test/setup_aot/JavacBenchApp.java

@@ -1,7 +1,7 @@
  /*
-  * Copyright (c) 2023, 2024, Oracle and/or its affiliates. All rights reserved.
+  * Copyright (c) 2023, 2025, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.

@@ -21,10 +21,12 @@
   * questions.
   *
   */
  
  import java.lang.invoke.MethodHandles;
+ import java.lang.management.ManagementFactory;
+ import java.lang.management.RuntimeMXBean;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.net.URI;
  import java.util.ArrayList;
  import java.util.Collection;

@@ -204,10 +206,39 @@
              throw new RuntimeException("Expected \"this is a test\", but got \"" + s + "\"");
          }
      }
  
      public static void main(String args[]) throws Throwable {
+         if (System.getProperty("JavacBenchApp.leyden.bench") == null) {
+             run(args);
+         } else {
+             leydenDriver(args);
+         }
+     }
+ 
+     // Write the same output as other leyden benchmarks for easy benchmarking.
+     // See https://github.com/openjdk/leyden/blob/premain/test/hotspot/jtreg/premain/lib/Bench.gmk
+     static void leydenDriver(String args[]) throws Throwable {
+         long mainStart = System.currentTimeMillis();
+         RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
+         // This includes all the time spent inside the JVM before main() is reached
+         // (since os::Posix::init is called and initial_time_count is initialized).
+         long vmStart = runtimeMXBean.getStartTime();
+         long maxBeanOverHead = System.currentTimeMillis() - mainStart;
+ 
+         run(args);
+ 
+         long end = System.currentTimeMillis();
+         System.out.println("#### Booted and returned in " + (end - vmStart - maxBeanOverHead) + "ms");
+         System.out.println("#### (debug) mainStart = " + mainStart);
+         System.out.println("#### (debug) vmStart = " + vmStart);
+         System.out.println("#### (debug) before main (mainStart - vmStart) = " + (mainStart - vmStart));
+         System.out.println("#### (debug) maxBeanOverHead = " + maxBeanOverHead);
+         System.out.println("#### (debug) end = " + end);
+     }
+ 
+     static void run(String args[]) throws Throwable {
          long started = System.currentTimeMillis();
          JavacBenchApp bench = new JavacBenchApp();
  
          int count = 0;
          if (args.length > 0) {