High Performance Computing (HPC) blog

Dangling pointers are pointers whose memory has been freed but which have not been set to null (or 0x0). This allows a particularly tricky class of bug to arise...

I expected a very straightforward tuning process – after all, this code has been a staple of the HPC community for decades – but as it turns out I was in for a surprise!

In Part 1 I ran Discovar, a life sciences genome assembly code, on one of our internal systems and optimized it to run the benchmark code 7% faster. Of course, physical hardware often performs very differently…

Python is pretty commonplace in scientific computing these days. It is easy to code and powerful - but numerical computation is not a strength that Python has.

We're going to see what Arm MAP 5.0 can do by profiling three versions of a simple PI calculator program with some added I/O for good fun

Arm Forge is a development tool suite for developing, debugging and optimizing CUDA and OpenACC codes - from GeForce to Tesla and the Kepler K80.

OpenFOAM, developed by ESI-OpenCFD is one of the most popular tools for developing CFD (Computational Fluid Dynamics) applications, along with ANSYS Fluent or CD-Adapco Star-CCM+.

Arm DDT and Arm MAP are excellent tools for finding program flaws and performance issues – they are also very helpful for studying codes and coding techniques.

Today, using one of the early examples from the CUDA toolkit, I’m going to introduce a neat feature of CUDA 5 and CUDA 5.5 - dynamic parallelism - and how to use Arm DDT to debug it.

Memory leaks are a killer of long running applications - memory usage keeps growing until finally the memory supply is exhausted and it's "game over". If you’re lucky the system recognizes your application…

One of the great things about working at Allinea Software is meeting developers with real problems and improving their lives. When you have a tool that transforms the daily report to the boss from “still…

It's January 2012 and I'm sitting on a cross-Atlantic flight. Sweat is beading on my brow and it's nothing to do with the cabin temperature. I am not a happy bunny. I'm a very unhappy bunny and somebody…

We humans can survive in almost every environment on our planet and are beginning to step off it. We command fire hotter than the core of a star and freeze atoms at temperatures cooler than the depths…