title: Where GPU read/write data
body: <p>I am trying to understand below lines from <a href="https://www.mathworks.com/help/parallel-computing/measuring-gpu-performance.html" rel="nofollow noreferrer">here</a></p>
  <p><strong>How quickly can data be sent to the GPU or read back from it?</strong></p>
  <p><strong>How fast can the GPU kernel read and write data?</strong></p>
  <p>How quickly can data be sent to the GPU? Which peripheral device sent data to GPU? Where GPU kernel read and write data? to the data bus?</p>
  <p>Is <a href="https://www.mathworks.com/help/parallel-computing/measuring-gpu-performance.html" rel="nofollow noreferrer">this</a> implementation showing us how everything [GPU and other peripheral devices] contribute towards computation performance?</p>