I and others who use ___@ieee.org email addresses have a serious problem in which we occasionally fail to receive certain email messages that are sent our ieee.org addresses. This is a serious problem, and I’ve finally found a solution.
How to fix your IEEE email alias so that it delivers all messages Read More »
This post shows how I set up MATLAB to perform parallel calculations on a multi-core server which is part of an existing cluster that is managed using Torque and Moab. I did this without making any changes to the cluster submission system. The installation documentation for the MATLAB Parallel Computing Toolbox and Distributed Computing Server
Using the MATLAB Distributed/Parallel Computing Toolbox without modifying your cluster Read More »
In my last post, I showed how to install PHPUnit with PHP 5.3 on a CentOS 5.9 system. Today, I will tackle the much simpler task of installing PHPUnit on a CentOS 6.4 system. The task is easier since PHP5.3 is standard on CentOS 6. On my system, PEAR was already installed. Steps: 1. Install
PHPUnit on CentOS 6 Read More »
I recently had to install PHPUnit on a CentOS 5.9 system. This turned out to be a little more complicated than I had anticipated, so I wrote down the procedure in case I had to do it again. Here are my notes: 1. Install php53 packages, not php (php packages install the old 4.x series)
Installing PHPUnit on CentOS 5.9 Read More »
You can do some really cool stuff with Ghostscript on the command line on a computer running Linux or OS X. However, it’s hard to remember all that stuff when you don’t use it very often. I recently learned about a set of command-line PDF manipulation tools called PDFjam. If you are a geek like
Very helpful PDF manipulation tools on Linux Read More »
I run XWindows on a CentOS 5.9 box as a non-root user. To perform administrative tasks, I occasionally log in as root using “su” in a terminal window. However, I found that I was unable to start any GUI applications as root. I got the following error: Xlib: connection to “:0.0” refused by server Xlib:
When root cannot run X applications from a local terminal Read More »
I recently found the following message in the system logs for one of the compute nodes in the STOKES cluster: init: Id “co” respawning too fast: disabled for 5 minutes This caught my attention, because this OS image on this particular node should be identical to the image that is deployed on the rest of
The cause of init: Id “co” respawning too fast, and how to fix it Read More »
GROMACS produces graphical output in the form of .xvg files. These are designed to be viewed with a classic UNIX/Linux plotting program called Grace. If you happen to be using Linux and you have Grace installed, it is very easy to plot the data with the command xmgrace my_file.xvg
How to plot .xvg files from GROMACS on Windows Read More »
Most of the time, RPM (especially in conjunction with yum) is a decent package management solution. However, I can think of two common circumstances when you don’t want to let RPM install a package: You don’t have root permissions on a system such as a shared cluster You are an administrator on a shared cluster
Installing Lumerical FDTD on a linux cluster Read More »
I found an interesting quirk when trying to build an OpenMPI application on a visualization node with a “stock” version of Red Hat Enterprise Linux 5.8. I used mpicc to compile the application and got the following error: $ mpicc hello_world_mpi.c -o hello_world /usr/bin/ld: cannot find -lnuma
OpenMPI, Intel Compilers and RedHat 5: cannot find -lnuma Read More »