Try to add back benchmarks

.gitmodules

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+[submodule "benchmark-bridge"]
+	path = benchmark-bridge
+	url = https://github.com/scalacenter/compiler-benchmark

benchmarks/src/main/java/pl/project13/scala/jmh/extras/profiler/ForkedAsyncProfiler.java

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+package pl.project13.scala.jmh.extras.profiler;
+
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.regex.Pattern;
+import java.util.stream.Stream;
+import joptsimple.OptionParser;
+import joptsimple.OptionSet;
+import joptsimple.OptionSpec;
+import org.openjdk.jmh.infra.BenchmarkParams;
+import org.openjdk.jmh.infra.IterationParams;
+import org.openjdk.jmh.profile.InternalProfiler;
+import org.openjdk.jmh.profile.ProfilerException;
+import org.openjdk.jmh.results.IterationResult;
+import org.openjdk.jmh.results.Result;
+import org.openjdk.jmh.runner.IterationType;
+
+public class ForkedAsyncProfiler implements InternalProfiler {
+  public static String HELLO = "";
+  private static final String ASYNC_PROFILER_DIR = "ASYNC_PROFILER_DIR";
+
+  private static final String DEFAULT_EVENT = "cpu";
+  private static final long DEFAULT_FRAMEBUF = 8 * 1024 * 1024;
+  private static final long DEFAULT_INTERVAL = 1000000;
+
+  private final String event;
+  private final Directions directions;
+  private final Path asyncProfilerDir;
+  private final boolean threads;
+  private final Boolean simpleName;
+  private Path outputDir;
+  private boolean started;
+  private final Path pidFile;
+  private final Boolean jfr;
+
+  private Path profiler;
+  private Path jattach;
+  private Long framebuf;
+  private Long interval;
+  private long pid = -1;
+  private int measurementIterationCount;
+  private Path flameGraphDir;
+  private Collection<? extends String> flameGraphOpts = Collections.emptyList();
+  private boolean verbose = false;
+  private List<Path> generated = new ArrayList<>();
+
+  public ForkedAsyncProfiler(String initLine) throws ProfilerException {
+    OptionParser parser = new OptionParser();
+    OptionSpec<String> outputDir = parser.accepts("dir", "Output directory").withRequiredArg().describedAs("directory").ofType(String.class);
+    OptionSpec<String> asyncProfilerDir = parser.accepts("asyncProfilerDir", "Location of clone of https://github.com/jvm-profiling-tools/async-profiler. Also can be provided as $" + ASYNC_PROFILER_DIR).withRequiredArg().ofType(String.class).describedAs("directory");
+    OptionSpec<String> pidFile = parser.accepts("pidFile", "File location where the PID of the process will be read from").withRequiredArg().ofType(String.class).describedAs("pidFile");
+    OptionSpec<String> event = parser.accepts("event", "Event to sample: cpu, alloc, lock, cache-misses etc.").withRequiredArg().ofType(String.class).defaultsTo("cpu");
+    OptionSpec<Long> framebuf = parser.accepts("framebuf", "Size of profiler framebuffer").withRequiredArg().ofType(Long.class).defaultsTo(DEFAULT_FRAMEBUF);
+    OptionSpec<Long> interval = parser.accepts("interval", "Profiling interval, in nanoseconds").withRequiredArg().ofType(Long.class).defaultsTo(DEFAULT_INTERVAL);
+    OptionSpec<Boolean> threads = parser.accepts("threads", "Profile threads separately").withRequiredArg().ofType(Boolean.class).defaultsTo(false,true);
+    OptionSpec<Boolean> verbose = parser.accepts("verbose", "Output the sequence of commands").withRequiredArg().ofType(Boolean.class).defaultsTo(false);
+    OptionSpec<String> flameGraphOpts = parser.accepts("flameGraphOpts", "Options passed to FlameGraph.pl").withRequiredArg().withValuesSeparatedBy(',').ofType(String.class);
+    OptionSpec<Directions> flameGraphDirection = parser.accepts("flameGraphDirection", "Directions to generate flamegraphs").withRequiredArg().ofType(Directions.class).defaultsTo(Directions.values());
+    OptionSpec<String> flameGraphDir = ProfilerUtils.addFlameGraphDirOption(parser);
+    OptionSpec<Boolean> simpleName = parser.accepts("simpleName", "Use simple names in flamegraphs").withRequiredArg().ofType(Boolean.class);
