Here’s an interesting bit I ran into few days ago. I got curious how is that less (or more) can read file contents from standard input and yet it is able to process input that comes from user. Both of them come from standard input, yet these are quiet heterogeneous streams of information. So, how […]
Recently I looked for a solution to this little problem. how do you, programmatically, delete a symbolic link and a file that it points to? One problem that you should take care of when tackling this problem, is that symbolic link can point to a symbolic link. Then symbolic link should also point to symbolic […]
Doing file I/O of any kind in Python is really easy. You can start with plain open() and friends, working with Python’s file objects. by the way, Python’s open() resembles C‘s fopen() so closely that I can’t stop thinking that open() may be based on fopen(). When its not enough, you can always upgrade to […]
When considering ways to spread interrupts from one device among multiple cores, I can’t not to mention MSI-X. The thing is that MSI-X is actually the right way to do the job. Interrupt affinity, which I discussed here and here, has a fundamental problem. That is inevitable CPU cache misses. To emphasise this, think about […]
Table of contents Introduction to the series Introduction to the article Way of working with Bazaar Demo setup description Directory and user configuration The basics Creating a project Checking-out the project Adding files to the project Committing files Few words about revision numbers in Bazaar Local commits or offline commits Committing local commits to remote […]
Table of contents Introduction to the series Introduction to the article Way of working with Bazaar Demo setup description Directory and user configuration The basics Creating a project Checking-out the project Adding files to the project Committing files Few words about revision numbers in Bazaar Local commits or offline commits Committing local commits to remote […]
Update 06/16/2009: On several occasions, commentators to this article pointed out that this post is somewhat incomplete. Therefore, before I continue, I would like to make some things clear. Before considering the code below, please note that spinlocks are totally useless on uni-processor computers. This is due to a nature of spinlocks, which I will […]
There are plenty of virtualization technologies. There are organizations like VMware, VirtualBox and XEN, whose virtualization allows one to run several virtual computers using one physical computer. I worked at a company called ScaleMP. ScaleMP’s technology, vSMP, turns multiple physical computers into one large computer. Today I was looking for something different. I was looking […]
In this article I cover in depth Python’s optparse module. It presents most useful recipes and is a good handbook when parsing command line options in a Python program.
This article introduces signals in Linux to the reader. It explains the nature of signals, how to use them and gives few small use examples.