anuragdy commented on PR #666:
URL: https://github.com/apache/tomcat/pull/666#issuecomment-1715600463
Benchmarks with JMH
#### JDK11
```
Benchmark Mode Cnt Score Error Units
MyBenchmark.runNewTest thrpt 5 20981286.747 ± 52439.964 ops/s
MyBenchmark.runOldTest thrpt 5 9725982.396 ± 887782.808 ops/s
MyBenchmark.runSecondNewTest thrpt 5 45765078.184 ± 787752.738 ops/s
```
#### JDK8
```
Benchmark Mode Cnt Score Error Units
MyBenchmark.runNewTest thrpt 5 25402245.677 ± 2107638.349 ops/s
MyBenchmark.runOldTest thrpt 5 14939262.248 ± 632445.140 ops/s
MyBenchmark.runSecondNewTest thrpt 5 51103154.143 ± 1789043.949 ops/s
```
JMH Test Code -
```
package org.sample;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
import java.util.Arrays;
import java.util.HashMap;
import java.util.concurrent.TimeUnit;
public class MyBenchmark {
@State(org.openjdk.jmh.annotations.Scope.Benchmark)
public static class BenchmarkState {
private static final String[] SCOPE_NAMES =
new String[]{"applicationScope", "cookie", "header",
"headerValues", "initParam", "pageContext", "pageScope", "param",
"paramValues", "requestScope", "sessionScope"};
private static final String[] TEST_SCOPES =
{"requestScope", "pageScope", "sessionScope", "pageContext",
"header", "applicationScope", "cookie", "headerValues",
"initParam", "param", "paramValues"};
}
@Benchmark
@BenchmarkMode(Mode.Throughput)
@Fork(value = 1, warmups = 1)
public void runOldTest(BenchmarkState state) {
for (int i = 0; i < state.TEST_SCOPES.length; i++) {
Arrays.binarySearch(state.SCOPE_NAMES, state.TEST_SCOPES[i]);
}
}
@Benchmark
@BenchmarkMode(Mode.Throughput)
@Fork(value = 1, warmups = 1)
public void runNewTest(BenchmarkState state) {
int foundScope = -1;
for (int i = 0; i < state.TEST_SCOPES.length; i++) {
String scope = state.TEST_SCOPES[i];
switch (scope) {
case "requestScope":
foundScope = 1;
break;
case "pageScope":
foundScope = 2;
break;
case "sessionScope":
foundScope = 3;
break;
case "pageContext":
foundScope = 4;
break;
case "header":
foundScope = 5;
break;
case "applicationScope":
foundScope = 6;
break;
case "cookie":
foundScope = 7;
break;
case "headerValues":
foundScope = 8;
break;
case "initParam":
foundScope = 9;
break;
case "param":
foundScope = 10;
break;
case "paramValues":
foundScope = 11;
break;
default:
throw new RuntimeException("Did not find scope for value
" + scope);
}
if (foundScope < 0) {
throw new RuntimeException();
}
}
}
@Benchmark
@BenchmarkMode(Mode.Throughput)
@Fork(value = 1, warmups = 1)
public void runSecondNewTest(BenchmarkState state) {
for (int i = 0; i < state.TEST_SCOPES.length; i++) {
Scope.fromValue(state.TEST_SCOPES[i]);
}
}
public static void main(String[] args) throws Exception {
org.openjdk.jmh.Main.main(args);
}
private enum Scope {
applicationScope(0), cookie(1), header(2), headerValues(3),
initParam(4), pageContext(5), pageScope(6), param(7), paramValues(8),
requestScope(9), sessionScope(10);
final public int idx;
private static final HashMap<String, Scope> lookupMap = new
HashMap<>();
static {
for (Scope scope : Scope.values()) {
lookupMap.put(scope.name().toLowerCase(), scope);
}
}
Scope(int idx) {
this.idx = idx;
}
public static Scope fromValue(String value) {
return lookupMap.get(value);
}
}
}
```
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