imported brians code

[nestedvm.git] / src / tests / SpeedTest.java

diff --git a/src/tests/SpeedTest.java b/src/tests/SpeedTest.java
new file mode 100644 (file)
index 0000000..5362961
--- /dev/null
+++ b/src/tests/SpeedTest.java
@@ -0,0 +1,66 @@
+package tests;
+
+import org.xwt.mips.Runtime;
+import org.xwt.mips.Interpreter;
+
+class SpeedTest {
+    private static long start,end;
+    private static long now() { return System.currentTimeMillis(); }
+    private static void start()  { start = now(); }
+    private static void end() { end = now(); }
+    private static float diff() { return ((float)(end-start))/1000; }
+    
+    public static void main(String[] args) throws Exception {
+        float d;
+        
+        if(args.length < 2) { System.err.println("Usage: SpeedTest {classname|mips binary} number_of_runs args"); System.exit(1); }
+        String className = args[0];
+        int runs = Integer.parseInt(args[1]);
+        if(runs < 5) throw new Error("Runs must be >= 5");
+        String[] appArgs = new String[args.length-1];
+        appArgs[0] = className;
+        for(int i=2;i<args.length;i++) appArgs[i-1] = args[i];
+        
+        Class c = null;
+        boolean binary = className.endsWith(".mips");
+        if(!binary) {
+            start();
+            c = Class.forName(className);
+            end();
+            d = diff();
+            System.out.println("Class.forName() took " + d + "sec");
+            
+            start();
+            c.newInstance();
+            end();
+            d = diff();
+            System.out.println("c.newInstance() took " + d + "sec");
+            
+            if(!Runtime.class.isAssignableFrom(c)) { System.err.println(className + " isn't a MIPS compiled class"); System.exit(1); }
+        }
+            
+        float times[] = new float[runs];
+        
+        for(int i=0;i<runs;i++) {
+            Runtime runtime = binary ? new Interpreter(className) : (Runtime) c.newInstance();
+            System.gc();
+            start();
+            int status = runtime.run(appArgs);
+            if(status != 0) { System.err.println(className + " failed with exit status: " + status); System.exit(1); }
+            end();
+            times[i] = diff();
+        }
+        
+        for(int i=0;i<runs;i++)
+            System.out.println("Run " + (i+1) + ": " + times[i] + " sec");
+        java.util.Arrays.sort(times);
+        
+        System.out.println("Best: " + times[0]);
+        System.out.println("Worst: " + times[times.length-1]);
+        float sum = 0.0f;
+        for(int i=2;i<times.length-2;i++)
+            sum += times[i];
+        float avg = sum / (times.length-4);
+        System.out.println("Avg of middle " + (times.length-4) + ": " + avg);
+    }
+}