Applications

Applications are what make computing happen.

Multi-core File Compression

From the getting your cores off the sofa department

Every now and then there are really nifty multi-core applications that help with some of the more mundane Linux HPC chores. The -j option for make is one such example. I recently stumbled upon two other applications that take advantage of multi-core for file compression.

The two packages are parallel gzip and parallel bzip2. As you might surmise, each application uses multiple cores to speed up the compression of large files. I checked to see if these were in the Scientific Linux Yum repository, but they did not show up when I tried to install them. Thus, I decided to build them myself.

Read more: Multi-core File Compression

GPU Programming For The Rest Of Us

One step closer to the "-gpu" option

I'm sure by now everyone has heard that you can run real code on GPU's (Graphical Processing Units). GPUs are the graphics card in your desktop or even the graphic engines running your game consoles at home (never at work - right?). The potential performance improvement for codes or algorithms that can take advantage of the GPU's programming model and do most of their computation on the GPU is enormous. There are cases of over a 100X performance improvement for some codes running on GPUs relative to CPUs.

But there are some limitations to using GPUs for computation. One of the critical limitations is that you have to take your code and rewrite it for the GPU as in the case of Brook+ from AMD or OpenCL from the Kronos Group. Alternatively, you may have to "adapt" your C code to use some extra functions and data types (extensions) in the case of CUDA from NVIDIA. Unfortunately, you just can't take your existing code with a compiler and use a compile option such as "-gpu" to magically build code for the GPU... or can you?

Read more: GPU Programming For The Rest Of Us

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