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Re^2: choosing threads

by weismat (Friar)
on Feb 19, 2009 at 16:24 UTC ( #745109=note: print w/replies, xml ) Need Help??


in reply to Re: choosing threads
in thread choosing threads

If I understand this correctly, then he intends to send the same data to every thread. Thus it is not really the traditional Boss/Worker pattern as every worker will perform the exact same (not similar) task.
I have had a similar requirement with realtime data and I did not manage to get this working as unfortunately there is no way to have a shared array of Queues.
Only way would be to store the read data in memory before starting with the threads, but this means a lot of memory consumption, which will be high already with 100 threads. Update: I would be interested i there is a decent way to achieve a shared array of Queues.

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Re^3: choosing threads
by zentara (Archbishop) on Feb 19, 2009 at 16:28 UTC
    No, the data sent to each thread at the beginning of a run is different, and shifted off of an array or something. The key is for efficiency...STOP multiple spawning and/or forks...and reuse the threads, just reset them and refill with fresh data to be processed. We may be misunderstanding the fine points of what he is attempting, but reusing threads is the best for efficiency.

    I'm not really a human, but I play one on earth My Petition to the Great Cosmic Conciousness

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[Corion]: Aaah - you should be able to do this with overload, but I would hit somebody really hard if they constructed objects that are true but the empty string, and you not knowing about the domain knowledge where this makes sense
[Eily]: you could tie a variable into not having the same value each time, if you like to make people who try to debug your code facepalm
[Corion]: perl -wle 'package o; use overload q("") => sub {warn "str"; ""}, bool => sub{warn "bool"; 1}; package main; my $o={}; bless $o => o; print "Yay" if ($o && !length($o))'
[Corion]: But people writing such code should document the objects they construct and why it makes sense for an object to be invisible as string while being true in a boolean context
[hippo]: That's equal parts clever and horrendous.
[Eily]: the overload version wouldn't return true with "$x" && !length $x though, I guess
[hippo]: The more I look at this code, the more $x is a plain old scalar and the more this condition will never be true. I'm calling it a bug at this point.
[hippo]: Thanks for your input which has soothed my sanity (a little)
[Corion]: Eily: Sure - if you force both things into stringy things, then you break that magic. But that would also mean that you changed the expression, as now $x = 0.00 will be true instead of false as it were before

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