net.myrrix.common.math.SolverLoadTest.java Source code

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Here is the source code for net.myrrix.common.math.SolverLoadTest.java

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/*
 * Copyright Myrrix Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.myrrix.common.math;

import java.util.concurrent.TimeUnit;

import com.google.common.base.Stopwatch;
import org.apache.commons.math3.linear.Array2DRowRealMatrix;
import org.apache.commons.math3.linear.RealMatrix;
import org.apache.commons.math3.random.RandomGenerator;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import net.myrrix.common.MyrrixTest;
import net.myrrix.common.random.RandomManager;

/**
 * Tests performance of {@link LinearSystemSolver#getSolver(RealMatrix)}.
 * 
 * @author Sean Owen
 */
public final class SolverLoadTest extends MyrrixTest {

    private static final Logger log = LoggerFactory.getLogger(SolverLoadTest.class);

    @Test
    public void testLoad() {
        RealMatrix symmetric = randomSymmetricMatrix(500);
        Stopwatch stopwatch = new Stopwatch().start();
        int iterations = 100;
        for (int i = 0; i < iterations; i++) {
            MatrixUtils.getSolver(symmetric);
        }
        stopwatch.stop();
        long elapsedMS = stopwatch.elapsed(TimeUnit.MILLISECONDS);
        log.info("{}ms elapsed", elapsedMS);
        assertTrue(elapsedMS < 300 * iterations);
    }

    private static RealMatrix randomSymmetricMatrix(int dimension) {
        RandomGenerator random = RandomManager.getRandom();
        RealMatrix symmetric = new Array2DRowRealMatrix(dimension, dimension);
        for (int j = 0; j < dimension; j++) {
            // Diagonal
            symmetric.setEntry(j, j, random.nextDouble());
            for (int k = j + 1; k < dimension; k++) {
                // Off-diagonal
                double d = random.nextDouble();
                symmetric.setEntry(j, k, d);
                symmetric.setEntry(k, j, d);
            }
        }
        return symmetric;
    }

}