+    OptionSpec<Boolean> jfr = parser.accepts("jfr", "Also dump profiles from async-profiler in Java Flight Recorder format").withRequiredArg().ofType(Boolean.class);
+
+    OptionSet options = ProfilerUtils.parseInitLine(initLine, parser);
+    if (options.has(event)) {
+      this.event = options.valueOf(event);
+    } else {
+      this.event = DEFAULT_EVENT;
+    }
+    if (options.has(framebuf)) {
+      this.framebuf = options.valueOf(framebuf);
+    } else {
+      this.framebuf = DEFAULT_FRAMEBUF;
+    }
+    if (options.has(interval)) {
+      this.interval = options.valueOf(interval);
+    } else {
+      this.interval = DEFAULT_INTERVAL;
+    }
+    if (options.has(outputDir)) {
+      this.outputDir = Paths.get(options.valueOf(outputDir));
+      createOutputDirectories();
+    }
+
+    if (options.has(flameGraphOpts)) {
+      this.flameGraphOpts = options.valuesOf(flameGraphOpts);
+    }
+    if (options.has(flameGraphDirection)) {
+      this.directions = options.valueOf(flameGraphDirection);
+    } else {
+      this.directions = Directions.BOTH;
+    }
+    if (options.has(threads)) {
+      this.threads = options.valueOf(threads);
+    } else {
+      this.threads = false;
+    }
+    if (options.has(verbose)) {
+      this.verbose = options.valueOf(verbose);
+    }
+    if (options.has(simpleName)) {
+      this.simpleName = options.valueOf(simpleName);
+    } else {
+      this.simpleName = false;
+    }
+    if (options.has(jfr)) {
+      this.jfr = options.valueOf(jfr);
+    } else {
+      this.jfr = false;
+    }
+    this.flameGraphDir = ProfilerUtils.findFlamegraphDir(flameGraphDir, options);
+    this.asyncProfilerDir = lookupAsyncProfilerHome(asyncProfilerDir, options);
+    this.pidFile = lookupPidFile(pidFile, options);
+    Path build = this.asyncProfilerDir.resolve("build");
+    Path profiler1 = build.resolve("libasyncProfiler.so");
+    if (!Files.exists(profiler1)) {
+      throw new ProfilerException(profiler1 + " does not exist");
+    } else {
+      this.profiler = profiler1;
+      Path jattach1 = build.resolve("jattach");
+      if (!Files.exists(jattach1)) {
+        throw new ProfilerException(jattach1 + " does not exist");
+      } else {
+        this.jattach = jattach1;
+      }
+    }
+
+  }
+
+  private Path lookupPidFile(OptionSpec<String> pidFile, OptionSet options) throws ProfilerException {
+    if (options.has(pidFile)) {
+      return Paths.get(options.valueOf(pidFile));
+    } else {
+      throw new ProfilerException("Location of pid file must be provided to enable async profiler");
+    }
+  }
+
+  private Path lookupAsyncProfilerHome(OptionSpec<String> asyncProfilerDir, OptionSet options) throws ProfilerException {
+    if (options.has(asyncProfilerDir)) {
+      return Paths.get(options.valueOf(asyncProfilerDir));
+    } else {
+      String env = System.getenv(ASYNC_PROFILER_DIR);
+      if (env == null) {
+        throw new ProfilerException("Location of async-profiler-dir must be set with environment variable ASYNC_PROFILER_DIR or corresponding profiler option");
+      }
+      return Paths.get(env);
+    }
+  }
+
+  private void createOutputDirectories() {
+    try {
+      Files.createDirectories(this.outputDir);
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  @Override
+  public void beforeIteration(BenchmarkParams benchmarkParams, IterationParams iterationParams) {
+    if (!started && iterationParams.getType() == IterationType.MEASUREMENT) {
+      try {
+        if (this.pid == -1) {
+          this.pid = Long.parseLong(new String(Files.readAllBytes(this.pidFile)));
+        }
+        if (outputDir == null) {
+          outputDir = createTempDir(benchmarkParams.id().replaceAll("/", "-"));
+        }
+
+        String threadOpt = this.threads ? ",threads" : "";
+        String jfrOpt = this.jfr ? ",jfr,file=" + jfrFile().toAbsolutePath().toString() : "";
