Monthly Archives: March 2011

POV-Ray II – no free lunch on EC2

In this post, I’ll take a look at some runs of the POV-Ray application available in the GridPilot app store: To import this app, just choose “File → Import application”, navigate to the relevant folder and click “OK”.

This application is a bit more sophisticated than the one used for the simple benchmarking described in a previous post. Now, … Read the rest

Feature extraction of medical images on grids and clouds

This example is special in that it does not depend on any preinstalled software package (runtime environment), but includes a precompiled binary. This binary will of course only for certain run on the system it was compiled on. We compiled on Debian Sarge and Scientific Linux 5 and run on all back-ends: a local virtual machine, GridFactory without virtualization and … Read the rest

MP3 encoding on GridFactory

Here is a video I put together to demo how to use GridPilot to run computations on a GridFactory cluster:

The demo uses the default input files – which are 12 royalty free music files found on This can be changed – by right-clicking on the input dataset, “music_files”, and choosing “Import file(s)”. If you’ve already imported the … Read the rest

MP4 transcoding on EC2 with GridPilot and GridFactory

Things to Come  The Last Man on Earth  Sintel  Elephant’s Dream

Given the popularity of the iPhone, an interesting use of a batch system is conversion of movie files from the AVI to the MPG4 format. In this post I’ll explain 3 ways doing this with GridPilot. Which way you prefer will likely depend on the number and size of files you want to convert and the power … Read the rest

POV-Ray rendering

To gauge the performance of both GridFactory and virtualization layers in a high-CPU/low-throughput setting, we chose the standard ray-tracing program POV-Ray and a standard benchmarking image, shipped with the program.

Povray default benchmark image
The standard image that was rendered.

This example is a fairly naive benchmarking exercise consisting simply in rendering the same image with POV-Ray 20 times. Each POV-Ray job used a … Read the rest