| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.geode.perftest.yardstick.hdrhistogram; |
| |
| |
| import static java.util.concurrent.TimeUnit.SECONDS; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.concurrent.TimeUnit; |
| import java.util.function.Consumer; |
| |
| import org.HdrHistogram.Histogram; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.yardstickframework.BenchmarkConfiguration; |
| import org.yardstickframework.BenchmarkDriver; |
| import org.yardstickframework.BenchmarkExecutionAwareProbe; |
| import org.yardstickframework.BenchmarkProbePoint; |
| import org.yardstickframework.BenchmarkTotalsOnlyProbe; |
| |
| /** |
| * Probe which returns generates throughput and latency information |
| * using HdrHistogram. |
| * |
| * This probe currently just reports a single summary of the histogram |
| * at the end of the test. HdrHistogram actually has a lot of nice support for |
| * recording histogram values at time intervals to a file and visualizing the results. |
| * See SingleWriterRecorder, HistogramLogWriter, and HisogramLogAnalyzer. |
| * |
| * TODO consider writing per interval histograms using HistogramLogWriter |
| */ |
| public class HdrHistogramProbe implements BenchmarkExecutionAwareProbe, BenchmarkTotalsOnlyProbe { |
| private static final Logger logger = LoggerFactory.getLogger(HdrHistogramProbe.class); |
| |
| private final int lower; |
| private long upper; |
| private final int numDigits; |
| private final Clock clock; |
| private final Consumer<Histogram> histogramConsumer; |
| private long[] startTimes; |
| private Histogram[] histograms; |
| |
| public HdrHistogramProbe(Consumer<Histogram> histogramConsumer) { |
| this(1, TimeUnit.HOURS.toNanos(5), 3, () -> System.nanoTime(), histogramConsumer); |
| } |
| |
| public HdrHistogramProbe(int lower, long upper, int numDigits, Clock clock, |
| Consumer<Histogram> histogramConsumer) { |
| this.lower = lower; |
| this.upper = upper; |
| this.numDigits = numDigits; |
| this.clock = clock; |
| this.histogramConsumer = histogramConsumer; |
| } |
| |
| @Override |
| public void beforeExecute(int threadIdx) { |
| startTimes[threadIdx] = clock.currentTimeNanos(); |
| } |
| |
| @Override |
| public void afterExecute(int threadIdx) { |
| histograms[threadIdx].recordValue(clock.currentTimeNanos() - startTimes[threadIdx]); |
| } |
| |
| @Override |
| public void start(BenchmarkDriver drv, BenchmarkConfiguration cfg) throws Exception { |
| final int threads = cfg.threads(); |
| upper = SECONDS.toNanos(cfg.duration()); |
| start(threads); |
| |
| } |
| |
| void start(int threads) { |
| startTimes = new long[threads]; |
| histograms = new Histogram[threads]; |
| |
| reset(); |
| } |
| |
| private void reset() { |
| final long timeStampMsec = System.currentTimeMillis(); |
| for (int i = 0; i < histograms.length; i++) { |
| histograms[i] = new Histogram(lower, upper, numDigits); |
| histograms[i].setStartTimeStamp(timeStampMsec); |
| } |
| } |
| |
| @Override |
| public void stop() { |
| logger.info("Stopped"); |
| } |
| |
| @Override |
| public Collection<String> metaInfo() { |
| return Arrays.asList("Timestamp", "Mean latency, nanos", "99th percentile latency, nanos"); |
| } |
| |
| @Override |
| public Collection<BenchmarkProbePoint> points() { |
| final Histogram aggregate = getHistogram(); |
| reset(); |
| |
| final double mean = aggregate.getMean(); |
| final long percentile99 = aggregate.getValueAtPercentile(99); |
| |
| final BenchmarkProbePoint point = |
| new BenchmarkProbePoint(aggregate.getEndTimeStamp(), new double[] {mean, percentile99}); |
| |
| for (int r = 0; r < 5; ++r) { |
| try { |
| logger.info("Saving histogram. r={}", r); |
| histogramConsumer.accept(aggregate); |
| } catch (Exception e) { |
| logger.error("Failed to save histogram. aggregate={}", aggregate.getTag(), e); |
| try { |
| Thread.sleep(SECONDS.toMillis(1)); |
| } catch (InterruptedException ignored) { |
| } |
| continue; |
| } |
| break; |
| } |
| return Collections.singleton(point); |
| } |
| |
| @Override |
| public void buildPoint(long time) { |
| |
| } |
| |
| Histogram getHistogram() { |
| final Histogram aggregate = new Histogram(lower, upper, numDigits); |
| for (final Histogram histogram : histograms) { |
| aggregate.add(histogram); |
| } |
| aggregate.setEndTimeStamp(System.currentTimeMillis()); |
| return aggregate; |
| } |
| } |