指令测试

SQLBenchmark.java

package io.mycat;


import example.SQLFast;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;

import java.nio.charset.StandardCharsets;
import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.Throughput)//基准测试类型
@OutputTimeUnit(TimeUnit.SECONDS)//基准测试结果的时间类型
@Warmup(iterations = 6)//预热的迭代次数
@Threads(1)//测试线程数量
@State(Scope.Thread)//该状态为每个线程独享
//度量:iterations进行测试的轮次，time每轮进行的时长，timeUnit时长单位,batchSize批次数量
@Measurement(iterations = 5, time = -1, timeUnit = TimeUnit.SECONDS, batchSize = -1)
public class SQLBenchmark {
    io.mycat.SQLParser parser;
    io.mycat.SQLContext context;
    byte[] srcBytes;
    String src;
    SQLFast.collector c;

    //run
    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                .include(SQLBenchmark.class.getSimpleName())
                .forks(1)
                //.output("SQLBenchmark.log")//输出信息到文件
                .build();
        new Runner(opt).run();
    }

    @Setup
    public void init() {
        src = "SELECT a FROM ab             , ee.ff AS f,(SELECT a FROM `schema_bb`.`tbl_bb`,(SELECT a FROM ccc AS c, `dddd`));";
        srcBytes = src.getBytes(StandardCharsets.UTF_8);//20794
        parser = new io.mycat.SQLParser();
        context = new io.mycat.SQLContext();
        c = new SQLFast.collector();
        System.out.println("=> init");
    }

    @Benchmark
    public int test1() {
        int pos = 0;
        int result = 0;
        int len = srcBytes.length;
        while (pos < len) {
            result = srcBytes[pos] + result; // TODO: this line
            pos++;
        }
        return result;
    }
    @Benchmark
    public int test2() {
        int pos = 0;
        int result = 0;
        int len = srcBytes.length;
        while (pos < len) {
           result = result<<8 | srcBytes[pos]; // TODO: this line
            pos++;
        }
        return result;
    }
    @Benchmark
    public int test3() {
        int pos = 0;
        int result = 0;
        int len = srcBytes.length;
        while (pos < len) {
            result = srcBytes[pos]+1000000; // TODO: this line
            pos++;
        }
        return result;
    }
}