CUDA and CUBLAS initialization using MAGMA

[jgpallero]

Hello:

In the files in testing directory of MAGMA can I see that before to use the functions the macro TESTING_CUDA_INIT() is called. This macro is defined in testings.h as

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#define TESTING_CUDA_INIT()                                                \
  CUdevice  dev;                                                        \
  CUcontext context;                                                        \
  if( CUDA_SUCCESS != cuInit( 0 ) ) {                                        \
    fprintf(stderr, "CUDA: Not initialized\n" ); exit(-1);                \
  }                                                                        \
  if( CUDA_SUCCESS != cuDeviceGet( &dev, 0 ) ) {                        \
    fprintf(stderr, "CUDA: Cannot get the device\n"); exit(-1);                \
  }                                                                        \
  if( CUDA_SUCCESS != cuCtxCreate( &context, 0, dev ) ) {                \
    fprintf(stderr, "CUDA: Cannot create the context\n"); exit(-1);        \
  }                                                                        \
  if( CUBLAS_STATUS_SUCCESS != cublasInit( ) ) {                        \
    fprintf(stderr, "CUBLAS: Not initialized\n"); exit(-1);                \
  }                                                                        \
  printout_devices( );

My question is, is mandatory to initialize CUDA for use MAGMA or could only CUBLAS initialized as

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if( CUBLAS_STATUS_SUCCESS != cublasInit( ) ) {                        \
    fprintf(stderr, "CUBLAS: Not initialized\n"); exit(-1);                \
  }   

??

Thanks

[mgates3]

Yes, we currently recommend initializing as in the testings.h file. At the moment, a number of MAGMA functions call the CUDA driver API (functions starting with cu instead of cuda). cuInit() and cuCtxCreate() must be called before calling the CUDA driver API. In a future release, MAGMA's use of these functions will likely disappear.
-mark

[mgates3]

In MAGMA 1.2.1, the driver routines were eliminated from MAGMA, so the initialization is simpler now. Just call cublasInit(). This is reflected in the testings.h file.
-mark