[users at bb.net] buildbot CPU usage

Fri Aug 26 15:35:30 UTC 2016

Hum,
It might not be stuck, actually, but just spending very long time to
compress the log.

In theory, the log compression is not waited for, though.

Note that if you stop a build that is waiting for a lost deferred, this
will have no effect as you describe.

You got absolutly no exception in twisted.log?

Pierre

Le ven. 26 août 2016 à 17:06, Neil Gilmore <ngilmore at grammatech.com> a
écrit :

> I'm currently looking at a step with 3 logs:
> 81531 lines
> 489285 lines
> 489311 lines
>
> An earlier successful run would have that first log at 244080 lines.
>
> This particular build is stuck, though. :( (which is why I'm looking at
> it.) (A bit off-topic, but I tried stopping it. The last step is marked
> cancelled, but that's the only effect.)
>
>
> Neil Gilmore
> grammatech.com
>
>
> On 8/26/2016 6:25 AM, Pierre Tardy wrote:
>
>
> The ram looks like sufficient, it might be a good test to try and increase
> the number of cpu for that VM.
> In your trace, I can see the use of up to 7 threads at the same time, so
> you might gain by going 8 CPUs
>
> Also, make sure that your VM host is not overbooked. In my experience of
> using VMware VMs provided by IT, overbooking has been a source of
> inexplicable performance issues.
>
> 12k lines is a lot, but buildbot shall support this kind of load without
> issue.
>
> Le ven. 26 août 2016 à 12:05, Francesco Di Mizio <
> francescodimizio at gmail.com> a écrit :
>
>> It's a vmware virtual machine with 4 GIGs RAM and 4 CPUs at 3Ghz. It runs,
>> among other marginal things, 2 docker containers - one for the buildbot and
>> one for the postgres db.
>>
>> The most beefy logs have around 12K lines. Is it too much?
>> Also some other logs are read from the worker's filesystem and added as
>> additional logs.
>>
>> On Fri, Aug 26, 2016 at 11:51 AM, Pierre Tardy <tardyp at gmail.com> wrote:
>>
>>> Cool!
>>> I can indeed see 3 spikes.
>>>
>>> Looks related to logs and logs compression.
>>>
>>> What is the HW spec of your master machine?
>>> How much log does your build generate?
>>>
>>> Pierre
>>>
>>> Le ven. 26 août 2016 à 11:42, Francesco Di Mizio <
>>> francescodimizio at gmail.com> a écrit :
>>>
>>>> Pierre,
>>>>
>>>> I enabled it, waited 1 min and saw the spike, then stopped after a few
>>>> secs. Attached the json.
>>>> Awesome tool btw, work wonders!
>>>>
>>>> On Thu, Aug 25, 2016 at 1:14 PM, Pierre Tardy <tardyp at gmail.com> wrote:
>>>>
>>>>> You can try to hit the button in the morning with a two hours gather
>>>>> period, and hope that you see the spike during that period..
>>>>>
>>>>>
>>>>> Le jeu. 25 août 2016 à 12:17, Francesco Di Mizio <
>>>>> francescodimizio at gmail.com> a écrit :
>>>>>
>>>>>> Thanks a lot! Pierre I will def will give it a shot. I am not sure
>>>>>> I'll be able to smash that 'start recording' button as the UI
>>>>>> isusuallystuck when the CPU spikes. Updates to come!
>>>>>>
>>>>>> On Thu, Aug 25, 2016 at 10:45 AM, Pierre Tardy <tardyp at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Hi Francesco,
>>>>>>>
>>>>>>> I spent some time in order to implement a profiler plugin for
>>>>>>> buildbot
>>>>>>>
>>>>>>> You can give it a look, and send your profile.json file if you need
>>>>>>> more analysis from me.
>>>>>>> https://github.com/tardyp/buildbot_profiler
