franz1981

package redhat.app.services.benchmark;

import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.CompilerControl;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;

franz1981

import java.util.Objects;

/**
 * It's a growable ring buffer that allows to move tail/head sequences, clear, append, set/replace at specific positions.
 */
final class ArrayRingBuffer<T> {

    private static final Object[] EMPTY = new Object[0];
    // it points to the next slot after the last element
    private int tailSequence;

franz1981

Weird ASM produced around type guards

With

# VM version: JDK 17.0.7, Java HotSpot(TM) 64-Bit Server VM, 17.0.7+8-LTS-224

red.hat.puzzles.polymorphism.InstanceOfScalabilityBenchmark.encodeFullType -pencoderType=a -ppollutionCases=20000 -t 16 -f 4 -prof perfasm

where

franz1981

Benchmark                                                                       (same)  (size)  Mode  Cnt      Score   Error      Units
LowerCaseComparison.optimizedContentEqualsIgnoreCase                              true       8  avgt   10      6.896 ± 0.163      ns/op
LowerCaseComparison.optimizedContentEqualsIgnoreCase:CPI                          true       8  avgt           0.240          clks/insn
LowerCaseComparison.optimizedContentEqualsIgnoreCase:IPC                          true       8  avgt           4.161          insns/clk
LowerCaseComparison.optimizedContentEqualsIgnoreCase:L1-dcache-load-misses        true       8  avgt           0.007               #/op
LowerCaseComparison.optimizedContentEqualsIgnoreCase:L1-dcache-loads              true       8  avgt          36.741               #/op
LowerCaseComparison.optimizedContentEqualsIgnoreCase:L1-icache-load-misses        true       8  avgt          ≈ 10⁻³               #/op
LowerCaseComparison.optimizedContentEqualsIgnoreCase:L1-icache-loads    

franz1981

============================= C2-compiled nmethod ==============================
----------------------------------- Assembly -----------------------------------

Compiled method (c2)    1259  774       4       red.hat.puzzles.checks.LowerCaseComparison::optimizedContentEqualsIgnoreCase (12 bytes)
 total in heap  [0x00007f06e5229690,0x00007f06e522a3a0] = 3344
 relocation     [0x00007f06e52297f0,0x00007f06e5229818] = 40
 main code      [0x00007f06e5229820,0x00007f06e5229be0] = 960
 stub code      [0x00007f06e5229be0,0x00007f06e5229bf8] = 24
 oops           [0x00007f06e5229bf8,0x00007f06e5229c00] = 8
 metadata       [0x00007f06e5229c00,0x00007f06e5229c30] = 48

franz1981

============================= C2-compiled nmethod ==============================
----------------------------------- Assembly -----------------------------------

Compiled method (c2)     204  763       4       red.hat.puzzles.checks.LowerCaseComparison::unoptimizedContentEqualsIgnoreCase (12 bytes)
 total in heap  [0x00007f0279223e90,0x00007f0279224bd8] = 3400
 relocation     [0x00007f0279223ff0,0x00007f0279224018] = 40
 main code      [0x00007f0279224020,0x00007f0279224420] = 1024
 stub code      [0x00007f0279224420,0x00007f0279224438] = 24
 oops           [0x00007f0279224438,0x00007f0279224440] = 8
 metadata       [0x00007f0279224440,0x00007f0279224478] = 56

franz1981

package red.hat.puzzles.concurrent;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.CompilerControl;
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;

franz1981

package red.hat.puzzles.http;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.CompilerControl;
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;

franz1981

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Main {

    static {
    	System.out.println("here we go...");	
        try (ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor()) {
            executor.submit(() -> {}).get();
        } catch (Exception e) {

franz1981

package io.vertx.example.grpc.helloworld;

import com.google.protobuf.Message;
import com.google.protobuf.Struct;
import com.google.protobuf.util.JsonFormat;
import io.vertx.core.AbstractVerticle;
import io.vertx.core.Future;
import io.vertx.core.Launcher;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.net.SocketAddress;