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Re: granularity of data

From: Rick Jones <raj_at_cup.hp.com>
Date: Thu, 12 Apr 2001 09:56:35 -0700

> The actual granularity of the timers is left to the lower OS layer to
> provide. The gettimeofday() struct indicates up to microsecond
> resolution, while the GetLocalTime() struct has a millisecond field.

And one should not assume that if the structure returned in gettimeofday
has microseconds that one actually gets microsecond granularity. In the
SPEC benchmarking world, we've encountered a number of systems where the
accuracy was measured in milliseconds. Not a problem until you want to
measure individual sub-millisecond quantities who's start times are
based on a timer expiration :)

rick jones

-- 
ftp://ftp.cup.hp.com/dist/networking/misc/rachel/
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to email, OR post, but please do NOT do BOTH...
my email address is raj in the cup.hp.com domain...
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Received on 2001-04-15

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