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

[Itaru Kitayama via Openmp-dev]

I've collected Clang build performance data with the -ftime-trace like below

clang++ -ftime-trace -g -fopenmp -fopenmp-targets=nvptx64 mini.cpp

. I'm uploading corresponding .json files for your review as to why the
latest Clang is slow.

On Sun, Dec 22, 2019 at 10:23 AM Alexey Bataev <a.bataev at hotmail.com> wrote:

> Check-libomptarget and check-libomptarget-nvptx  do.
>
> Best regards,
> Alexey Bataev
>
> 21 дек. 2019 г., в 20:13, Itaru Kitayama via Openmp-dev <
> openmp-dev at lists.llvm.org> написал(а):
>
> 
> 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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> Openmp-dev at lists.llvm.org
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>
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