Math in Genealogy is a great project (donate online). Sven Köhler from Potsdam, Germany has written a python script for visualizing the database, which I’m going to try. First step is to clone the git repo: $ git clone git@github.com:tzwenn/MathGenealogy.git His instructions are quite simple: $ ./genealogy.py –search 38586 # 30 seconds $ ./genealogy.py –display […]
Playing with GraphViz and MathGenealogy data Read More »
Warning: This is not a very interesting post. I’m toying around with the Redis benchmarking tool. What would be significantly more interesting would be to toy around with the Lua API in Redis, which I’ll do in a subsequent post. In this post, I’ll try to squeeze as many get/set requests out of Redis as
How many requests per second can I get out of Redis? Read More »
The profiling tool in GNU is called gprof. Here is a short, boring example of how to use it. 1) Write hello world in C (hello.c) #include int foo() { int b = 54324; int j; for (j=0; j < 1000000; j++) { b = b^j; } return b; } int main() { int a
Hello GNU profiling Read More »
The two main things to do with a memcached cluster is getting a key and setting a key to a value. Below are examples of this, with parameters explained (something most examples miss for some reason?). Examples Connect to memcached: telnet [hostname] [port] telnet localhost 11211 Getting a key: get [key] get foo # get
Summary of memcached commands as used through telnet Read More »
In the following I’m using a server from Webfaction, and my Tornado source code is hosted on Github. Some things are specific to those providers, but should be very easy to adapt. The following is organized into two sections.
Deploying a Tornado project in production using Github and WebFaction. Read More »
To build nginx on Mac OS X Snow Leopard, I use the following options to configure ./configure –with-ld-opt=”-L/usr/local/lib” –with-cc-opt=”-I/usr/local/include” If the ld and cc options are not given, it results in an error reported in a ticket on the nginx trac. Notice that the is no space between -L and /usr/local/lib and likewise for -I
Installing nginx on Mac with pcre library Read More »
To benchmark a HTTP server, you can use the command-line utility Apache Bench (command ab). If you have Python installed, you can start a HTTP server, e.g. running on port 10000, in any directory of your system. It will serve the files in that directory and sub-directories. Start it like this: $ python -m SimpleHTTPServer
Testing performance of HTTP server with Apache Bench Read More »
I use two ways to manage paths in Mac OS X: ~/.profile /etc/paths.d I use the first option when trying things out, and the second for managing the path more permanently. Example And example of the using /etc/paths.d to include the git executable in PATH: edit /etc/paths.d/git Add line: /usr/local/git/bin When you start a new
How to manage PATH in Mac OS X Read More »
You have a file sitting on your disc. You want to put a copy of the contents in your OS “clip board” so that you can paste it somewhere, e.g. on a website, without having to open the file in a text editor, selecting everything and hitting the COPY key combination, say Command-C on a
How to copy a file to “clip board” memory Read More »