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census-instrumentation / opencensus-go

A stats collection and distributed tracing framework
http://opencensus.io
Apache License 2.0
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Optimize `Record()` to avoid extra allocations #1267

Closed howardjohn closed 3 years ago

howardjohn commented 3 years ago

Currently, Record() re-uses code with RecordWithOptions. This always creates allocations for createRecordOption, which is not needed in this case - we only have measurements and not generic options.

With a little code duplication, we can reduce these allocations.

name                    old time/op    new time/op    delta
Record0-6                 92.2ns ± 9%     1.7ns ± 4%   -98.11%  (p=0.008 n=5+5)
Record1-6                  665ns ± 5%     634ns ± 6%    -4.57%  (p=0.095 n=5+5)
Record8-6                 1.24µs ± 5%    1.21µs ± 5%    -2.18%  (p=0.206 n=5+5)
Record8_WithRecorder-6     796ns ± 5%     777ns ± 5%    -2.45%  (p=0.222 n=5+5)
Record8_Parallel-6        1.21µs ± 2%    1.26µs ±24%      ~     (p=0.690 n=5+5)
Record8_8Tags-6           1.23µs ± 4%    1.23µs ± 2%      ~     (p=0.968 n=5+5)

name                    old alloc/op   new alloc/op   delta
Record0-6                  80.0B ± 0%      0.0B       -100.00%  (p=0.008 n=5+5)
Record1-6                   200B ± 0%      120B ± 0%   -40.00%  (p=0.008 n=5+5)
Record8-6                   424B ± 0%      344B ± 0%   -18.87%  (p=0.008 n=5+5)
Record8_WithRecorder-6      424B ± 0%      424B ± 0%      ~     (all equal)
Record8_Parallel-6          424B ± 0%      344B ± 0%   -18.87%  (p=0.008 n=5+5)
Record8_8Tags-6             424B ± 0%      344B ± 0%   -18.87%  (p=0.008 n=5+5)

name                    old allocs/op  new allocs/op  delta
Record0-6                   1.00 ± 0%      0.00       -100.00%  (p=0.008 n=5+5)
Record1-6                   4.00 ± 0%      3.00 ± 0%   -25.00%  (p=0.008 n=5+5)
Record8-6                   4.00 ± 0%      3.00 ± 0%   -25.00%  (p=0.008 n=5+5)
Record8_WithRecorder-6      4.00 ± 0%      4.00 ± 0%      ~     (all equal)
Record8_Parallel-6          4.00 ± 0%      3.00 ± 0%   -25.00%  (p=0.008 n=5+5)
Record8_8Tags-6             4.00 ± 0%      3.00 ± 0%   -25.00%  (p=0.008 n=5+5)

Note to reviewers: This PR has two commits. The first is broken out into https://github.com/census-instrumentation/opencensus-go/pull/1266; likely that should be merged first For https://github.com/census-instrumentation/opencensus-go/issues/1265

howardjohn commented 3 years ago

https://github.com/census-instrumentation/opencensus-go/pull/1270 fixes the build failure