Re: mp2: starting a new completely separate perl process

[Stas Bekman <st...@stason.org>]

Stefan Loones wrote:
> Hi all,
> 
> First of all sorry if this is not really mod_perl related
> 
> I'm looking for the best way to start a new process from a (SetHandler 
> modperl) PerlResponseHandler. I don't want the ResponseHandler to wait 
> for the new process. So the new process needs to be completely 
> independent. The new process will be doing lots of database queries, and 
> put the results in a queue (mysql), were it can be read by the next 
> apropriate request from the user.
> 
> I'm thinking about doing this like :
> system("path/to/newprocess.pl data > /dev/null >2>&1 &");
> 
> Tests with a newprocess.pl script that only does "sleep(300)" seems to 
> act like suspected. The PerlResponseHandler doesn't wait for it, so 
> that's ok. It are no child processes, that's also ok. But when I restart 
> Apache, these new processes all dissappear, and this means they are not 
> really independent.
> 
> The questions:
> Is this the best way of doing this ?
> Can/will this have a negative effect on mod_perl and/or the perfomance 
> of mod_perl ?

It's all explained here:
http://perl.apache.org/docs/1.0/guide/performance.html#Forking_and_Executing_Subprocesses_from_mod_perl
Though you may need to make a few small tweaks to adjus to the 2.0 API.

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