[Labs-l] Webservice

[Petr Bena]

+1 I am on vacation and restarting my webservice every day isn't
really simple given that I have poor internet here. and there is
nobody else to do it... (having say that, feel free to start wm-bot's
webservice anytime, @Tim) :o

On Thu, Jul 10, 2014 at 5:34 PM, Tim Landscheidt <tim at tim-landscheidt.de> wrote:
> Magnus Manske <magnusmanske at googlemail.com> wrote:
>
>> I've been manually restarting about a dozen webservices for my tools in the
>> last 24h.
>
>> And before you say it, some of those were Hedonil's hand-rolled webservice.
>
>> Could we PLEASE either have a Labs-official, auto- and self-restarting
>> webservice, or something a little more stable than lighttpd (or a more
>> stable way to run it)?
>
> I looked at all the tools you are a developer of and I as-
> sume you speak about wikidata-todo.  This has some logs that
> appear to have indications of OOM shutdowns.
>
> You use a custom lighttpd configuration, and I'm not sure if
> the decision to have two PHP FCGIs doubles the memory re-
> quirements, at the moment using 6 GBytes out of 7 GBytes re-
> quested.
>
> What is clear however is that your PHP script:
>
> | 2014-07-10 14:11:39: (mod_fastcgi.c.2701) FastCGI-stderr: PHP Fatal error:  Allowed memory size of 2621440000 bytes exhausted (tried to allocate 71 bytes) in /data/project/wikidata-todo/public_html/autolist2.php on line 201
>
> uses almost 2.5 GByte of memory -- if I don't misread the
> documentation -- per /request/.
>
> Memory is cheap and we could just increase the requested
> limit, but I assume there are some PHP developers around who
> might want to have a poke at optimizing
> <https://bitbucket.org/magnusmanske/wikidata-todo/src/master/public_html/autolist2.php>.
>
> Regarding self-restarting web services, with continuous jobs
> we have a "while ! $JOB; do sleep 5; done" loop that ensures
> that the job is restarted if it aborts.  This however does
> not work on OOMs that are the predominant cause of webser-
> vice shutdowns, as the grid engine will kill the loop as
> well :-).  So we will probably have to start the webservice
> and then start a watchdog job with the webservice's job num-
> ber as its parameter that periodically checks that the web-
> service is still running and, in case, restarts the webser-
> vice.  But to do that, jobs on execution nodes need to be
> able to submit jobs, and this is still pending
> (cf. https://bugzilla.wikimedia.org/54786).
>
> Tim
>
>
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