[llvm-dev] LLD: time to enable --threads by default

Rui Ueyama via llvm-dev
Thu, 17 Nov 2016 01:26:23 -0000

Did you see this
http://llvm.org/viewvc/llvm-project?view=revision&revision=287140 ?
Interpreting these numbers may be tricky because of hyper threading, though.

On Wed, Nov 16, 2016 at 5:15 PM, Joerg Sonnenberger via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> On Wed, Nov 16, 2016 at 12:44:46PM -0800, Rui Ueyama via llvm-dev wrote:
> > I'm thinking to enable --threads by default. We now have real
users, and
> > they'll be happy about the performance boost.
> >
> > Any concerns?
>
> What is the total time consumped, not just the real time? When building
> a large project, linking is often done in parallel with other tasks, so
> wasting a lot of CPU to save a bit of real time is not necessarily a net
> win.
>
> Joerg
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