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Does host wait for device to finish its execution compeletely? e.g. the program has the structure as follows
// cpu code segment
// data transfer from host to device
QUESTION - WILL CPU WAIT FOR DEVICE TO FINISH TRANSFER? IF NO, IS IT POSSIBLE? IF YES, HOW?
// kernel launch
QUESTION - WILL CPU WAIT FOR DEVICE TO LET IT FINISH KERNEL EXECUTION (CONSIDERING KERNEL EXECUTION WILL TAKE NOTABLE TIME say-5 sec)? IF NO, IS IT POSSIBLE? IF YES, HOW?
// data transfer from device to host
// program terminates after printing some information
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The kernel execution configuration defines the dimensions of a grid and its blocks. Unique coordinates in blockIdx and threadIdx variables allow threads of a grid to identify themselves and their domains of data.
cudaDeviceSynchronize() returns any error code of that has occurred in any of those kernels. Note that when a thread calls cudaDeviceSynchronize() , it is not aware which kernel launch constructs has been already executed by other threads in the block.
The synchronization functions of the CUDA run-time can let you achieve what you want.
cudaDeviceSynchronize():
When you call this function, the CPU will wait until the device has completed ALL its work, whether it is memory copy or kernel execution.
cudaStreamSynchronize(cudaStream):
This function will block the CPU until the specified CUDA stream has finished its execution. Other CUDA streams will continue their execution asynchronously.
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