cuda - Grid of thread blocks and Multiprocessor -


the cuda programing guide states:

the cuda architecture built around scalable array of multithreaded streaming multiprocessors (sms). when cuda program on host cpu invokes kernel grid, blocks of grid enumerated , distributed multiprocessors available execution capacity. threads of thread block execute concurrently on 1 multiprocessor, , multiple thread blocks can execute concurrently on 1 multiprocessor. thread blocks terminate, new blocks launched on vacated multiprocessors.

does mean if have video card of 2 multiprocessor x n-cuda cores , if launch kernel like

mykernel<<<1,n>>>(sth);

one of multiprocessors idle, since i'm launching single block of n threads?

you correct.

in currect cuda architectures, block ever scheduled , run on single multiprocessor. if run 1 block on device more 1 multiprocessor, 1 of multiprocessors idle.


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