http://www.perlmonks.org?node_id=545655


in reply to perl threads and dual core hyper-threading

FWIW,
foreach $host (@syshosts) { threads->new(\&locateSysHost_Parallel, $host)->join; }
starts threads sequentially, since join waits until the thread is finished. So if there are issues with threads running simultaneously, then you're not testing that in this case.