io.nats.examples.autobench.LatencyBenchmark Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jnats Show documentation
Show all versions of jnats Show documentation
Client library for working with the NATS messaging system.
// Copyright 2015-2018 The NATS Authors
// 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 io.nats.examples.autobench;
import io.nats.client.*;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.text.NumberFormat;
import java.time.Duration;
import java.util.ArrayList;
import java.util.List;
import java.util.LongSummaryStatistics;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
public class LatencyBenchmark extends AutoBenchmark {
static FileOutputStream lcsvOut;
static List allPayloadSizes;
static List> allMeasurements;
// We only touch this in subThread, until test is done so no locking
final ArrayList measurements = new ArrayList<>((int)this.getMessageCount());
final String lcsv;
public LatencyBenchmark(String name, long messageCount, long messageSize, String lcsv) {
super(name, messageCount, messageSize);
this.lcsv = lcsv;
}
public void execute(Options connectOptions) throws InterruptedException {
byte[] payload = createPayload();
String subject = getSubject();
final CompletableFuture go = new CompletableFuture<>();
final CompletableFuture subReady = new CompletableFuture<>();
final CompletableFuture pubReady = new CompletableFuture<>();
final CompletableFuture subDone = new CompletableFuture<>();
final CompletableFuture pubDone = new CompletableFuture<>();
final CyclicBarrier lockStep = new CyclicBarrier(2);
final AtomicLong start = new AtomicLong();
Thread subThread = new Thread(() -> {
try {
Connection subConnect = Nats.connect(connectOptions);
if (subConnect.getStatus() != Connection.Status.CONNECTED) {
throw new Exception("Unable to connect");
}
try {
Subscription sub = subConnect.subscribe(subject);
subConnect.flush(Duration.ofSeconds(5));
subReady.complete(null);
go.get();
int count = 0;
while(count < this.getMessageCount()) {
Message msg = sub.nextMessage(Duration.ofSeconds(5));
if (msg != null){
measurements.add(System.nanoTime() - start.get());
count++;
lockStep.await(5000, TimeUnit.MILLISECONDS);
}
}
subDone.complete(null);
} catch (Exception exp) {
this.setException(exp);
} finally {
subConnect.close();
}
} catch (Exception ex) {
subReady.cancel(true);
this.setException(ex);
} finally {
subDone.complete(null);
}
}, "Latency Test - Subscriber");
subThread.start();
Thread pubThread = new Thread(() -> {
try {
Connection pubConnect = Nats.connect(connectOptions);
if (pubConnect.getStatus() != Connection.Status.CONNECTED) {
throw new Exception("Unable to connect");
}
try {
pubReady.complete(null);
go.get();
for(int i = 0; i < this.getMessageCount(); i++) {
lockStep.reset();
start.set(System.nanoTime());
pubConnect.publish(subject, payload);
try {pubConnect.flush(Duration.ofMillis(5000));}catch(Exception e){}
lockStep.await();
}
pubDone.complete(null);
} finally {
pubConnect.close();
}
} catch (Exception ex) {
pubReady.cancel(true);
this.setException(ex);
} finally {
pubDone.complete(null);
}
}, "Latency Test - Publisher");
pubThread.start();
getFutureSafely(subReady);
getFutureSafely(pubReady);
if (this.getException() != null) {
go.complete(null); // just in case the other thread is waiting
return;
}
go.complete(null);
getFutureSafely(pubDone);
getFutureSafely(subDone);
}
@Override
public void beforePrintFirstOfKind() {
System.out.println("Latency | nanos | |");
System.out.println("| payload | count | min | median | max | std dev ms |");
System.out.println("| ----------- | ------- | ------ | -------- | -------- | ---------- |");
if (lcsv != null) {
try {
lcsvOut = new FileOutputStream(lcsv);
allPayloadSizes = new ArrayList<>();
allMeasurements = new ArrayList<>();
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
}
}
}
@Override
public void printResult() {
if (this.getException() != null) {
String message = this.getException().getMessage();
if (message == null) {
message = this.getException().getClass().getCanonicalName();
}
System.out.printf("%-18s Exception: %12s\n", getName(), message);
return;
}
if (allMeasurements != null) {
allPayloadSizes.add(getMessageSize());
allMeasurements.add(measurements);
}
LongSummaryStatistics stats = measurements.stream().
mapToLong(Long::longValue).
collect(LongSummaryStatistics::new,
LongSummaryStatistics::accept,
LongSummaryStatistics::combine);
// Convert to micro-seconds
long min = stats.getMin() / 1_000;
long max = stats.getMax() / 1_000;
long count = stats.getCount();
double average = stats.getAverage() / 1e3;
double median = calcMedian() / 1e3;
double stdDev = Math.sqrt(measurements.stream().
mapToDouble(Long::doubleValue).
map(d -> ((d-average) * (d-average))).
sum()) / (1e3 * (count-1));
System.out.printf("| %-11s | %7s | %6s | %8.2f | %8s | +/- %6.2f |\n",
getName().replaceAll("Latency ", "") + " bytes",
NumberFormat.getIntegerInstance().format(count),
NumberFormat.getIntegerInstance().format(min),
median,
NumberFormat.getIntegerInstance().format(max),
stdDev);
}
@Override
public void afterPrintLastOfKind() {
if (allMeasurements != null) {
try {
int cols = allPayloadSizes.size();
int rows = allMeasurements.get(0).size();
StringBuilder sb = new StringBuilder();
for (int c = 0; c < cols; c++) {
if (c > 0) {
sb.append(",");
}
sb.append(allPayloadSizes.get(c)).append(" bytes");
}
sb.append("\r\n");
lcsvOut.write(sb.toString().getBytes(StandardCharsets.US_ASCII));
for (int r = 0; r < rows; r++) {
sb.setLength(0);
for (int c = 0; c < cols; c++) {
if (c > 0) {
sb.append(",");
}
sb.append(allMeasurements.get(c).get(r));
}
sb.append("\r\n");
lcsvOut.write(sb.toString().getBytes(StandardCharsets.US_ASCII));
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
public double calcMedian() {
int size = measurements.size();
int middle = measurements.size() / 2;
measurements.sort(Long::compareTo);
if (size % 2 == 1) {
return measurements.get(middle).longValue();
} else {
double low = measurements.get(middle-1).doubleValue() / 2.0;
double high = measurements.get(middle).doubleValue() / 2.0;
return high + low; // already divided by 2
}
}
} © 2015 - 2025 Weber Informatics LLC | Privacy Policy