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CUDA, Supercomputing for the Masses: Part 17

CUBLAS and CUFFT Enhancements

CUBLAS users will be happy that complex numbers are now supported. The release notes indicate the following routines have been added:

  • BLAS1

    • cublasZaxpy()
    • cublasZcopy()
    • cublasZswap()

  • BLAS2
    • cublasDtrmv()
    • cublasCtrmv()
    • cublasCgemv()
    • cublasCgeru()
    • cublasCgerc()
    • cublasZtrmv()
    • cublasZgemv()
    • cublasZgeru()
    • cublasZgerc()

  • BLAS3
    • cublasCtrsm()
    • cublasCtrmm()
    • cublasCsyrk()
    • cublasCsymm()
    • cublasCherk()
    • cublasZtrsm()
    • cublasZtrmm()
    • cublasZsyrk()
    • cublasZsymm()
    • cublasZherk()

The site oscarbg.blogspot notes that batched 2D and 3D transforms are supported in CUFFT with the new cufftPlanMany() API. This is defined in cufft.h, as follows:

cufftResult CUFFTAPI cufftPlanMany(cufftHandle *plan, 
        int rank,
   	int *n,
        int *inembed,    // Unused: pass NULL
        int istride,     // Unused: pass 1
        int idist,       // Unused: pass 0
        int *onembed,    // Unused: pass NULL
        int ostride,     // Unused: pass 1
        int odist,       // Unused: pass 0
        cufftType type,
        int batch);

The arguments are:

*plan -- The plan is returned here, as for other cufft calls

rank --The dimensionality of the transform (1, 2 or 3)

*n -- An array of size [rank], describing the size of each dimension

type -- Transform type (e.g. CUFFT_C2C), as per other CUFFT calls

batch -- Batch size for this transform

Return values are as for all other cufftPlan…() functions. Creating a plan for 1,000 2D double-precision, complex-to-complex transforms of size (128, 256) will look something like the following:

cufftHandle *myplan;
cufftPlanMany(myplan, 2, {128, 256}, NULL, 1, 0, NULL, 1, 0, CUFFT_Z2Z, 1000);

Note that for CUFFT 3.0, the layout of batched data must be side-by-side and not interleaved. The inembed, istride, idist, onembed, ostride, and odist parameters are for enabling data windowing and interleaving in a future version.

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