[llvm-dev] New LLD performance builder

[Rafael Avila de Espindola via llvm-dev]

Galina Kistanova <gkistanova at gmail.com> writes:

> Disabling swap and having a single CPU in the shield group didn't change
> much, besides cpu-migrations and context-switches, which now are 0
> obviously.
> That clustering remains the same. It is also stable to the number of runs
> (I have changed the test to run 20 times in the middle of that range on the
> right).
>
> http://lnt.llvm.org/db_default/v4/link/graph?highlight_run=426&plot.9=1.9.6
>
> Unless somebody has a good idea what else we should try, it seems we have
> it as good as it could be with the current approach.

I am benchmarking a patch and just remembered one thing: cset will only
enable the shield if run as root, but it will still run the program
outside otherwise.

Is the benchmark being run as root? if not that might explain the large
variations from run to run.

Cheers,
Rafael