Commit Graph

7 Commits

Author SHA1 Message Date
cdalton
e1b8958877 Add samplingTime mode to nanobench
Adds a nanobench mode that takes samples for a fixed amount of time,
rather than taking a fixed amount of samples.

BUG=skia:

Review URL: https://codereview.chromium.org/1204153002
2015-06-25 19:17:08 -07:00
Mike Klein
912947737a Use __rdtsc on Windows.
This seems to be ~100x higher resolution than QueryPerformanceCounter.  AFAIK, all our Windows perf bots have constant_tsc, so we can be a bit more direct about using rdtsc directly: it'll always tick at the max CPU frequency.

Now, the question remains, what is the max CPU frequency to divide through by?  It looks like QueryPerformanceFrequency actually gives the CPU frequency in kHz, suspiciously exactly what we need to divide through to get elapsed milliseconds.  That was a freebie.

I did some before/after comparison on slow benchmarks.  Timings look the same.  Going to land this without review tonight to see what happens on the bots; happy to review carefully tomorrow.

R=mtklein@google.com
TBR=bungeman

BUG=skia:

Review URL: https://codereview.chromium.org/394363003
2014-07-16 19:59:32 -04:00
mtklein
6238688af0 Give windows boring bars and use 'us' for microseconds.
NOTREECHECKS=true

BUG=skia:
R=bsalomon@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/393673006
2014-07-15 10:30:31 -07:00
mtklein
a189ccdb4d nanobench: add --runOnce.
BUG=skia:
R=egdaniel@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/392583005
2014-07-14 12:28:48 -07:00
mtklein
5d9d10e821 nanobench: add a cute bar chart
Give this a try?  Helpful, or gets in the way?

BUG=skia:
R=krajcevski@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/390483002
2014-07-11 11:57:07 -07:00
mtklein
40b32be371 nanobench: add median and --cpu/--gpu
BUG=skia:
R=krajcevski@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/377283002
2014-07-09 08:46:50 -07:00
mtklein
90c471e73f Refine bench_record and bench_playback:
- use high-precision wall timer only
  - warm caches once before measuring
  - measure independent samples, calculating statistics
  - add --verbose to control how much data we output

Also removed some unloved features from bench_record.

BUG=skia:
R=jcgregorio@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/338203002
2014-06-16 14:04:34 -07:00