[Buildbot-devel] large variability in slave compile times -- trying to optimize

[Dustin J. Mitchell]

On Fri, Jun 24, 2011 at 6:26 PM, Philippe McLean
<philippe.mclean at gmail.com> wrote:
> I think we may be swapping on the VM host ... I will update when I have more
> information.
>
> FTR, assigning multiple cores to a vm does not substantially improve build
> times under devenv.com (even when multi processing is enabled).
> With a 2-core vm (under vmware fusion), I see 8:32 build time; with 1 core,
> I see 9:35 build time.

At Mozilla we've noted a long time ago that the MS compilers have a
single-threaded linker, so you don't gain much from throwing extra
CPUs at it.

Dustin