Manual Reference Pages - BENCHMARK::DELTA (3)
delta.pl - calculate Benchmark::Timer object call overhead
% ./delta.pl [n]
This short script calculates the approximate speed overhead, on your
system, of using Benchmark::Timer to time repeated benchmark calls,
rather than using Time::HiRes and lexical temporary values directly.
By default, it does 10,000 trials of timing nothing. It benchmarks
using first Benchmark::Timer, then bare Time::HiRes calls, and reports
the average times taken to perform the no-op.
Subtract the second from the first to find the approximate overhead imposed
by using Benchmark::Timer. This is typically significant and consistent,
but pretty tiny, on the order of microseconds. The magnitude of the
overhead also falls quickly and asymptotically as the number of trials
increases from one, levelling off at anything over around 100 trials.
Andrew Ho <email@example.com>
Copyright(c) 2000-2001 Andrew Ho.
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
|perl v5.20.3 ||DELTA (3) ||2015-03-22 |
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