1.准备工作
本地需要安装Redis,使用JMH做基准测试的框架:
<dependency> <groupId>org.openjdk.jmh</groupId> <artifactId>jmh-core</artifactId> <version>1.21</version></dependency><dependency> <groupId>org.openjdk.jmh</groupId> <artifactId>jmh-generator-annprocess</artifactId> <version>1.21</version> <scope>provided</scope></dependency>
项目添加Jedis和Lettuce的依赖:
<dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version></dependency><dependency> <groupId>io.lettuce</groupId> <artifactId>lettuce-core</artifactId> <version>5.0.3.RELEASE</version></dependency>
如果你对JMH不是很熟悉,建议你去看看Code Tools: jmh,和samples 。
2.编写测试代码
2.1 Jedis
@BenchmarkMode(Mode.Throughput)@Warmup(iterations = 1)@Threads(100)@State(Scope.Thread)@Measurement(iterations = 2, time = 600, timeUnit = TimeUnit.MILLISECONDS)@OutputTimeUnit(TimeUnit.MILLISECONDS)public class JedisStudy { private static final int LOOP = 1; private Jedis jedis; @Setup public void setup() { jedis = new Jedis("127.0.0.1", 6379); } @Benchmark public void get() { for (int i = 0; i < LOOP; ++i) { jedis.get("a"); } } }
public static void main(String[] args) throws RunnerException { Options options = new OptionsBuilder().include(JedisStudy.class.getSimpleName()) .output("benchmark/jedis-Throughput.log").forks(1).build(); new Runner(options).run(); }
这里用到的注解,其中@OutputTimeUnit(TimeUnit.MILLISECONDS)
很容易理解,就是测试结果的单位,@Threads(100)
是开启多少个线程测试;@Warmup(iterations = 1)
是预热的循环次数;@BenchmarkMode(Mode.Throughput)
是测试的模式,可以测试吞吐,延时等;@Measurement(iterations = 2, time = 600, timeUnit = TimeUnit.MILLISECONDS)
是测试的循环次数,以及时长;其中比较难以理解的就是@State(Scope.Thread)
,这里我简单描述下吧,@State(Scope.Thread)
和下面的@Setup
配合使用,意思是每个测试线程,都会使用独立的一个变量,这个变量就是Jedis jedis
,使用@Setup
所修饰的方法来做初始化。
参考JMHSample_03_States 和JMHSample_04_DefaultState 。
其中因为Jedis是线程不安全的,所以每个线程使用的都是一个单独的Jedis对象,这里可以使用Pool来优化,读者如果感兴趣,可以尝试。
2.2 Lettuce
@BenchmarkMode(Mode.Throughput)@Warmup(iterations = 1)@Threads(100)@State(Scope.Benchmark)@Measurement(iterations = 2, time = 600, timeUnit = TimeUnit.MILLISECONDS)@OutputTimeUnit(TimeUnit.MILLISECONDS)public class LettuceAsyncStudy { private static final int LOOP = 1; private StatefulRedisConnection<String, String> connection; @Setup public void setup() { RedisClient client = RedisClient.create("redis://localhost"); connection = client.connect(); } @Benchmark public void get() throws ExecutionException, InterruptedException { RedisAsyncCommands<String, String> commands = connection.async(); List<RedisFuture<String>> redisFutureList = new ArrayList<>(); for (int i = 0; i < LOOP; ++i) { RedisFuture<String> future = commands.get("a"); redisFutureList.add(future); future.get(); } redisFutureList.forEach(f -> { try { f.get(); } catch (Exception e) { e.printStackTrace(); } }); } }
public static void main(String[] args) throws RunnerException { Options options = new OptionsBuilder().include(LettuceAsyncStudy.class.getSimpleName()) .output("benchmark/lettuceAsync-Throughput.log").forks(1).build(); new Runner(options).run(); }
这里和上面Jedis的区别就是@State(Scope.Benchmark)
,其实就是StatefulRedisConnection<String, String> connection
这个对象是所有测试线程共享的,因为Lettuce的StatefulRedisConnection是线程的安全的,所以可以这么用。
3.测试结果
Client | 线程数(并发数) | 每次测试方法里循环执行get的次数 | Throughput(ops/ms) |
---|---|---|---|
Jedis | 100 | 1 | 46.628 |
Lettuce | 100 | 1 | 106.589 |
-- | -- | -- | -- |
Jedis | 100 | 10 | 5.307 |
Lettuce | 100 | 10 | 14.802 |
-- | -- | -- | -- |
Jedis | 100 | 100 | 0.483 |
Lettuce | 100 | 100 | 1.599 |
作者:我是杨正
链接:https://www.jianshu.com/p/7a1f8c69a8cb
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