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Update benchmark comparison instructions #766

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Apr 14, 2021
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Update benchmark comparison instructions #766

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22 changes: 11 additions & 11 deletions test/benchmark/README.md
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Expand Up @@ -14,24 +14,24 @@

Given a set of changes to the codebase, it is often useful to see the difference in performance.

Once two (or more) benchmarks have been executed, compare the results with:
Once two (or more) benchmarks have been executed, compare the results by downloading the [benchmark tools](https://github.com/google/benchmark/tree/master/tools), and then run the following command:

```
# From the build folder
../test/gbenchmark/tools/compare.py benchmarks baseline.json contender.json
```
```
# From the downloaded "tools" folder
./compare.py benchmarks baseline.json contender.json
```

### CPU Scaling Warnings

Note: If you receive warnings about CPU scaling, you can change the CPU governor with:

```
sudo cpupower frequency-set --governor performance
```
```
sudo cpupower frequency-set --governor performance
```

The previous setting can be restored with:

```
sudo cpupower frequency-set --governor powersave
```
```
sudo cpupower frequency-set --governor powersave
```