/*
* 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;
}
}