b0urb4k1

(*
This script analyzes the dependencies between top level types in a .NET Assembly.
It is then used to compare the dependency relationships in some F# projects with those in some C# projects.

Note that no attempt has been made to optimize the code yet! 

REQUIRES:

* Mono.Cecil for code analysis
  From http://www.mono-project.com/Cecil#Download 

b0urb4k1

void PointCloud::computeCovarianceMatrix() {
	double means[3] = {0, 0, 0};
	for (int i = 0; i < points.size(); i++)
		means[0] += points[i].x,
		means[1] += points[i].y,
		means[2] += points[i].z;
	means[0] /= points.size(), means[1] /= points.size(), means[2] /= points.size();
	
	for (int i = 0; i < 3; i++)
		for (int j = 0; j < 3; j++) {

b0urb4k1

// Credits: John Stewien
// From: http://code.cheesydesign.com/?p=572

/*
Reading the Portable Executable (PE) header in C#
My job consists of writing fully custom applications for groups of people. The time pressure of these projects is quite high, so generally people start using the application while I’m still writing it, which means I write it modularly and add features as I go along. I also fix bugs as they are discovered. My clients are 2 tiered where expert users get a new build first, they test if for a while, and if they think it’s acceptable they then pass it on to others.

This method of distribution is quite ad-hoc so when a client rings me up and asks me to view their screen to look at something, it’s useful to know what build they are running. To facillitate this I print the link date in the main Window Title so I instantly have an idea about how old the version is that I am looking at. This date is calculated at run time. To do this requires reading in the Portable Executable (PE) header from th

b0urb4k1

On the topic of data locality and performance

Full source code can be found here

It is well-known that a hard disk has a long delay from that we request the data to that we get the data. Usually we measure the hard disk latency in milliseconds which is an eternity for a CPU. The bandwidth of a hard disk is decent good as SSD:s today can reach 1 GiB/second.

What is less known is that RAM has the same characteristics, bad latency with good bandwidth.

You can measure RAM latency and badndwidth using Intel® Memory Latency Checker. On my machine the RAM latency under semi-high load is ~120 ns (The 3r:1w bandwidth is 16GiB/second). This means that the CPU on my machine has to wait for ~400 cycles for data, an eternity.