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Add native profiling instructions

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Nathan Sobo
2016-03-31 16:52:36 -06:00
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# Profiling the Atom Render Process on OS X with Instruments
![Instruments](https://cloud.githubusercontent.com/assets/1789/14193295/d503db7a-f760-11e5-88bf-fe417c0cd913.png)
* Determine the version of Electron for your version of Atom.
* Open the dev tools with `alt-cmd-i`
* Evaluate `process.versions.electron` in the console.
* Based on this version, download the appropriate Electron symbols from the [releases](https://github.com/atom/electron/releases) page.
* The file name should look like `electron-v0.X.Y-darwin-x64-dsym.zip`.
* Decompress these symbols in your `~/Downloads` directory.
* Now create a time profile in Instruments.
* Open `Instruments.app`.
* Select `Time Profiler`
* In Atom, determine the pid to attach to by evaluating `process.pid` in the dev tools console.
* Attach to this pid via the menu at the upper left corner of the Instruments profiler.
* Click record, do your thing.
* Click stop.
* The symbols should have been automatically located by Instruments (via Spotlight or something?), giving you a readable profile.