On Mon, Nov 18, 2013 at 11:15:16PM -0800, Gregory Szorc wrote:
> Do builds feel like they've gotten faster in the last few weeks^hours?
> It's because they have.
>
> When I did my MacBook Pro comparison [1] with a changeset from Oct 28,
> build times on my 2013 2.6 GHz MacBook Pro were as follows:
>
> Wall 11:13 (673)
> User 69:55 (4195)
> Sys 6:04 (364)
> Total 75:59 (4559)
>
> I just built the tip of m-c (e4b59fdbc9c2) and times on that same
> machine are now:
>
> Wall 9:23 (563)
> User 57:38 (3458)
> Sys 4:58 (298)
> Total 62:36 (3756)
>
> That's a 17.6% drop in CPU time required to build the tree! If the build
> system were able to deliver 100% CPU utilization, my machine would be
> able to build the tree in ~7:50 wall time. Not too shabby!
>
> I can say with high confidence that unified sources are mostly
> responsible for the CPU efficiency gains. When I built m-c earlier today
> just after Australis landed, total CPU time was at 66:28. In between, 5
> unified sources bugs landed and ~4 minutes total CPU time was shaved off.
>
> Project unified sources: making builds insanely faster since yesterday.
>
> I can't wait to see what tomorrow brings.
Just because my build machine (older and slower than your mac) was bored
last night:
$ hg up -C -r 'date("2013-08-01")'
$ ./mach clobber && time ./mach build > /dev/null
real 25m36.250s
user 143m19.573s
sys 8m14.883s
$ hg up -C -r 'date("2013-09-01")'
$ ./mach clobber && time ./mach build > /dev/null
real 22m15.830s
user 122m46.584s
sys 6m49.058s
$ hg up -C -r 'date("2013-10-01")'
$ ./mach clobber && time ./mach build > /dev/null
real 17m41.810s
user 116m21.284s
sys 6m8.659s
$ hg up -C -r 'date("2013-11-01")'
$ ./mach clobber && time ./mach build > /dev/null
real 17m36.424s
user 109m38.891s
sys 5m58.714s
$ hg up -C -r tip
$ ./mach clobber && time ./mach build > /dev/null
real 14m23.843s
user 86m57.834s
sys 4m45.118s
(All linux builds with mk_add_options MOZ_MAKE_FLAGS=-j12)
The corresponding sizes are respectively:
objdir libxul (text+data+bss)
6.1G 877M (59.9M)
5.6G 800M (62.6M)
5.3G 752M (62.8M)
5.2G 727M (62.7M)
4.7G 602M (65.0M)
In less than 4 months, clobber build time on my machine has decreased by ~44%,
objdir size by ~22%, and DWARF size (approximated by libxul-(text+data+bss))
by ~34%.
Mike
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