How long should the profiles be to use with Profile-Guided Optimization (PGO)?

[Agustin Horacio Urquiza Toledo]

Hello,

I am trying to use PGO in my project and I would like to know how well it works. I have collected 10 minutes of CPU profiling data from production. Is this enough? I’m asking because it’s very difficult to change my code in production and I want to be sure that my code, compiled with PGO, was sufficient to see an improvement.

Could someone please help me? I can’t find this information anywhere.

Thanks,

Agustin

[qiulaidongfeng]

In my experience, if defult.pgo shows hot path.   30s can have a good optimization.

[Agustin Horacio Urquiza Toledo]

Great, I will try with 5 minutes just in case given that the compilation overhead is null. But I have observed that the profiles converge on the hot paths and not exist difference between 2 and 5 minutes.

Thanks.