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111 lines
2.8 KiB
111 lines
2.8 KiB
// TODO: Simple matrix-vector multiplication, every thread computes a complete dot product
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//
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// i := get_global_id(0)
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//
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// IF ID < n THEN:
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// yi := b[i]
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// LOOP j := 0 .. m DO:
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// yi += A[j + i * m] * x[j]
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// END LOOP
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// y[i] := yi
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// END IF
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__kernel
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void simpleMV(const int n, const int m, __global float* y, __global float* A, __global float* x, __global float* b){
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int i = get_global_id(0);
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if (i < n) {
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float yi = b[i];
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for (int j = 0; j < m; j++) {
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yi += A[j + i * m] * x[j];
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}
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y[i] = yi;
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}
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}
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// TODO: Matrix-vector multiplication with parallelization of the dot product
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// Assumptions: M = 2^k, M <= maximum workgroup size
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//
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// i = get_group_id(0)
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// j = get_local_id(0)
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//
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// Q[j] := A[i * M + j] * x[j]
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// BARRIER
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//
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// Sum scan on Q (reduction)
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//
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// IF j = 0 THEN:
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// y[i] = Q[0] + b[i]
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//
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__kernel
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void reduceMV(const int n, const int M, __global float* y, __global float* A, __global float* x, __global float* b, __local float* Q){
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int i = get_group_id(0); // Matrix sora, workgroup ID
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int j = get_local_id(0); // Oszlop a matrixban, munkacsoporton beluli ID
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// MAP
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// Q - matrix i soranak és a vektornak elemenkenti szorzata
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Q[j] = A[i * M + j] * x[j];
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barrier(CLK_LOCAL_MEM_FENCE);
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// REDUCE
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// Lokalis memoria Q vektort Q[0]-ba redukalja összeadva
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for (size_t s = get_local_size(0) / 2; s > 0; s >>= 1) {
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if (j < s) {
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Q[j] = Q[j] + Q[j + s];
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}
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barrier(CLK_LOCAL_MEM_FENCE);
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}
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if (i == 0) {
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y[j] = Q[0] + b[j];
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}
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}
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// TODO: General solution for matrix-vector multiplication, every thread processes a chunk of the dot product and visits multiple rows of the result
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//
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// t := get_local_id(0) / Z
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// z := get_local_id(0) % Z
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//
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// FOR i := t ; i < n ; i := i + T :
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// Compute Q[t * Z + z] as shown in the lecture
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// Sum scan on Q (reduction)
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// IF z = 0 THEN:
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// y[i] = Q[t * Z + 0] + b[i]
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//
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// END FOR
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__kernel
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void largeMV(const int n, const int m, __global float* y, __global float* A, __global float* x, __global float* b, const int T, const int Z, __local float* Q){
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}
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// TODO: Gaussian elimination as shown in the lecture
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// for k := 1 .. n-1 do
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// for i : = k + 1 ..n do
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// l : = aik / akk
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// bi : = bi – l * bk
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// for j : = k ..n do
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// aij : = aij – l * akj
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// end for
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// end for
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// end for
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// (execute the 2nd loop of the sequential implemential in parallel)
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__kernel void gaussian(const int n, const int m, __global float* A){
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int i = get_global_id(0);
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int lid = get_local_id(0);
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/*if (i < n) {
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for (size_t k = 1; k < n - 1; k++) {
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int l = A[k * i] / A[k * k];
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for (size_t j = k; k < n; j++) {
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A[i * j] = A[i * j] - l * A[k * j];
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}
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}
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}*/
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for (size_t k = 1; k < n - 1; k++) {
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float l = A[k * n + i] / A[k * n + k];
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for (size_t j = k; j < n; j++) {
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A[i * n + j] = A[i * n + j] - l * A[k * n + j];
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}
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}
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}
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