/
BlockingBenchmark.java
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/
BlockingBenchmark.java
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/*
* BlockingBenchmark.java
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project 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 com.apple.foundationdb.test;
import java.util.ArrayList;
import java.util.concurrent.CompletableFuture;
import java.util.function.Function;
import com.apple.foundationdb.Database;
import com.apple.foundationdb.FDB;
import com.apple.foundationdb.Transaction;
public class BlockingBenchmark {
private static final int REPS = 100000;
private static final int PARALLEL = 100;
public static void main(String[] args) throws InterruptedException {
FDB fdb = FDB.selectAPIVersion(700);
// The cluster file DOES NOT need to be valid, although it must exist.
// This is because the database is never really contacted in this test.
try(Database database = fdb.open()) {
try(Transaction tr = database.createTransaction()) {
tr.setReadVersion(100000);
System.out.println("readVersion().join():");
runTests(tr, o -> {
try {
o.join();
}
catch(Exception e) {
// Ignore
}
return null;
});
System.out.println("readVersion().get():");
runTests(tr, o -> {
try {
o.get();
}
catch(Exception e) {
// Ignore
}
return null;
});
System.out.println("readVersion().thenApplyAsync(identity).get():");
runTests(tr, o -> {
try {
o.thenApplyAsync(Function.identity(), FDB.DEFAULT_EXECUTOR).get();
}
catch(Exception e) {
// Ignore
}
return null;
});
System.out.println("readVersion().thenApplyAsync^10(identity).get():");
runTests(tr, o -> {
for(int i = 0; i < 10; i++)
o = o.thenApplyAsync(Function.identity(), FDB.DEFAULT_EXECUTOR);
try {
o.get();
}
catch(Exception e) {
// Ignore
}
return null;
});
System.out.println("readVersion().get^100():");
runTests(tr, o -> {
for(int i = 0; i < 100; i++) {
try {
o.get();
}
catch(Exception e) {
// Ignore
}
}
return null;
});
}
}
}
private static void runTests(Transaction tr, Function<CompletableFuture<Long>, Void> blockMethod) {
for(int r=0; r<4; r++) {
long start = System.currentTimeMillis();
for(int i = 0; i < REPS; i++) {
blockMethod.apply(tr.getReadVersion());
}
long taken = System.currentTimeMillis() - start;
System.out.println(" " + REPS + " done in " + taken + "ms -> " + ((taken * 1000.0) / REPS) + " us latency");
ArrayList<CompletableFuture<Long>> futures = new ArrayList<CompletableFuture<Long>>(PARALLEL);
for(int j=0; j<PARALLEL; j++)
futures.add(null);
start = System.currentTimeMillis();
for(int i = 0; i < REPS; i += PARALLEL) {
for(int j=0; j<PARALLEL; j++)
futures.set(j, tr.getReadVersion());
for(int j=0; j<PARALLEL; j++)
blockMethod.apply(futures.get(j));
}
taken = System.currentTimeMillis() - start;
System.out.println(" " + REPS + " done in " + taken + "ms -> " + (REPS / (taken)) + " KHz");
}
}
private BlockingBenchmark() {}
}