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Asked: 2026-06-11T23:38:35+00:00

Does host wait for device to finish its execution compeletely? e.g. the program has

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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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1 Answer

  1. Editorial Team

    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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