Ok, in your case I would (and actually am) rather use some kind of
batching system (torque in my case).
But the problem is that I would very much have a version of the
system, when only one machine is available that would do all the work
on the background with perhaps some lower priority. And it seems
really strange that it's not a trivial task just to spawn a child
process and continue the parent. I have a feeling that it is still
perfectly doable.
Ilja
On May 8, 8:01 pm, "Joseph Heck" <[EMAIL PROTECTED]> wrote:
> For a light (i.e. short) duration process that you want results from
> to return to the user, it's fairly straightforward. Here's some code
> we're using to report our current code revision in an admin dashboard:
>
> def get_code_revision():
> import os
> x = os.popen("/usr/bin/svnversion /u/django/webcode")
> versionstring = x.readline()
> x.close()
> return versionstring.strip()
>
> For spawning a longer running background process (as you mention
> towards the end), this really isn't an appropriate mechanism. Instead
> look for something where you can pass a "do this" message to another
> mechanism that will do the work in the background. In our case, we
> have a number of what we've terms "out of band" processing, and we use
> simple tokens in the database as a quick and dirty message system. So
> the view method will insert a row in the database, and a background
> process will periodically poll the database for any rows to process.
> It's not suitable to really high bandwidth messaging needs, but it
> works nicely for us.
>
> Alternately, you can come up with some mechanism that is more "event
> like" and asynchronous.
>
> -joe
>
> On 5/8/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> > I've spent quite a lot of time trying to simply spawn a new process
> > (by spawn I mean os.P_NOWAIT). The problem is that I cannot manage to
> > get django not to halt after the execution of the process spawning
> > command (the idea is that in views I want to start a background
> > process that is quite time intense).
>
> > I've tried os.spawnl and subprocces.Popen, neither work. Or I'm just
> > too n00b in Python and Django to understand how they should be
> > handled. Perhaps anybody could help me? Pleease?
>
> > Thanks,
> > Ilja
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