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Precompute encodeWithKeys buffer size to avoid resizes#1269
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dashpole merged 1 commit intocensus-instrumentation:masterfrom Sep 14, 2021
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I don't think the test failure is from my test. Maybe its a flaky test? Its in the tracing code, not stats. |
dashpole
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stats/view/collector.go
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| // encodeWithKeys encodes the map by using values | ||
| // only associated with the keys provided. | ||
| func encodeWithKeys(m *tag.Map, keys []tag.Key) []byte { | ||
| // Compute the buffer length we will need ahead of time to avoid resizing latter |
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Well, fix the typo, and hopefully it doesn't flake this time :) |
This is strictly an optimization. Right now we always undersize the buffer then later increase it. This changes the code to accurately size it the first time to ensure we never re-allocate. ``` name old time/op new time/op delta RecordReqCommand-6 2.26µs ± 5% 2.10µs ± 5% -7.39% (p=0.000 n=10+10) RecordViaStats-6 2.70µs ± 5% 2.53µs ± 4% -6.31% (p=0.000 n=10+10) name old alloc/op new alloc/op delta RecordReqCommand-6 426B ± 0% 384B ± 0% -9.86% (p=0.000 n=10+10) RecordViaStats-6 594B ± 0% 552B ± 0% -7.07% (p=0.000 n=10+10) name old allocs/op new allocs/op delta RecordReqCommand-6 25.0 ± 0% 17.0 ± 0% -32.00% (p=0.000 n=10+10) RecordViaStats-6 28.0 ± 0% 20.0 ± 0% -28.57% (p=0.000 n=10+10) ```
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This is strictly an optimization. Right now we always undersize the buffer then later increase it.
This changes the code to accurately size it the first time to ensure we never re-allocate.
See #1265