[development] estimating execution time left and hook_cron

nitin gupta nitingupta.iitg at gmail.com
Fri Sep 18 20:03:44 UTC 2009

hey, thanks for pointing this out but as I see the job queue module uses a
timer_read('page') to see the current execution time. Who starts this timer?
Is it set by the PHP when the execution starts? becuase if it so, then the
work is done.
One more thing I would like to ask from the experienced ones, I have been
working with PHP for just a while now (say 10 months), but what I am really
confused about is how do we get to know so many things that are of our
interest? I mean sometimes I just end up reinventing the wheel.

Nitin Kumar Gupta

On Sat, Sep 19, 2009 at 1:15 AM, Michael Prasuhn <mike at mikeyp.net> wrote:

> You may want to check out the Job Queue module, as it provides the
> functionality you are looking for. You could either add a dependency on it
> (recommended) or at least read through the code to see how it works, to
> prevent timeouts (It has a feature to check execution time and stop
> processing if the time reached is half of the max execution time).
> http://drupal.org/project/job_queue
> -Mike
> __________________
> Michael Prasuhn
> 503.512.0822 office
> mike at mikeyp.net
> http://mikeyp.net
> On Sep 18, 2009, at 10:16 AM, nitin gupta wrote:
>  Hello,
>> I am maintaining the module feedapi imagegrabber, which pulls the images
>> from the original url of the feed items (just like google reader). It is
>> implemented on the top of feedapi and hence implements the
>> feedapi_after_refresh() hook, which is basically fired by the feedapi after
>> it has refreshed the feed.
>> Now, as my module download images from an external website, I can never be
>> sure about the time it will take to complete the job of downloading images
>> for all the feed items. Therefore, sometimes I get a 'fatal execution time
>> exceeded error'. How can I know how much execution time is left, so that I
>> can return on time by saving the rest of the work as a cron job?
>> I have gone through the source code of FeedAPI which implements
>> hook_cron(). It uses a variable called 'cron_semaphore', which I am guessing
>> is some way to share execution time but am unable to get how. I will really
>> appreciate if someone can explain the above to me or provide some tutorial
>> links on writing a good hook_cron implementation.
>> --
>> Regards,
>> Nitin Kumar Gupta
>> http://publicmind.in/blog/
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