[Openmp-dev] Target architecture does not support unified addressing

[Itaru Kitayama via Openmp-dev]

Can you say briefly as to why SM60, while it is capable of handing unified
addresses, is not supported in Clang?

On Wed, Nov 6, 2019 at 7:56 AM Alexey Bataev <a.bataev at outlook.com> wrote:

> Yes, it is enforced in clang.
>
> Best regards,
> Alexey Bataev
>
> 5 нояб. 2019 г., в 17:38, Itaru Kitayama <itaru.kitayama at gmail.com>
> написал(а):
>
> 
> Thank you, Alexey. Now I am seeing:
>
> $ clang++ -fopenmp -fopenmp-targets=nvptx64 tmp.cpp
> tmp.cpp:1:22: error: Target architecture sm_60 does not support unified
> addressing
> #pragma omp requires unified_shared_memory
>                      ^
> 1 error generated.
>
> P100 is a SM60 device, but supports unified memory. Is a requirement sm_70
> equals or greater
> enforced in Clang?
>
> On Wed, Nov 6, 2019 at 5:07 AM Alexey Bataev <a.bataev at outlook.com> wrote:
>
>> Most probably, you use default architecture, i.e. sm_35. You need to
>> build clang with sm_35, sm_70, ... supported archs. Plus, your system must
>> support unified memory.
>>
>> I updated error message in the compiler, now it says what target
>> architecture you use .
>>
>> -------------
>> Best regards,
>> Alexey Bataev
>>
>> 05.11.2019 3:01 PM, Itaru Kitayama пишет:
>>
>> I’ve been building trunk Clang locally targeting the P100 device attached
>> to Host. Should I check the tool chain?
>>
>> On Tue, Nov 5, 2019 at 23:47 Alexey Bataev <a.bataev at outlook.com> wrote:
>>
>>> You're building you code for the architecture that does not support
>>> unified memory, say sm_35. Unified memory only supported for architectures
>>> >= sm_70.
>>>
>>> -------------
>>> Best regards,
>>> Alexey Bataev
>>>
>>> 05.11.2019 3:16 AM, Itaru Kitayama via Openmp-dev пишет:
>>>
>>> Hi,
>>> Using a pragma like below:
>>>
>>> $ cat tmp.cpp
>>> #pragma omp requires unified_shared_memory
>>>
>>> int main() {
>>> }
>>>
>>> produces en error on a POWER8 based system with P100 devices (that
>>> support unified memory).
>>>
>>> $ clang++ -fopenmp -fopenmp-targets=nvptx64 tmp.cpp
>>> tmp.cpp:1:22: error: Target architecture does not support unified
>>> addressing
>>> #pragma omp requires unified_shared_memory
>>>                      ^
>>> 1 error generated.
>>>
>>> The Clang is locally and natively built with the appropriate capability,
>>> so
>>> what does this mean?
>>>
>>>
>>> _______________________________________________
>>> Openmp-dev mailing listOpenmp-dev at lists.llvm.orghttps://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
>>>
>>>
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