On 23/09/2013 2:46 PM, Gregory Szorc wrote:
On Sep 22, 2013, at 18:20, Mark Hammond <mhamm...@skippinet.com.au>
wrote:
On 23/09/2013 11:04 AM, Gregory Szorc wrote:
On Sep 22, 2013, at 16:35, Anthony Jones <ajo...@mozilla.com>
wrote:
On 21/09/13 17:58, Robert O'Callahan wrote:
I don't think that's necessarily true on Windows. If we can
find a way to generate Visual Studio projects and use those
to build, or do most of the build, we can probably go a lot
faster than using cl command-line invocations compiling one
file per invocation.
It would be nice to see multiple files per cl invocation. That
would likely be a significant win for Windows. The performance
improvements are good for Linux but Windows build performance
still lags many minutes behind the Linux.
Not sure what you mean here.
In my experience, a clobber build on Windows does not fully utilize
the CPU - for most of the build, many cores are simply not being
used. It might technically be "CPU bound", but it's certainly not
"CPU efficient".
I suspect Roc was suggesting there might still be opportunities to
increase the parallelism of the build that would offer significant
wins on Windows.
The patches announced in the first post on this thread offer such a
solution. They work with GNU make and pymake and can saturate a 64+
core machine.
That's great - however, I was just responding to your comment that
"clobber builds are mostly CPU bound today" and pointing out that,
today, that comment doesn't match my experiences.
[I also see a clobber build spend > 5 minutes in various configure
runs, which frustrates me every time I see it - so I minimize the
shell ;]
We don't have much love for configure either. However, it's only
contributing a few extra minutes to Windows builds compared with 15+
minutes that pymake and make traversal is. I hope you understand why
fixing configure isn't at the top of the priority list at the
moment.
I understand it isn't at the top of the priority list, but it's still
worth keeping it in perspective - I see ~6 minutes of configure for ~30
mins total build time - 20% is significant in anyone's language.
Cheers,
Mark
_______________________________________________
dev-platform mailing list
dev-platform@lists.mozilla.org
https://lists.mozilla.org/listinfo/dev-platform
