I have a large list of urls that need to be tested for response time every x number of seconds. I already have a script that iterates through the list, however I would like to fork it out to speed things up.

I came across some code that appears to do what I need to do, and I've trimmed it up for example sake.. However when I run it just with a for loop to test the "iteration" part, I find that each child runs through the entire list, when I really just want the child to run through one of rows in the array -> do it's thing -> and then die..

I've already forkbombed my server once - any help with quickly parsing an array with fork would be greatly appreciated.. The example is below:

#!/usr/bin/perl

#...
$maxfork= 20;         # maximum number of procs

$stime = time();      # get current time in secs since 1970

# --- check if older proc is already running ------
stat $lock;
if (-e _) {
    $curtime = scalar localtime($stime);
    print STDERR "$curtime: LOCKED, skipping.\n";
    exit 1;
}

# nope, so lock it
open LOCK, ">$lock";
print LOCK "$$";
close LOCK;

$loop = 0;
$forked = 0;

for ($count=1; $count<50; $count++){
    if ( $forked > $maxfork) {
        wait;
        $forked--;
    }
    if ( $pid = fork ) {
        $forked++;             # parent
    } elsif ( defined $pid) {  # child
        # The place where I would like to do the work against one of t
+he array cells?
                print "Fork number is $forked - Counter is $count\n";
    } else { 
    die "error forking!";
    }
    $loop++;
}

# wait for child procs
while ( wait != -1) { ; };

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In reply to Iteration through large array using a N number of forks. by Spesh00

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