Lecture 2 â Threads - many-core.group

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Update kernel - CPU // loop over all points in domain (not boundary points) for (j=1; j < nj-1; j++) { for (i=1; i < ni-1; i++) { // find indices into linear memory for this point and neighbours i00 = I2D(ni, i, j); im10 = I2D(ni, i-1, j); ... Similarly for others ... // evaluate derivatives d2tdx2 = temp_in[im10] - 2*temp_in[i00] + temp_in[ip10]; d2tdy2 = temp_in[i0m1] - 2*temp_in[i00] + temp_in[i0p1]; // update temperatures temp_out[i00] = temp_in[i00] + tfac*(d2tdx2 + d2tdy2); } }
Results Initial field After 50000 steps
Page 1 and 2: Lecture 2 - Threads Graham Pullan D
Page 3 and 4: Threads, thread blocks and shared m
Page 5 and 6: Threads • Example in L1 made no u
Page 7 and 8: Kernel for c = a + b __global__ voi
Page 9 and 10: Threads, blocks and grid Block is s
Page 11 and 12: More on thread blocks • Thread bl
Page 13 and 14: Streaming multiprocessors and share
Page 15 and 16: Governing equation • Heat conduct
Page 17 and 18: 2D heat conduction • In 2D: ∂T
Page 19: Domain
Page 23 and 24: GPU strategy 1 • Start a thread f
Page 25 and 26: GPU strategy 1 - threads and blocks
Page 27 and 28: GPU strategy 1 - kernel launch code
Page 29 and 30: Performance • CPU - 1 core, Intel
Page 31 and 32: GPU strategy 2 - threads and blocks
Page 33 and 34: GPU strategy 2 - kernel (part 1) //
Page 35 and 36: Performance • CPU - 1 core, Intel
Page 37 and 38: GPU strategy 3 • Can use larger b
Page 39 and 40: GPU strategy 3
Page 45 and 46: Lecture 2 summary

Lecture 2 â Threads - many-core.group

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Lecture 2 â Threads - many-core.group