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Date: Wed, 19 Oct 2016 14:53:47 +0200
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To: Rasmus Lerdorf <rasmus@lerdorf.com>
Cc: =?UTF-8?B?SsOpcsOpbWllIEJPUkRJRVI=?= <jeremie.bordier@gmail.com>, 
	PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Performance drops after some time, PHP7-FPM + Docker
From: jeremie.bordier@gmail.com (=?UTF-8?B?SsOpcsOpbWllIEJPUkRJRVI=?=)

Hello Rasmus,

Thank you for the insight. I ran exactly what you said, on the very
same php-fpm process, once just after restarting it almost 2 days ago,
so having fast response time, and one just right now after the "slow
down" issue triggered during the night.

The output of the perf diff is quite poor I think, here's the mainline :
    35.90%  +44.94%  php-fpm             [.] 0x0000000000042412
    10.72%   -6.05%  libc-2.19.so        [.] 0x0000000000079030
     9.71%   -9.34%  newrelic.so         [.] 0x0000000000030980
     3.81%   -3.47%  [kernel.kallsyms]   [k] ipt_do_table
     2.56%   -2.02%  [kernel.kallsyms]   [k] nf_iterate
     2.32%   -1.99%  opcache.so          [.] 0x0000000000008cec
     1.44%           [kernel.kallsyms]   [k] update_cfs_shares
     1.42%           [kernel.kallsyms]   [k] __bpf_prog_run
     1.28%           [vdso]              [.] __vdso_gettimeofday

How could I provide more info ?

Thanks,
Best regards,
J=C3=A9r=C3=A9mie

On Fri, Oct 14, 2016 at 9:10 PM, Rasmus Lerdorf <rasmus@lerdorf.com> wrote:
> On Fri, Oct 14, 2016 at 9:15 PM, J=C3=A9r=C3=A9mie BORDIER <jeremie.bordi=
er@gmail.com>
> wrote:
>>
>> I don't really know how to investigate further. If you have any
>> pointers on how to help figuring out what's wrong, I'd love to try.
>
>
> I would breakout the Linux perf command for something like this.
>
> Run it like this:
>
> perf record -p <pid_of_a_php-fpm_process> -g
>
> Let that run for some arbitrary amount of time. Start with 10 seconds, or
> so. Then:
>
> perf report -n
>
> That should give you a nice report of what your php-fpm process did for
> those 10 seconds. Now do the same thing when you see the problem and comp=
are
> the reports.
>
> -Rasmus



--=20
J=C3=A9r=C3=A9mie BORDIER