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doc: add managing multiple builds section to benchmarking guide #16142

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doc: add managing multiple builds section to benchmarking guide #16142

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13 changes: 13 additions & 0 deletions doc/guides/writing-and-running-benchmarks.md
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Expand Up @@ -163,6 +163,19 @@ First build two versions of Node.js, one from the master branch (here called
`./node-master`) and another with the pull request applied (here called
`./node-pr-5134`).

To run multiple compiled versions in parallel you need to copy the output of the
build: `cp ./out/Release/node ./node-master`. Check out the following example:

```console
$ git checkout master
$ ./configure && make -j4
$ cp ./out/Release/node ./node-master

$ git checkout pr-5134
$ ./configure && make -j4
$ cp ./out/Release/node ./node-pr-5134
```

The `compare.js` tool will then produce a csv file with the benchmark results.

```console
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