[Openmp-dev] Offloading application build with a Trunk Debug Clang is so slow

Itaru Kitayama via Openmp-dev openmp-dev at lists.llvm.org
Sat Dec 21 17:13:38 PST 2019


On x86 I see the same significant slowdown when building an app with Debug
Clang.

Does make check-openmp exercise any part of the offloading features?

On Fri, Dec 20, 2019 at 8:35 AM Doerfert, Johannes <jdoerfert at anl.gov>
wrote:

> On 12/19, Itaru Kitayama wrote:
> > On POWER8, my app builds 40 minutes with the Debug Clang (40 times
> increase
> > of time, when
> > it is built with Release Clang), but on an x86 host, it just takes about
> 10
> > minutes and it is bearable.
> >
> > Could this be PowerPC specific, is it why most people aren't aware of the
> > slowness?
>
> That could most certainly be. Alexey should build on Power regularly
> though.
>
>
>
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