Fast binding generation by batching several files at once

[Basuke Suzuki]

Bindings generation spawns sub processes for each idl files, but fork/exec pattern is very slow on Windows. To reduce the process generation, control script can pass several files at once to the process.

Here is a statistics for 796 idl files:

Current imprementation: 386 secs
Batching 10 files:       63 secs
Aggressive approach:     36 secs (rest of files / number of process)

[Basuke Suzuki]

Created attachment 327472 [details]
patch

[Basuke Suzuki]

Created attachment 327708 [details]
fix

[Alex Christensen]

I'm ok with this as long as Sam doesn't object.

[Alex Christensen]

Comment on attachment 327708 [details]
fix

View in context: https://bugs.webkit.org/attachment.cgi?id=327708&action=review

> Source/WebCore/bindings/scripts/generate-bindings-all.pl:167
> +    my $batchCount = 30;
> +    # my $batchCount = int(($totalCount - $currentCount) / $numOfJobs) || 1;

Let's not comment out a line.  Also, the second line isn't quite right either.  As it is it strangely gives smaller batches as work progresses.  Let's do something more like $totalCount / $numOfJobs.

[Basuke Suzuki]

Created attachment 328537 [details]
fixed

fixed as Alex reviewed.

[WebKit Commit Bot]

Comment on attachment 328537 [details]
fixed

Clearing flags on attachment: 328537

Committed r225565: <https://trac.webkit.org/changeset/225565>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/35896591>