int pastTime;

int numTimings = 1000; //number of Timings taken for each frameRate
int[] timings = new int[numTimings]; //stores the times
int i = 0; //counts the timings
int j = 0; //counter for frameRates

int[] testRates = {
  60, 100, 200, 500, 1000};

String output;

PFont font;

void setup() {
  output = "";
  frameRate(200);
  size(640,640);
  background(0);
  font = loadFont("Arial-10.vlw");
  textFont(font, 10);
  text("Testing with " + numTimings + " draw cycles for " + testRates.length + " test Rates....",20,20);
  println("======================================================");
  output += "======================================================\n";
}

void draw() {

  if (i < numTimings) {  
    timings[i] = millis()-pastTime;
    pastTime = millis();
    i++;
  }
  else {
    results(testRates[j]);
    if (j < testRates.length - 1) {
      i = 0;
      j++;
      frameRate(testRates[j]);
    }
    else {
      noLoop(); //stop the whole thing
      text(output, 20, 40, width-20, height-20);
    }
  }
}

void results(int rate) {

  timings = sort(timings);
  int item = timings[0];
  int itemCount = 1; 

  println("Rate was " + rate);
  output += "Rate was " + rate + "\n";
  for (i = 0; i < timings.length; i++) {
    if (timings[i] == item) {
      itemCount++;
    }
    else {
      println(item + " " + itemCount + "x");
      output += item + " " + itemCount + "x\n";
      item = timings[i];
      itemCount = 1;
    }
  }
  println("--------------------------------------------");
  output += "--------------------------------------------\n";
}