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@ecki ecki/ToString.java
Last active Jul 20, 2017

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JMH int to String Benchmark
> mvn clean package
> java -jar target/benchmark.jarar -r 10 -f 3
...
# Run complete. Total time: 00:51:31
Benchmark (n) Mode Cnt Score Error Units
ToString.IntPlusString 0 thrpt 9 25,904 ± 1,751 ops/us
ToString.IntPlusString 1 thrpt 9 28,621 ± 1,873 ops/us
ToString.IntPlusString -1000 thrpt 9 15,134 ± 3,197 ops/us
ToString.IntPlusString 200000 thrpt 9 12,207 ± 3,494 ops/us
ToString.IntPlusString 2147483647 thrpt 9 9,118 ± 1,187 ops/us
ToString.IntPlusString -2147483648 thrpt 9 23,403 ± 4,224 ops/us
ToString.IntegerToString 0 thrpt 9 20,160 ± 3,844 ops/us
ToString.IntegerToString 1 thrpt 9 18,452 ± 2,015 ops/us
ToString.IntegerToString -1000 thrpt 9 11,405 ± 0,831 ops/us
ToString.IntegerToString 200000 thrpt 9 8,810 ± 0,316 ops/us
ToString.IntegerToString 2147483647 thrpt 9 7,542 ± 0,624 ops/us
ToString.IntegerToString -2147483648 thrpt 9 75,560 ± 2,767 ops/us
ToString.StringBuilderAppend 0 thrpt 9 26,582 ± 3,667 ops/us
ToString.StringBuilderAppend 1 thrpt 9 27,113 ± 3,415 ops/us
ToString.StringBuilderAppend -1000 thrpt 9 14,386 ± 0,775 ops/us
ToString.StringBuilderAppend 200000 thrpt 9 11,085 ± 1,335 ops/us
ToString.StringBuilderAppend 2147483647 thrpt 9 7,125 ± 1,288 ops/us
ToString.StringBuilderAppend -2147483648 thrpt 9 22,065 ± 2,776 ops/us
ToString.StringPlusInt 0 thrpt 9 27,759 ± 2,075 ops/us
ToString.StringPlusInt 1 thrpt 9 25,794 ± 2,020 ops/us
ToString.StringPlusInt -1000 thrpt 9 15,098 ± 2,029 ops/us
ToString.StringPlusInt 200000 thrpt 9 11,955 ± 1,834 ops/us
ToString.StringPlusInt 2147483647 thrpt 9 6,938 ± 0,693 ops/us
ToString.StringPlusInt -2147483648 thrpt 9 21,517 ± 1,594 ops/us
ToString.StringValueOf 0 thrpt 9 16,575 ± 1,510 ops/us
ToString.StringValueOf 1 thrpt 9 17,559 ± 2,895 ops/us
ToString.StringValueOf -1000 thrpt 9 10,581 ± 0,856 ops/us
ToString.StringValueOf 200000 thrpt 9 9,488 ± 1,845 ops/us
ToString.StringValueOf 2147483647 thrpt 9 6,804 ± 0,256 ops/us
ToString.StringValueOf -2147483648 thrpt 9 74,555 ± 4,836 ops/us
// class name and method names are not Java convention but readable
package net.eckenfels.jmhtest;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Threads;
import org.openjdk.jmh.annotations.Warmup;
// default benchmark settings (can be overwritten on command line)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@Warmup(iterations = 2, time = 2, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 3, time = 10, timeUnit = TimeUnit.SECONDS)
@Threads(value=1)
@Fork(value=3)
@State(Scope.Thread)
public class ToString
{
// repeat all tests with the following integers
@Param(value = {"0", "1", "-1000", "200000", ""+Integer.MAX_VALUE, ""+Integer.MIN_VALUE})
int n;
// JMH alloes you to return anything, this avoids optimizations
@Benchmark
public String StringValueOf()
{
return String.valueOf(n);
}
@Benchmark
public String IntegerToString()
{
return Integer.toString(n);
}
@Benchmark
public String StringBuilderAppend()
{
return new StringBuilder().append(n).toString();
}
@Benchmark
public String StringPlusInt()
{
return "" + n;
}
@Benchmark
public String IntPlusString()
{
return n + "";
}
}
@ecki

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ecki commented May 1, 2015

This is german locale, so , is the decimal seperator. Results are in operations per micro second.

@qizy09

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qizy09 commented Jul 20, 2017

Would you also test String.format()? Just curious :)

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