There are many ways round this without having to resort to a sleep - the most obvious being Time::HiRes, which (although system-dependant) will give you a much higher resolution than time().
Another way is to add a counter variable, something like (untested)...
my %idcount;
my @ids;
for (0..5){
my $t=time();
push @ids, $t."-".++$idcount{$t};
}
...resulting in "12345678-1","12345678-2" etc.
Cheers, Ben.
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