGI requests
> happening on the same socket, as opposed to assuming that 1 connection == 1
> FCGI request.
>
> If "enablereuse=off" is set i see a lot of running php-workerprocesses
> (120-130) and high load. Behaviour is like expected.
> When set "enablereuse=on" i can see a big change. number of running
> php-workers is really low (~40). The test is running some time and then it
> stucks.
> I can see that php-fpm processes are still active and waiting for
> connections, but proxy_fcgi is not using them nor it is establishing new
> connections. loadavg is low and benchmarktest is not able to finalize.
>
> I did some further tests to solve this issue. I set ttl=1 for this Proxy
> and achieved good performance and high number of working childs. But this
> is paradoxical.
> proxy_fcgi knows about inactive connection to kill it, but not reenable
> this connection for working.
> May be this is helpful to others.
>
> May be a kind of communicationproblem and checking health/busy status of
> php-processes.
> Whole proxy configuration is  this:
>
> <Proxy "unix:/dev/shm/php70fpm.sock|fcgi://php70fpm">
>     ProxySet enablereuse=off flushpackets=On timeout=3600 max=15000
> </Proxy>
> <FilesMatch \.php$|\.php70$>
>    SetHandler "proxy:fcgi://php70fpm"
> </FilesMatch>
>
>
Thanks a lot for following up and reporting these interesting results! Yann
opened a thread[1] on dev@ to discuss the issue, let's follow up in there
so we don't keep two conversations open.

Luca

[1]:
https://lists.apache.org/thread.html/a9586dab96979bf45550c9714b36c49aa73526183998c5354ca9f1c8@%3Cdev.httpd.apache.org%3E

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