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Postings from January 2001
On Tue, Jan 23, 2001 at 01:02:42PM +0000, Nick Ing-Simmons wrote:
> Nicholas Clark <nick@ccl4.org> writes:
> >If one uses Duff's device in PERL_HASH, the regression tests go about 2%
> >faster.
>
> Note - that may be literally true, but is not the speed difference in perl.
> The tests are riddled with sleep()s and other system timing overhead.
That is true, the timing of the whole suite is to be taken with a
biiig grain of salt -- but a test of consisting of, say, 1 second of
actual test (CPU time being burned) and 1 second of sleep gets sped up
by, say, 10%, it means that the CPU time really got slashed by 20%,
which is actually *more* significant than without the sleep.
I think the most dubious element of the test suite as a whole is the
large number of separate and relatively small scripts, the operating
system (and filesystem, and networking, and ...) dependent startup
time may taint the results quite a lot.
--
$jhi++; # http://www.iki.fi/jhi/
# There is this special biologist word we use for 'stable'.
# It is 'dead'. -- Jack Cohen
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