Author: Gian-Carlo Pascutto
Date: 09:56:45 08/09/02
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On August 09, 2002 at 11:46:58, Robert Hyatt wrote: >OK.. then this question. One process holds the lock. The O/S happens to >schedule the _other_ process which is spinning on the lock. That process >spins for whatever the scheduling time quantum is, typically about .4 seconds. > >That represents a .4 second slice of time when _no_ useful work is being done. >While on a real dual, the second processor would run, clear the lock and the >first would only spin for microseconds rather than hundreds of milliseconds... Oops, I never considered this. Thanks for clearing that up. >It just means your estimated speedup is going to be very pessimistic and will >only be useful as a lower bound, with the actual speedup somewhere above that >bound. Pleasant surprises are always nice ;) -- GCP
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