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

[Itaru Kitayama via Openmp-dev]

Yes, that's right.

On Tue, Jan 7, 2020 at 5:24 Alexey Bataev <a.bataev at outlook.com> wrote:

> You mean, the NEST is crashing on startup?
>
> -------------
> Best regards,
> Alexey Bataev
>
> 06.01.2020 3:23 PM, Itaru Kitayama пишет:
>
> Alexey, I was saying that Initializing offloading rum time at runtime was
> failing with NEST.
>
> On Tue, Jan 7, 2020 at 1:47 Alexey Bataev <a.bataev at outlook.com> wrote:
>
>> Hi Itaru, I tried to build the NEST with offloading support. It is built
>> successfully. How can I see that it does not work?
>>
>> -------------
>> Best regards,
>> Alexey Bataev
>>
>> 05.01.2020 8:53 PM, Itaru Kitayama пишет:
>>
>> Hi all,
>> From discussions I had in the llvm-dev mailing list, I realized thjat I
>> really should not have used a Debug Clang at all for my
>> app build. Although at this moment, trunk is broken for my application of
>> interest, I can go back to mid October of trunk and
>> I can build my app with the Clang which is a Release build, but also
>> configured to print informative messages from libomptarget.
>>
>>
>> On Mon, Dec 23, 2019 at 12:47 PM Itaru Kitayama <itaru.kitayama at gmail.com>
>> wrote:
>>
>>> 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.
>>>>>
>>>>>
>>>>> _______________________________________________
>>>> Openmp-dev mailing list
>>>> Openmp-dev at lists.llvm.org
>>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
>>>>
>>>>
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