Lettuce和Jedis的基準測試

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原文連結:https://www.dubby.cn/detail.html?id=9108

1.準備工作

本地需要安裝Redis,使用JMH做基準測試的框架:

<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>
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專案新增Jedis和Lettuce的依賴:

<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>
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如果你對JMH不是很熟悉,建議你去看看Code Tools: jmh,和samples

2.編寫測試程式碼

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");
        }
    }
}
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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();
}
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這裡用到的註解,其中@OutputTimeUnit(TimeUnit.MILLISECONDS)很容易理解,就是測試結果的單位,@Threads(100)是開啟多少個執行緒測試;@Warmup(iterations = 1)是預熱的迴圈次數;@BenchmarkMode(Mode.Throughput)是測試的模式,可以測試吞吐,延時等;@Measurement(iterations = 2, time = 600, timeUnit = TimeUnit.MILLISECONDS)是測試的迴圈次數,以及時長;其中比較難以理解的就是@State(Scope.Thread),這裡我簡單描述下吧,@State(Scope.Thread)和下面的@Setup配合使用,意思是每個測試執行緒,都會使用獨立的一個變數,這個變數就是Jedis jedis,使用@Setup所修飾的方法來做初始化。

參考JMHSample_03_States JMHSample_04_DefaultState

其中因為Jedis是執行緒不安全的,所以每個執行緒使用的都是一個單獨的Jedis物件,這裡可以使用Pool來優化,讀者如果感興趣,可以嘗試。

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();
            }
        });
    }
}
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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();
}
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這裡和上面Jedis的區別就是@State(Scope.Benchmark),其實就是StatefulRedisConnection<String, String> connection這個物件是所有測試執行緒共享的,因為Lettuce的StatefulRedisConnection是執行緒的安全的,所以可以這麼用。

3.測試結果

Client 執行緒數(併發數) 每次測試方法裡迴圈執行get的次數 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

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