Why is sub micro-second time important and if it is why are you using Perl which implies a non-real time OS? Even using dedicated hardware for time critical applications with that degree of time precision can be challenging so the implication of your post is that you have made a major challenge for yourself!

Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond

In reply to Re: The most precise second (timer) by GrandFather
in thread The most precise second (timer) by tukusejssirs

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