Multiple Processes on Unix with Python

[Nickson Fong]

this is helpful - what i really want to do is>
for example: i have a 2 processor irix machine and i want to launch 2
processes. 

proc #1 = render frames 1-10
proc #2 = render frames 11-20


os.fork os.execv os.wait are things that i have been reading.....

question: why do you os.spawnv?

Donn Cave wrote:
> 
> Quoth Nickson Fong <nickson at centropolisfx.com>:
> | Can anyone show me a quick example on how to fork multiple processes on
> | a multiple cpu Irix machine. I know I need os.fork() and os.execvp() but
> | can't figure out how they work together.
> 
> The reason it's so hard, is that there are so many different things
> you might want to do.  One thing you might be missing is os.waitpid(),
> but it's hard to say.
> 
> Just for something completely different, take a look at this:
> 
>     import os
> 
>     p = []
>     p.append(os.spawnv(os.P_NOWAIT, '/bin/date', ('date',)))
>     p.append(os.spawnv(os.P_NOWAIT, '/bin/date', ('date',)))
>     p.append(os.spawnv(os.P_NOWAIT, '/bin/date', ('date',)))
> 
>     while p:
>         for i in range(len(p)):
>             pi, st = os.waitpid(p[i], os.WNOHANG)
>             if pi == p[i]:
>                 del p[i]
>                 print 'pid', pi, 'status', st
>                 break
> 
>         Donn Cave, donn at oz.net

-- 
thanks


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