by Andrew Johnstone
I Spent a little while yesterday investigating why memcached causes problems with multigets returning results and ended up comparing debian vs ubuntu. I tested from virtual machines and physical hardware of relative specs. I have also tried a combination of libmemcached libraries and tuned the tcp stack, however here are some of the results from […]
In: Linux
17 Jul 2010It’s very rare that I setup FTP servers on our production environments and always forget parts of the configuration, so figured I would list it here. Active and Passive FTP There are two types of modes active and passive FTP, using normal or passive FTP, a client initiates a session by sending a request to […]
In: Linux
22 May 2010I wrote a few munin plugins to monitor memory, CPU and IO usage per process. After collecting the stats for a few days I noticed that MySQL CPU usage had a constant value of 9.1, however all other processes collected CPU usage correctly.. CPU usage proc=mysqld value=$(ps u -C $proc | awk ‘BEGIN { sum […]
The Project I was recently working on a project to expose our trading systems via XmlRpc, Rest and SOAP. It was quite an interesting project, which took two of us three weeks to develop (Amongst other things). This involved creating a testbed, that would automatically generate the payload and response for each protocol. The parameters […]
I’ve had alot of experience with other programming languages, however I had to learn C++ from scratch in a very short period of time, a number of weeks ago. This was to develop a real-time stock quote client, the goal was simply to push data from remote servers into our databases, filter what messages it […]
Recently I had to install memcache on a number of servers, and I would always tend to end up with errors whilst memcache tries to locate libevent. I always seem to forgett LD_DEBUG, so I figured I would write up the process for installing memcache. One of the dependencies of memcache is libevent, so firstly […]
recently read “Binaries Belong in the Database Too” on sitepoint.com, and thought I would shed some light with regard to my experience of storing files in databases. I’m sure many of you have known this to be a taboo practice, and I would certainly agree depending on the database. A project I worked on for […]
In: PHP
1 Aug 2006It’s been some time since I last posted, due a rather hectic schedule and today I fly off to Loret De Mar, Spain for a week with the lads and two weeks after that to Miami. I’m sure this will help to take my mind of things. As with anything you constantly learn from your […]
I wrote this a while ago, whilst playing with SQL Injection, however a little unfinished, the idea was to try to write out entire files, through an SQL Injection attack. I thought I would expand, on my previous post Exceptions, Exceptions, Exceptions, and see what is possible with a simple a SQL Injection attack. I […]
In: General
6 Jul 2006After toying with some XPath’s and a fair amount of XSL lately (& getting lost in XPath), I feel it would be wise to place something here to look back on… Marcus Tucker, introduced me to Stylus Studio of which I am very thankful as XmlSpy didn’t help me to deduce the problem with one […]
I have been a developer for roughly 10 years and have worked with an extensive range of technologies. Whilst working for relatively small companies, I have worked with all aspects of the development life cycle, which has given me a broad and in-depth experience.