adding randomized values test to prevent caching performance advantages

.gitignore

@@ -1,4 +1,5 @@
 cpp-test
+cpp-test2
 *.swp
 *.swo
 *~

run2.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -x
+
+g++ test2.cpp -o cpp-test2
+
+time pypy test2.py
+time ./cpp-test2

test2.cpp

@@ -0,0 +1,66 @@
+#include <iostream>
+#include <cstdlib>
+
+class Vector {
+	protected:
+	float a,b,c;
+
+	public:
+
+	Vector(float a, float b, float c) {
+		this->a = a;
+		this->b = b;
+		this->c = c;
+	}
+
+	float dot(Vector other) {
+		return this->a * other.a + this->b * other.b + this->c * other.c;
+	}
+
+	Vector cross(Vector other) {
+		return Vector(
+			this->b * other.c - this->c * other.b,
+			this->c * other.a - this->a * other.c,
+			this->a * other.b - this->b * other.a
+		);
+	}
+
+	void print() {
+		std::cout << "[ " << this->a << ", " << this->b << ", " << this->c << " ]" << std::endl;
+	}
+};
+
+int * randomList(unsigned int size) {
+	int * l = new int[size];
+
+	for (unsigned int i=0; i<size; i++)
+		l[i] = rand();
+
+	return l;
+}
+
+int main() {
+
+	unsigned int loops = 5e7;
+	unsigned int counter = 0;
+
+	std::cout << "looping " << loops << " times" << std::endl;
+
+	int * l = randomList(loops);
+
+	for(unsigned int i=0; i < loops; i++) {
+		Vector v1(1*l[i],2*l[i],3*l[i]);
+		Vector v2(9*l[i],8*l[i],7*l[i]);
+		v1.dot(v2);
+		v1.cross(v2);
+		counter++;
+	}
+
+	std::cout << "counter = " << counter << std::endl;
+
+//	v1.print();
+//	v2.print();
+//	std::cout << v1.dot(v2) << std::endl;
+//	v1.cross(v2).print();
+
+}

test2.py

@@ -0,0 +1,52 @@
+import random
+
+class Vector(object):
+	def __init__(self):
+		self.a = 0.0
+		self.b = 0.0
+		self.c = 0.0
+
+	def __init__(self, a, b, c):
+		self.a = a
+		self.b = b
+		self.c = c
+
+	def __str__(self):
+		return "[ %s, %s, %s ]" % ( str(self.a), str(self.b), str(self.c) )
+
+	def dot(self, other):
+		return self.a * other.a + self.b * other.b + self.c * other.c
+
+	def cross(self, other):
+		v = Vector(
+			self.b * other.c - self.c * other.b,
+			self.c * other.a - self.a * other.c,
+			self.a * other.b - self.b * other.a
+			)
+		return v
+
+def randomList(size):
+	return [random.randint(0,4294967295) for n in range(size)]
+
+def main():
+
+	loops = int(5e7)
+	counter = 0
+
+	l = randomList(loops)
+
+	print "looping %s times" % loops
+
+	for i in range(loops):
+		v1 = Vector(1*(i % l[i]),2*(i % l[i]),3*(i % l[i]))
+		v2 = Vector(9*(i % l[i]),8*(i % l[i]),7*(i % l[i]))
+		v1.dot(v2)
+		v1.cross(v2)
+		counter = counter + 1
+
+	print "counter = %s" % counter
+	print v1
+	print v2
+	print v1.dot(v2)
+	print v1.cross(v2)
+main()