parameters for use_device() openACC

Question

Is it allowed to pass objects instead of a pointer to the following directive

pragma acc host_data use_device(myobject)

here is the code , Pn is the object and Pn.P is the pointer to the array where data is stored

#pragma acc data pcopyin( rank,N )
{
#pragma acc host_data use_device( Pn )
    {


        cufftPlan1d( &plan, 1000 , CUFFT_Z2Z, 1 );

        cufftExecZ2Z( plan, (cufftDoubleComplex*)Pn.P, (cufftDoubleComplex *)Pn.P, CUFFT_FORWARD );

     
    }
}

runing gives Seg Fault

score 1 · Answer 1 · answered Feb 22 '18 at 22:37

1

Try "host_data use_device( Pn.P )" so that "P"'s device address is used.

When you pass "Pn.P" as an argument, you're accessing "Pn" on the host to get the address of "P". Hence by putting "Pn" in the host_data region, the code is using the device address which in turn causes the segv.

answered Feb 22 '18 at 22:37

Mat Colgrove

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I tried it actually, the compiler does not like it , it gives the follwoing error error: expected a ")" #pragma acc host_data use_device( Pn.P ) – JimBamFeng Feb 22 '18 at 22:51
Can you post a reproducer or send one to PGI Customer Service (trs@pgroup.com) and ask them to forward it to me? – Mat Colgrove Feb 23 '18 at 15:42
sure, will do it today – JimBamFeng Feb 23 '18 at 16:33

score 0 · Answer 2 · answered Mar 02 '18 at 16:02

0

using version PGI 18.1 solves this issue

answered Mar 02 '18 at 16:02

JimBamFeng

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parameters for use_device() openACC

pragma acc host_data use_device(myobject)

2 Answers2