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auto merge of #10952 : huonw/rust/1ms-bench, r=cmr

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This makes sure we always run benchmarks even if they are predicted to
take a long time, so that we have some non-zero time to display
(although the error bars may be huge for particularly slow benchmarks).

Fixes #9532.
This commit is contained in:
bors 2013-12-14 14:11:21 -08:00
commit ca54ad8592
1 changed files with 10 additions and 1 deletions
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11
src/libextra/test.rs
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@ -1110,6 +1110,15 @@ pub fn auto_bench(&mut self, f: |&mut BenchHarness|) -> stats::Summary {
} else {
n = 1_000_000 / self.ns_per_iter().max(&1);
}
// if the first run took more than 1ms we don't want to just
// be left doing 0 iterations on every loop. The unfortunate
// side effect of not being able to do as many runs is
// automatically handled by the statistical analysis below
// (i.e. larger error bars).
if n == 0 { n = 1; }
debug!("Initial run took {} ns, iter count that takes 1ms estimated as {}",
self.ns_per_iter(), n);
let mut total_run = 0;
let samples : &mut [f64] = [0.0_f64, ..50];
@ -1141,7 +1150,7 @@ pub fn auto_bench(&mut self, f: |&mut BenchHarness|) -> stats::Summary {
let now = precise_time_ns();
let loop_run = now - loop_start;
// If we've run for 100ms an seem to have converged to a
// If we've run for 100ms and seem to have converged to a
// stable median.
if loop_run > 100_000_000 &&
summ.median_abs_dev_pct < 1.0 &&