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46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
/***************************************************************************
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Copyright (c) 2022-2023, Advanced Micro Devices, Inc. All rights reserved.
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***************************************************************************/
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#include "Jacobi.hpp"
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//Jacobi iterative method
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// U = U + D^{-1}*(RHS - AU)
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__global__ void JacobiIterationKernel(const int N,
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const dfloat dx,
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const dfloat dy,
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const dfloat *__restrict__ RHS,
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const dfloat *__restrict__ AU,
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dfloat *__restrict__ RES,
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dfloat *__restrict__ U) {
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const int id = threadIdx.x+blockIdx.x*blockDim.x;
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if (id<N) {
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dfloat r_res = RHS[id] - AU[id];
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RES[id] = r_res;
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U[id] += r_res/(2.0/(dx*dx) + 2.0/(dy*dy));
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}
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}
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void JacobiIteration(grid_t& grid, mesh_t& mesh,
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hipStream_t stream,
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dfloat* d_RHS,
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dfloat* d_AU,
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dfloat* d_RES,
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dfloat* d_U) {
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int xthreads = 512;
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dim3 threads(xthreads,1,1);
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dim3 blocks((mesh.N+xthreads-1)/xthreads, 1, 1);
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hipLaunchKernelGGL(JacobiIterationKernel,
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blocks,
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threads,
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0, stream,
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mesh.N,
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mesh.dx, mesh.dy,
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d_RHS, d_AU, d_RES, d_U);
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}
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