>>>>>>>
>>>>>>> Regards,
>>>>>>> Pierre
>>>>>>>
>>>>>>>
>>>>>>> Le mer. 24 août 2016 à 22:43, Francesco Di Mizio <
>>>>>>> francescodimizio at gmail.com> a écrit :
>>>>>>>
>>>>>>>> I've tried and it's not an easy task because of my Win into Vagrant
>>>>>>>> into Docker setup.
>>>>>>>> I'll try again soon when I get a Linux  box!
>>>>>>>>
>>>>>>>> On Fri, Aug 19, 2016 at 5:54 PM, Vasily <just.one.man at yandex.ru>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> Umm, no. VTune has Python support starting 2017 Beta, and, well,
>>>>>>>>> it was my team (at Intel) work actually :-)
>>>>>>>>>
>>>>>>>>> P.S. I'm from Intel, too.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> Vasily
>>>>>>>>> 19 авг. 2016 г. 18:17 пользователь "Francesco Di Mizio" <
>>>>>>>>> francescodimizio at gmail.com> написал:
>>>>>>>>>
>>>>>>>>> I had thought you were making fun of Intel somehow ;)
>>>>>>>>>>
>>>>>>>>>> On Aug 19, 2016 5:07 PM, "Pierre Tardy" <tardyp at gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>> ahah
>>>>>>>>>>
>>>>>>>>>> I though this was a taunt on me being employed by Intel.
>>>>>>>>>> I actually had mitigated experience with vtune few years ago, and
>>>>>>>>>> didn't know they had python support until then.
>>>>>>>>>> Being an opensource guy, I usually neglegate to look at
>>>>>>>>>> proprietary stuff.
>>>>>>>>>>
>>>>>>>>>> Pierre
>>>>>>>>>>
>>>>>>>>>> Le ven. 19 août 2016 à 12:18, Vasily <just.one.man at yandex.ru> a
>>>>>>>>>> écrit :
>>>>>>>>>>
>>>>>>>>>>> I'm again suggesting to look into Python profiling capabilities
>>>>>>>>>>> of Intel® VTune™ Amplifier. It could run statistical profiling for a long
>>>>>>>>>>> time and display CPU usage over time, so the developer can look at specific
>>>>>>>>>>> time range where CPU usage was too high and see which functions were
>>>>>>>>>>> executed.
>>>>>>>>>>>
>>>>>>>>>>> Thanks,
>>>>>>>>>>> Vasily
>>>>>>>>>>> 19 авг. 2016 г. 11:57 пользователь "Pierre Tardy" <
>>>>>>>>>>> tardyp at gmail.com> написал:
>>>>>>>>>>>
>>>>>>>>>>> Hi Francesco,
>>>>>>>>>>>>
>>>>>>>>>>>> Your described setup looks sane to me.
>>>>>>>>>>>>
>>>>>>>>>>>> The problems we are trying to catch are cpu spikes, as far as I
>>>>>>>>>>>> understand, which does not happen for very long, but are very annoying for
>>>>>>>>>>>> users, as it is blocking the reactor.
>>>>>>>>>>>>
>>>>>>>>>>>> This problem is not easy to see in the profile you sent, as
>>>>>>>>>>>> this profile is over long time, so we see the average of each method during
>>>>>>>>>>>> the day and not the spikes.
>>>>>>>>>>>>
>>>>>>>>>>>> What would really be needed is a on-demand profiler which would
>>>>>>>>>>>> detect cpu spikes and only log the stack traces during those times.
>>>>>>>>>>>>
>>>>>>>>>>>> Here is a nice blog pst explaining why statistic profiling is
>>>>>>>>>>>> cool and easy to implement in python.
>>>>>>>>>>>> https://nylas.com/blog/performance
>>>>>>>>>>>>
>>>>>>>>>>>> For 0.9.1 I want to concentrate on scalability, and write a
>>>>>>>>>>>> debugging ui plugin based on those ideas (and probably code)
>>>>>>>>>>>>
>>>>>>>>>>>> That would be great if your team can help on that matter.
>>>>>>>>>>>>
>>>>>>>>>>>> Regards,
>>>>>>>>>>>> Pierre
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>
>>>>>>
>>>>
>>
>
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