DummyParserBenchmark.java

package sample;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import org.openjdk.jmh.annotations.*;

import java.io.IOException;

public class DummyParserBenchmark {
    @GenerateMicroBenchmark
    public void measureSax_slow(Json json) throws IOException {
        json.parser.nextToken();
        JsonToken token;

        while ((token = json.parser.nextToken()) != null) {
            if (token != JsonToken.FIELD_NAME) {
                break;
            }
            json.parser.nextToken();
        }
    }

    @GenerateMicroBenchmark
    public void measureSax_fast(Json json) throws IOException {
        json.parser.nextToken();
        JsonToken token;

        while ((token = json.parser.nextToken()) != null) {
            json.parser.nextToken();
            if (token != JsonToken.FIELD_NAME) {
                break;
            }
        }
    }

    @GenerateMicroBenchmark
    public void measureSax_new_parser_slow() throws IOException {

        final JsonParser parser = new JsonFactory().createParser(Json.JSON);

        parser.nextToken();
        JsonToken token;

        while ((token = parser.nextToken()) != null) {
            if (token != JsonToken.FIELD_NAME) {
                break;
            }
            parser.nextToken();
        }
    }

    @GenerateMicroBenchmark
    public void measureSax_new_parser_fast() throws IOException {

        final JsonParser parser = new JsonFactory().createParser(Json.JSON);

        parser.nextToken();
        JsonToken token;

        while ((token = parser.nextToken()) != null) {
            parser.nextToken();
            if (token != JsonToken.FIELD_NAME) {
                break;
            }
        }
    }

    @State(Scope.Thread)
    public static class Json {
        private static final String JSON = "{\"key\":\"value\"}";

        private JsonParser parser;

        @Setup(Level.Iteration)
        public void init() throws IOException {
            parser = new JsonFactory().createParser(JSON);
        }
    }

}

results

$ java -jar build/distributions/jmh-gradle-sample-master-0.0.1-benchmarks.jar ".*Parser.*" -f 1 -wi 10 -i 10 -bm avgt -tu us

Benchmark                                             Mode   Samples         Mean   Mean error    Units
s.DummyParserBenchmark.measureSax_fast                avgt        10        0.029        0.001    us/op
s.DummyParserBenchmark.measureSax_new_parser_fast     avgt        10        0.813        0.034    us/op
s.DummyParserBenchmark.measureSax_new_parser_slow     avgt        10        1.733        0.056    us/op
s.DummyParserBenchmark.measureSax_slow                avgt        10        0.027        0.001    us/op