[llvm-dev] New LLD performance builder

Galina Kistanova via llvm-dev llvm-dev at lists.llvm.org
Fri Feb 16 12:27:18 PST 2018

Hello George,

The bot does 10 runs for each of the benchmarks (those dots in the logs are
meaningful). It seems the statistics quite stable if you would look over
number of revisions.

For example, if one would take a look at the linux-kernel branches -
it gets obvious that the number of branches increased significantly as a
result of the r325313. The metric is very stable around the impacted commit.

As the number of branches has increased, the related metrics regress as
well, like branch-misses


I'm sure you have checked that, but, just in case, here is the link to the
LNT doc.

Besides reporting to the lnt.llvm.org, each build contains in the log all
the reported data, so you could process it whatever you want and find



On Fri, Feb 16, 2018 at 1:55 AM, George Rimar via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> >Hello everyone,
> >
> >I have added a new public LLD performance builder at
> >http://lab.llvm.org:8011/builders/lld-perf-testsuite.
> >It builds LLVM and LLD by the latest releaed Clang and runs a set of
> >perfromance tests.
> >
> >The builder is reliable. Please pay attention on the failures.
> >
> >The performance statistics are here:
> >http://lnt.llvm.org/db_default/v4/link/recent_activity
> >
> >Thanks
> >
> >Galina
> Great news, thanks !
> Looking on results I am not sure how to explain them though.
> For example r325313 fixes "use after free", it should not give any
> performance
> slowdowns or boosts. Though if I read results right, they show 23.65%
> slowdown
> for time of linking linux kernel (http://lnt.llvm.org/db_
> default/v4/link/104).
> I guess such variation can happen for example if bot do only single link
> iteration for tests,
> so that final time is just a error mostly probably.
> task-clock results are available for "linux-kernel" and "llvm-as-fsds"
> only and all other
> tests has blank field. Should it mean there was no noticable difference in
> results ?
> Also, "Graph" and "Matrix" buttons whatever they should do show errors atm.
> ("Nothing to graph." and "Not Found: Request requires some data
> arguments.").
> Best regards,
> George | Developer | Access Softek, Inc
> _______________________________________________
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> llvm-dev at lists.llvm.org
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