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#! perl -slw
use strict;
...
__END__
c:\test>pua-head-urls urls.list
Took 1333.616000 seconds

#! perl -slw
use threads stack_size => 4096;
...
c:\test>t-head-urls -THREADS=30 urls.list
Processed 2596
Took 43.670000 with 30 threads