I'm using the latest Time::HiRes 1.66, but the version which is a part of perl 5.8.6 (v1.65) also fails. You're right in that it seems to pass according to CPAN Testers. And certainly if perl 5.8.6 was failing on all Solaris 2.6 machines i'm sure we'd have heard about it, so i can only conclude that it is something to do with the particular machine or patch of solaris that i am on. Anyone have any ideas? Sagar