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<a href="https://github.com/uber-go/tally/commit/<a class=hub.com/uber-go/tally/commit/f874b521696eb1aa795250fbb18e59fb76ecd8f0">f874b5216<a href="https://github.com/uber-go/tally/commit/f874b521696eb1aa795250fbb18e59fb76ecd8f0">&quot;&gt;m3: Remove atomic from TCalcTransport (#119)

The TCalcTransport is used by a single caller at a time, with a
mutex used to protect access:
https://github.com/uber-go/tally/blob/</a><a class="double-link" href="https://github.com/uber-go/tally/commit/<a class="double-link" href="https://github.com/uber-go/tally/commit/5431c04afc0bad76ce91ca3d549abb469abd2a10">5431c04af</a>">5431c04af</a><a href="https://github.com/uber-go/tally/commit/f874b521696eb1aa795250fbb18e59fb76ecd8f0">/m3/reporter.go#L400

The thrift generated code will only call `Write` serially, so there&#39;s no
need to use atomics here.

Removal of atomics gives a small performance improvement (10-15%):
```
&gt; benchcmp -best old new
benchmark                 old ns/op     new ns/op     delta
BenchmarkCalulateSize     538           453           -15.80%
```

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