+        profilerCommand(String.format("start,event=%s%s%s,framebuf=%d,interval=%d", event, jfrOpt, threadOpt, framebuf, interval));
+        started = true;
+      } catch (IOException e) {
+        throw new RuntimeException("PID file " + this.pidFile.toAbsolutePath().toString() + " could not be read!");
+      }
+    }
+  }
+
+  @Override
+  public Collection<? extends Result> afterIteration(BenchmarkParams benchmarkParams, IterationParams iterationParams, IterationResult result) {
+    if (iterationParams.getType() == IterationType.MEASUREMENT) {
+      measurementIterationCount += 1;
+      if (measurementIterationCount == iterationParams.getCount()) {
+        if (jfr) {
+          Path jfrDump = jfrFile();
+          generated.add(jfrDump);
+          profilerCommand(String.format("stop,file=%s,jfr", jfrDump));
+        }
+        Path collapsedPath = outputDir.resolve("collapsed-" + event.toLowerCase() + ".txt");
+        profilerCommand(String.format("stop,file=%s,collapsed", collapsedPath));
+        generated.add(collapsedPath);
+        Path collapsedProcessedPath = collapsedPath;
+        if (simpleName) {
+          collapsedProcessedPath = outputDir.resolve("collapsed-simple-" + event.toLowerCase() + ".txt");
+          generated.add(collapsedProcessedPath);
+          replaceAllInFileLines(collapsedPath, collapsedProcessedPath, Pattern.compile("(^|;)[^;]*\\/"));
+        }
+
+        Path summaryPath = outputDir.resolve("summary.txt");
+        profilerCommand(String.format("stop,file=%s,summary", summaryPath));
+        generated.add(summaryPath);
+        if (flameGraphDir != null) {
+          if (EnumSet.of(Directions.FORWARD, Directions.BOTH).contains(directions)) {
+            flameGraph(collapsedProcessedPath, Collections.emptyList(), "");
+          }
+          if (EnumSet.of(Directions.REVERSE, Directions.BOTH).contains(directions)) {
+            flameGraph(collapsedProcessedPath, Arrays.asList("--reverse"), "-reverse");
+          }
+        }
+      }
+    }
+
+    return Collections.singletonList(result());
+  }
+
+  private Path jfrFile() {
+    return outputDir.resolve("profile-" + event.toLowerCase() + ".jfr");
+  }
+
+  private void replaceAllInFileLines(Path in, Path out, Pattern pattern) {
+    try (Stream<String> lines = Files.lines(in)){
+      Stream<CharSequence> mapped = lines.map(line -> pattern.matcher(line).replaceAll("$1"));
+      Files.write(out, mapped::iterator);
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  private void flameGraph(Path collapsedPath, List<String> extra, String suffix) {
+    generated.add(ProfilerUtils.flameGraph(collapsedPath, extra, suffix, flameGraphDir, flameGraphOpts, outputDir, event, verbose));
+  }
+
+  private NoResult result() {
+    StringBuilder result = new StringBuilder();
+    for (Path path : generated) {
+      result.append("\n").append(path.toAbsolutePath().toString());
+    }
+    return new NoResult("async-profiler", result.toString());
+  }
+
+  public static synchronized long getPidOfProcess(Process p) {
+    long pid = -1;
+
+    try {
+      if (p.getClass().getName().equals("java.lang.UNIXProcess")) {
+        Field f = p.getClass().getDeclaredField("pid");
+        f.setAccessible(true);
+        pid = f.getLong(p);
+        f.setAccessible(false);
+      }
+    } catch (Exception e) {
+      pid = -1;
+    }
+    return pid;
+  }
+
+  private void profilerCommand(String command) {
+    long pid = this.pid;
+
+    ProcessBuilder processBuilder = new ProcessBuilder(jattach.toAbsolutePath().toString(), String.valueOf(pid), "load", profiler.toAbsolutePath().toString(), "true", command);
+    if (verbose) {
+      processBuilder.redirectOutput(ProcessBuilder.Redirect.INHERIT);
+    }
+    ProfilerUtils.startAndWait(processBuilder, verbose);
+  }
+
+  private Path createTempDir(String prefix) {
+    try {
+      return Files.createTempDirectory(prefix);
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  @Override
+  public String getDescription() {
+    return "Profiling using async-profiler";
+  }
+}