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POGPU reads from CPU or CPU writes to the GPU?
 

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    <p>I am beginner in parallel programming. I have a query which might be seem to be silly but I didn't get a definitive answer when I googled it out. </p> <p>In GPU computing there is a device i.e. the GPU and the host i.e. the CPU. I wrote a simple hello world program which will allocate some memory on the gpu, pass two parameters (say src[] and dest[]) to the kernel, copy src string i.e. Hello world to dest string and get the dest string from gpu to the host. </p> <p>Is the string "src" read by the GPU or the CPU writes to the GPU ? Also when we get back the string from GPU, is the GPU writing to the CPU or the CPU reading from the GPU?</p> <p>In transferring the data back and forth there can be four possibilities 1. CPU to GPU - CPU writes to GPU - GPU reads form CPU 2. GPU to CPU - GPU writes to the CPU - CPU reads from GPU</p> <p>Can someone please explain which of these are possible and which are not?</p>
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