fix: optimize performance of process.OpenFiles()

[NitroCao]

fixes #1781

[NitroCao]

@Dainerx You can use the draft PR to test for now. I just find another point to optmize, and will let you know after submitting code.

[NitroCao]

Is it good and necessary to provide an iterator method for (*Process).OpenFiles() called OpenFilesSeq() to return a iter.Seq[OpenFilesStat]?

[shirou]

The Iterator is not necessary. However, since Go 1.23 —where Iterator was introduced— is the oldest Go version we support, it’s fine to use it, I think.

[NitroCao]

@shirou Please merge the PR if you think everything is ok.

[shirou]

A slight change can now be made to speed up the process considerably. It is an amazing achievement. Thank you very much.

I have one comment to more optimization. It is not necessary but just an idea.

[NitroCao]

A slight change can now be made to speed up the process considerably. It is an amazing achievement. Thank you very much.

I have one comment to more optimization. It is not necessary but just an idea.

I just implemented the idea. BTW, which tool do you use to geneerate the detailed benchmark?

[shirou]

Awesome! This should improve performance. I really appreciate your contribution.

The tool I used is benchstat. It simply makes benchmark results easier to read.