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Re: Parallel::ForkManager How to wait when 1st 10 Child processe are over out of 100

by Tanktalus (Canon)
on Dec 09, 2011 at 00:27 UTC ( #942524=note: print w/replies, xml ) Need Help??

in reply to Parallel::ForkManager How to wait when 1st 10 Child processe are over out of 100

I know you're using P::FM. However, I have to wonder if this would be easier to do with AnyEvent. I'm not entirely sure, as after about 10 minutes, I still don't have example code quite working :-) but maybe it's something to start with.

use 5.14.0; use EV; use AnyEvent; use AnyEvent::Util qw(run_cmd); use File::Spec; # set up my condvars my $all_done = AE::cv; $all_done->begin for 1..50; my $ten = AE::cv; # start the first 10... start_ten($ten, $all_done, $_) for 1..2; # wait for all of them to finish. $all_done->recv(); sub start_ten { my $t = shift; my $all = shift; my $one = shift; state $started = 0; # 10/100 too much for my machine... for (1..5) { $started ++; my $proc = $started; $t->begin if $one == 1; $all->end; print "Starting...$proc\n"; my $cv = run_cmd( ['sleep', rand(3)], '>' => File::Spec->devnull(), '2>' => File::Spec->devnull(), '<' => File::Spec->devnull(), ); $cv->cb( sub { my $c = shift; my $rc = $c->recv(); print "Finished $proc: $rc\n"; $t->end() }); } # when we're done, start the next ten. $t->cb( sub { my $c = shift; print "Checking next group...($started)\n"; $c->recv; $all->ready() or start_ten($t, $all, 1) }); }
There is some tweaking required - this will start the first two groups of five, and wait - once the first five come in, it goes and starts the rest. It's not waiting properly. There is also AnyEvent::Util::fork_call which is quite similar to what you want to do, and you may be able to adapt its methods to what you want to do while still leaving much of the heavy lifting to AnyEvent.

Note that 100 processes being kicked off can do serious damage to your system's responsiveness. Hopefully you have the requisite CPU/RAM :-)

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Discipulus redskins .. well native american..
[1nickt]: So if I was to offer any editorial advice it would be to (1) make it endure time passing (2) make it positive (3) make it about you and your beliefs
[1nickt]: (Disicpulus The new best choice is maybe "First People"
[karlgoethebier]: Discipulus: This is called "Volksverhetzung" in German which means
[karlgoethebier]: incitement of the people and it is prohibited by law
[1nickt]: The best sign I have sign in a protest march was carried by a kid of about 10 years "If you build a wall my generation will tear it down."
[1nickt]: ... sign I have seen ...
[1nickt]: Now that one made me hopeful! First time not angry in a long time when I saw that kid.
[Discipulus]: i propend for removing: why? because we are so few that we must find i minimal common divisor, this is certainly Perl not our (anyway private) thougths. And i say this still wondering because i love a lot freedom of expression. And i say this not for roho
[1nickt]: Discipulus that was the point of my story of taking the sticker off my truck. I know there are lots of people in the world who if I knw their private beliefs I might want to argue with them. And they with me. But life cannot all be arguments!

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