[llvm-dev] New LLD performance builder

[Rafael Avila de Espindola via llvm-dev]

Galina Kistanova <gkistanova at gmail.com> writes:

> Yep. They are still clustered.
>
>>  Is there anything else running on the machine while the tests are run?
>
> Not much. The usual buildslave stuff - buildbot, ssh server, some light
> network services, snmp client, but that's pretty much it. 20 hardware
> threads are designated for this.
>
> The test runs on designated for tests only 10 CPUs shielded.
> There only perf and lld runs. All the obj files for the tests and the
> linker itself are on tmpfs, so no disk I/O is involved. Swap file is
> (almost) empty - few MBs is in use.
>
> It might be that different CPUs gets used for different test runs, as the
> script starts each run from the scratch. Just a guess. I will look in to
> this closer.
> I'll take the bot off line to see if having perf running the tests multiple
> times would give a better result. And would try to reduce the number of
> designated CPUs to see how that would affect the numbers as well.

The HT siblings are disabled, right?

It is probably a good idea to experiment with disabling swap and having
a single cpu in the shield group.

Thanks,
Rafael