Source profiling is now available in Observatory

[John McCutchan]

Hi Dartisans,

You can now see which lines of code are hot, in any source view!

$ dart --observe DeltaBlue.dart

1. Navigate to a script view.

2. Toggle profile display.

Understanding the data:

- Profiler is sample driven so the performance data is an average.

- The column on the left is total time (including time spent waiting for callees).

- The column on the right is executing time (does not include time spent waiting for callees).

- Percentages are global to the whole program and not local to the function.

Known Issues:

- Not all generated code knows its source position, I will be improving this.

- Some samples cannot be attributed directly to a line of code (register spills, etc). These are accounted for internally but are not displayed in the UI yet.

New issues:

- Please file bugs.

Thanks,

John

[John McCutchan]

I forgot to mention this will only be available in the next -dev release!

John

[Günter Zöchbauer]

Great! This will increase test coverage a lot. Much more fun with proper feedback :)

[Jim Trainor]

This is awesome. Thanks.

Presumably this will profiling information will be available from observatory?

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