2021-03-27 14:12:45 +00:00
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---
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title: "Skia Perf"
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linkTitle: "Skia Perf"
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---
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[Skia Perf](https://perf.skia.org) is a web application for analyzing and
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viewing performance metrics produced by Skia's testing infrastructure.
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2021-04-05 13:17:20 +00:00
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<img src=../Perf.png style="margin-left:30px" align="left" width="800"/> <br clear="left">
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2021-03-27 14:12:45 +00:00
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Skia tests across a large number of platforms and configurations, and each
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commit to Skia generates more than 400,000 individual values that are sent to
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Perf, consisting mostly of performance benchmark results, but also including
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memory and coverage data.
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Perf offers clustering, which is a tool to pick out trends and patterns in large sets of traces.
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2021-04-05 13:17:20 +00:00
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<img src=../Cluster.png style="margin-left:30px" align="left" width="400"/> <br clear="left">
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2021-03-27 14:12:45 +00:00
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And can generate alerts when those trends spot a regression:
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2021-04-05 13:17:20 +00:00
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<img src=../Regression.png style="margin-left:30px" align="left" width="800"/> <br clear="left">
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2021-03-27 14:12:45 +00:00
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## Calculations
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Skia Perf has the ability to perform calculations over the test data
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allowing you to build up interesting queries.
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This query displays the ratio of playback time in ms to the number of ops for desk\_wowwiki.skp:
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ratio(
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ave(fill(filter("name=desk_wowwiki.skp&sub_result=min_ms"))),
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ave(fill(filter("name=desk_wowwiki.skp&sub_result=ops")))
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)
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You can also use the data to answer questions like how many tests were run per commit.
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count(filter(""))
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See Skia Perf for the [full list of functions available](https://perf.skia.org/help/).
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