[Openmp-dev] Target CUDA RTL --> CUDA error is: an illegal memory access was encountered

[Alexey Bataev via Openmp-dev]

Yes, it works, since you're actually don't use mapped data. Instead you create the local one, which can be used directly without any issues. Local objects should work fine,but not the mapped ones.

Best regards,
Alexey Bataev

14 янв. 2020 г., в 23:17, Itaru Kitayama <itaru.kitayama at gmail.com> написал(а):


#include <stdio.h>

class Base {
public:
        virtual int f() { return 2;}
};
class D : public Base {
public:
        int f() { return 1234; }
};

int main() {
        D *d = new D();
#pragma omp target parallel for map(to: d[0:1])
        for (int i=0;i<10;i++) {
                D d1(*d);
                printf("arr[0] is %d\n", d1.f());
        }
}

The above works even though an instance of class D is not a trivially mappable type.

On Wed, Jan 15, 2020 at 2:32 PM Alexey Bataev <a.bataev at hotmail.com<mailto:a.bataev at hotmail.com>> wrote:
And it should fail since you're mapping non trivially copyable type.

Best regards,
Alexey Bataev

14 янв. 2020 г., в 19:14, Itaru Kitayama <itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com>> написал(а):


This piece of C++ program execution fails at run time.

#include <stdio.h>

class AbsBase {
public:
        virtual int f() = 0;
};

class Derived : public AbsBase {
private:
        int *arr = new int[100];
public:
        int f() { return arr[0]; }
        void fillarray() {
                arr[0] = 1234;
        }
};

int main() {
        AbsBase *absBase = new Derived();
        static_cast<Derived*>(absBase)->fillarray();
#pragma omp target parallel for map(to: absBase[0:1])
        for (int i=0;i<10;i++) {
                Derived d1(*static_cast<Derived*>(absBase));
                printf("arr[0] is %d\n", d1.f());
        }
}

On Sun, Jan 12, 2020 at 1:45 PM Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>> wrote:
On 01/12, Itaru Kitayama wrote:
> Do you guys have a timeframe for that feature
> Implemented?

I do not and I don't know anyone who will drive this right now.

As mentioned before, you should be able to "move/copy-create" the
elements on the device in order to use virtual functions.


> On Sun, Jan 12, 2020 at 12:51 Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>> wrote:
>
> > On 01/11, Alexey Bataev via Openmp-dev wrote:
> > > Virtual functions are not supported.
> >
> > Not yet ;).
> >
> > We'll get it with 5.1 so we might actually implement it soon. Till then,
> > you have to create the object on the device you call the virtual
> > function.
> >

--

Johannes Doerfert
Researcher

Argonne National Laboratory
Lemont, IL 60439, USA

jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/openmp-dev/attachments/20200115/289bbef5/attachment.html>