[llvm-dev] [RFC] Adding time-trace to LLD?

David Major via llvm-dev llvm-dev at lists.llvm.org
Wed Oct 16 10:16:24 PDT 2019

The COFF flavor of lld has an option to show basic timing information on
stdout: https://llvm.org/r322736. I enabled it on my project's CI and find
it quite useful in logs. I'd be happy to see it ported to ELF.

>From looking at the screenshot on your review, it looks like your proposal
provides much richer information, but the extra friction of opening a json
file (and pulling it off our builders) means I'd be less inclined to reach
for this feature unless I was debugging a specific issue. I guess it
depends on whether you're going for day-to-day health monitoring or
targeted problem-solving.

On Wed, Oct 16, 2019 at 11:34 AM Russell Gallop via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
> I've been using -ftime-trace on the compiler and find it very useful for
> analysing compile times and whole build times. I've made a first attempt at
> adding this to LLD (ELF) so link times can be traced in the same way:
> https://reviews.llvm.org/D69043
> This works for LTO and ThinLTO, but needs some more work to make sure it
> scales well across multiple threads.
> Please let me know whether you think this is worth pursuing?
> Thanks
> Russ
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20191016/f20ea417/attachment.html>

More information about the llvm-dev mailing list