61 lines
2.0 KiB
JavaScript
61 lines
2.0 KiB
JavaScript
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const { Worker, isMainThread, parentPort, workerData } = require('worker_threads');
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function getMinor(matrix, row, col) {
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return matrix
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.filter((_, i) => i !== row)
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.map(row => row.filter((_, j) => j !== col));
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}
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function determinant(matrix) {
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const n = matrix.length;
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if (n === 1) return matrix[0][0];
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if (n === 2) return matrix[0][0] * matrix[1][1] - matrix[0][1] * matrix[1][0];
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let det = 0;
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for (let j = 0; j < n; j++) {
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det += matrix[0][j] * determinant(getMinor(matrix, 0, j)) * (j % 2 === 0 ? 1 : -1);
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}
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return det;
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}
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function determinantParallel(matrix, numThreads) {
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return new Promise((resolve, reject) => {
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const n = matrix.length;
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if (n === 1) return resolve(matrix[0][0]);
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if (n === 2) return resolve(matrix[0][0] * matrix[1][1] - matrix[0][1] * matrix[1][0]);
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let det = 0;
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let completed = 0;
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const jobs = [];
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for (let j = 0; j < n; j++) {
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const sign = j % 2 === 0 ? 1 : -1;
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const minor = getMinor(matrix, 0, j);
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jobs.push({ minor, sign, value: matrix[0][j] });
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}
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const chunkSize = Math.ceil(jobs.length / numThreads);
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const results = Array(numThreads).fill(0);
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for (let i = 0; i < numThreads; i++) {
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const chunk = jobs.slice(i * chunkSize, (i + 1) * chunkSize);
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const worker = new Worker('./det.worker.js', { workerData: chunk });
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worker.on('message', (partialDet) => {
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results[i] = partialDet;
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completed++;
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if (completed === numThreads) {
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resolve(results.reduce((acc, val) => acc + val, 0));
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}
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});
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worker.on('error', reject);
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worker.on('exit', (code) => {
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if (code !== 0) reject(new Error(`Worker stopped with exit code ${code}`));
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});
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}
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});
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}
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module.exports = { determinant, determinantParallel };
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