Error creating CUDPPPlan after changing data structure

[Jilang Miao]

Hi, 

My program could run normally and correctly. 

But after I change an array from array of structure (ea,rt,ra,rf; ea,rt,ra,rf; ea,rt,ra,rf; .....) to structure of array (ea,ea,......ea; rt,rt,....rt; ra,ra,ra,...ra; rf,rf,rf....rf), I got error "Error creating CUDPPPlan". 

Even in this case, "Error creating CUDPPPlan" doesn't come out every time. Sometimes the program runs normally, sometimes it gives the error. And if I make dimBlock and dimGrid very small, the error still occurs. 

Any idea?

Thanks!

Jilang

[John Owens]

What CUDPP primitive are you actually running?

JDO

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[Jilang Miao]

Radix sort

[John Owens]

We don’t support sorts of arbitrary datatypes. CUDPP currently just calls thrust sort anyway; you might just want to call it directly (I think it supports a wider range of datatypes than CUDPP allows).

JDO

[Jilang Miao]

    CUDPPHandle theCudpp;
    cudppCreate(&theCudpp);
    CUDPPConfiguration config;
    config.datatype = CUDPP_DOUBLE;

    config.algorithm = CUDPP_SORT_RADIX;


    CUDPPHandle sortplan = 0;
    CUDPPResult res = cudppPlan(theCudpp, &sortplan, config, gridsize, 1, 0);


    if (CUDPP_SUCCESS != res)
    {
        printf("Error creating CUDPPPlan\n");
        exit(-1);
    }


    res = cudppRadixSort(sortplan, DeviceMem.nInfo.energy, DeviceMem.nInfo.id, gridsize);
                                                  //double keys                   //unsigned int values
    if (CUDPP_SUCCESS != res)
    {
        printf("Error in cudppSort()\n");
        exit(-1);
    }


  res = cudppDestroyPlan(sortplan);
  if (CUDPP_SUCCESS != res)
  {
      printf("Error destroying CUDPPPlan\n");
      exit(-1);
  }
  cudppDestroy(theCudpp);

I sort double keys, that are supported by CUDPP2.1. 

My problem is for the same program accepting same input cudppsort() runs sometimes normally sometimes fails at cudppPlan(). 

I'm asking for your ideas what could happen in cudppPlan() that causes the error. 

Thanks!

[John Owens]

It would help a lot if you could get a stack trace of where it’s having the error …

Alternatively, if you could add a test (say, a radix sort of doubles of the size that’s calling the error) to the tests in app/cudpp_testrig/test_radixsort.cpp, that would be equally helpful.

JDO