YourKit probe class that allows one to capture memory snapshots after certain phases has run in the Scala compiler.

MemoryProbe.java

import com.yourkit.probes.*;
import com.yourkit.api.*;

@MethodPattern("scala.tools.nsc.Global$Run:advancePhase()")
public class MemoryProbe {

  public static void onEnter(@This scala.tools.nsc.Global.Run run) {
		scala.reflect.internal.Phase patmatPhase = run.phaseNamed("patmat");
		scala.reflect.internal.Phase postErasurePhase = run.phaseNamed("posterasure");
		scala.reflect.internal.Phase icodePhase = run.phaseNamed("icode");
		if (run.runIsAt(patmatPhase)) {
			handlePhase(patmatPhase);
		} else if (run.runIsAt(postErasurePhase)) {
			handlePhase(postErasurePhase);
		} else if (run.runIsAt(icodePhase)) {
			handlePhase(icodePhase);
		}
	}

	private static void handlePhase(scala.reflect.internal.Phase phase) {
		try {
			String name = phase.name();
			System.out.println("After phase " + name);
			Controller controller = new Controller();
			controller.advanceGeneration(name);
			System.gc();
			System.gc();
			controller.captureMemorySnapshot();
		} catch (Exception e) {
			System.out.println("Exception during taking memory dump " + e);
		}
	}

}