[Openmp-dev] Mapped without a warning, but device code fails at run time

[Alexey Bataev via Openmp-dev]

Yes, this looks like as more correct solution though there might be some problems with deep copy mapping of inner pointers in the structure.

Best regards,
Alexey Bataev

5 нояб. 2019 г., в 21:16, Itaru Kitayama <itaru.kitayama at gmail.com> написал(а):


Alexey,

A change like this:

map(to: c[0:1]), here c is a pointer

made the program run on the device. We're inspired about this from page 32 of the presentation:
https://ukopenmpusers.co.uk/wp-content/uploads/uk-openmp-users-2018-OpenMP45Tutorial_new.pdf


On Mon, Nov 4, 2019 at 6:36 PM Alexey Bataev <a.bataev at hotmail.com<mailto:a.bataev at hotmail.com>> wrote:
I rather doubt there is a bug in the compiler. The code maps the pointer and then tries to call a member function using this pointer. It will work only with unified memory, I think. If the program does not rely on the unified memory, the program is not correct, since it doea not offload the data itself.

Best regards,
Alexey Bataev

> 4 нояб. 2019 г., в 02:42, Doerfert, Johannes via Openmp-dev <openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>> написал(а):
>
> Got it this time (attached again for the list), thanks!
>
> After a brief look, I think we need to open a bug for this. If the behavior is as you described, it is a problem we need to fix.
>
> ________________________________________
> From: Itaru Kitayama <itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com>>
> Sent: Monday, November 4, 2019 01:36
> To: Doerfert, Johannes
> Subject: Re: [Openmp-dev] Mapped without a warning, but device code fails at run time
>
> I've attached the reproducer. Thanks,
>
> On Mon, Nov 4, 2019 at 4:27 PM Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>>> wrote:
> This sounds like a bug. Changing a type should not only impact runtime
> offloading behavior (with exceptions).
>
> I fail to locate the attachment, could you resend or put it somewhere
> online?
>
> Thanks,
>  Johannes
>
>> On 11/04, Itaru Kitayama wrote:
>> In the attached code, if I remove the protected member, syn_id_delay_ from
>> the class definition, it runs on the device.
>>
>> On Tue, Oct 29, 2019 at 7:40 AM Itaru Kitayama <itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com><mailto:itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com>>>
>> wrote:
>>
>>> Hi,
>>> How do I enable debug messages at run time?
>>> I've attached a small reproducer for you to take a look at it.
>>>
>>> On Tue, Oct 29, 2019 at 3:42 AM Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>>>
>>> wrote:
>>>
>>>> This can have various reasons, including a compiler bug.
>>>> Try to enable debug messages by the runtime and see if that helps to
>>>> determine why offloading failed.
>>>> You can also provide a small reproducer so we can take a look.
>>>>
>>>> ________________________________________
>>>> From: Openmp-dev <openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org><mailto:openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org>>> on behalf of Itaru
>>>> Kitayama via Openmp-dev <openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>>>
>>>> Sent: Monday, October 21, 2019 22:20
>>>> To: openmp-dev
>>>> Subject: [Openmp-dev] Mapped without a warning, but device code fails at
>>>> run time
>>>>
>>>> Hi,
>>>> By checking the compiler message, a type is mapped without triggering
>>>> a Non-trivial type ... warning, but the device code fails at the run time
>>>> leaving:
>>>>
>>>> Libomptarget fatal error 1: failure of target construct while offloading
>>>> is mandatory
>>>>
>>>> (in the code accessing an element in a user-defined "vector")
>>>> in this case, should I worry about a possible compiler bug?
>>>>
>>>
>
> --
>
> Johannes Doerfert
> Researcher
>
> Argonne National Laboratory
> Lemont, IL 60439, USA
>
> jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>>
> <my1.cpp>
> _______________________________________________
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