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v2 blackholes, java8

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This commit is contained in:
Shautvast 2023-08-28 23:01:46 +02:00
parent 720f0f07a8
commit 17fb67b7ad
4 changed files with 88 additions and 36 deletions
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10
pom.xml
View file

@ -9,8 +9,8 @@
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>20</maven.compiler.source>
<maven.compiler.target>20</maven.compiler.target>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
@ -41,9 +41,9 @@
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<compilerVersion>9</compilerVersion>
<source>9</source>
<target>9</target>
<compilerVersion>8</compilerVersion>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
<plugin>

45
report.md Normal file
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@ -0,0 +1,45 @@
**cStyle**
```
23,57% 0x0000000112765de8: ;*aaload {reexecute=0 rethrow=0 return_oop=0}
; - java.util.ArrayList::elementData@5 (line 411)
; - java.util.ArrayList::get@11 (line 428)
; - com.github.shautvast.benchmarks.loops.LoopBenchmark::cStyle@20 (line 35)
; - com.github.shautvast.benchmarks.loops.jmh_generated.LoopBenchmark_cStyle_jmhTest::cStyle_avgt_jmhStub@19 (line 193)
30,39% 0x0000000112765e00: ;*getfield coder {reexecute=0 rethrow=0 return_oop=0}
; - java.lang.String::coder@7 (line 4556)
; - java.lang.String::length@6 (line 1499)
; - com.github.shautvast.benchmarks.loops.LoopBenchmark::cStyle@28 (line 35)
; - com.github.shautvast.benchmarks.loops.jmh_generated.LoopBenchmark_cStyle_jmhTest::cStyle_avgt_jmhStub@19 (line 193)
27,83% 0x0000000112765e28: ;*getfield coder {reexecute=0 rethrow=0 return_oop=0}
; - java.lang.String::coder@7 (line 4556)
; - java.lang.String::length@6 (line 1499)
; - com.github.shautvast.benchmarks.loops.LoopBenchmark::cStyle@28 (line 35)
; - com.github.shautvast.benchmarks.loops.jmh_generated.LoopBenchmark_cStyle_jmhTest::cStyle_avgt_jmhStub@19 (line 193)
5,18% 0x0000000112765e3c: ;*if_icmpge {reexecute=0 rethrow=0 return_oop=0}
; - com.github.shautvast.benchmarks.loops.LoopBenchmark::cStyle@10 (line 34)
; - com.github.shautvast.benchmarks.loops.jmh_generated.LoopBenchmark_cStyle_jmhTest::cStyle_avgt_jmhStub@19 (line 193)
```
**enhancedForLoop**
```
29,09% 0x0000000113e5a748: ;*aaload {reexecute=0 rethrow=0 return_oop=0}
; - java.util.ArrayList$Itr::next@64 (line 975)
; - com.github.shautvast.benchmarks.loops.LoopBenchmark::enhancedForLoop@25 (line 52)
; - com.github.shautvast.benchmarks.loops.jmh_generated.LoopBenchmark_enhancedForLoop_jmhTest::enhancedForLoop_avgt_jmhStub@19 (line 193)
23,18% 0x0000000113e5a760: ;*getfield coder {reexecute=0 rethrow=0 return_oop=0}
; - java.lang.String::coder@7 (line 4556)
; - java.lang.String::length@6 (line 1499)
; - com.github.shautvast.benchmarks.loops.LoopBenchmark::enhancedForLoop@38 (line 53)
; - com.github.shautvast.benchmarks.loops.jmh_generated.LoopBenchmark_enhancedForLoop_jmhTest::enhancedForLoop_avgt_jmhStub@19 (line 193)
17,19% 0x0000000113e5a788: ;*getfield coder {reexecute=0 rethrow=0 return_oop=0}
; - java.lang.String::coder@7 (line 4556)
; - java.lang.String::length@6 (line 1499)
; - com.github.shautvast.benchmarks.loops.LoopBenchmark::enhancedForLoop@38 (line 53)
; - com.github.shautvast.benchmarks.loops.jmh_generated.LoopBenchmark_enhancedForLoop_jmhTest::enhancedForLoop_avgt_jmhStub@19 (line 193)
```

45
src/main/java/com/github/shautvast/benchmarks/loops/LoopBenchmark.java
View file

@ -1,6 +1,7 @@
package com.github.shautvast.benchmarks.loops;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;
import org.openjdk.jmh.profile.*;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
@ -13,10 +14,9 @@ import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Fork(value = 1)
@State(Scope.Thread)
public class LoopBenchmark {
@org.openjdk.jmh.annotations.State(Scope.Thread)
public static class State {
final static int LIST_SIZE = 1000;
List<String> list = new ArrayList<>(LIST_SIZE);
@ -26,38 +26,45 @@ public class LoopBenchmark {
list.add(UUID.randomUUID().toString());
}
}
@Benchmark
public void forLoop(Blackhole bh) {
for (int i = 0; i < LIST_SIZE; i++) {
bh.consume(list.get(i));
}
}
@Benchmark
public long cStyle(LoopBenchmark.State state) {
long totalLength = 0;
for (int i = 0; i < State.LIST_SIZE; i++) {
totalLength += state.list.get(i).length();
public void whileLoop(Blackhole bh) {
int i = 0;
while (i < LIST_SIZE) {
bh.consume(list.get(i));
i++;
}
return totalLength;
}
@Benchmark
public long iterator(LoopBenchmark.State state) {
long totalLength = 0;
for (Iterator<String> iterator = state.list.iterator(); iterator.hasNext(); ) {
totalLength += iterator.next().length();
public void iterator(Blackhole bh) {
for (Iterator<String> iterator = list.iterator(); iterator.hasNext(); ) {
bh.consume(iterator.next());
}
return totalLength;
}
@Benchmark
public long enhancedForLoop(LoopBenchmark.State state) {
long totalLength = 0;
for (String element : state.list) {
totalLength += element.length();
public void enhancedForLoop(Blackhole bh) {
for (String element : list) {
bh.consume(element.length());
}
return totalLength;
}
@Benchmark
public long stream(LoopBenchmark.State state) {
return state.list.stream().mapToLong(String::length).sum();
public void stream(Blackhole bh) {
list.stream().forEach(bh::consume);
}
@Benchmark
public void forEach(Blackhole bh) {
list.forEach(bh::consume);
}
public static void main(String[] args) throws RunnerException {