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linux.conf.au hackfest: the solution, part three
In part two of this series, we had just ported a fractal renderer to the SPEs on a Cell Broadband Engine machine. Now we're going to start the optimisation... Our baseline performance is 40.7 seconds...
View Articledebian on a qs22 cell blade
Seeing as the QS22 blades are out, here's a short guide to getting debian installed. [jk@qs22 ~]$ grep -m1 ^cpu /proc/cpuinfo cpu : Cell Broadband Engine, altivec supported [jk@qs22 ~]$ lsb_release -d...
View Articleasynchronous spu contexts, initial designs
I've recently been working on some changes to the spufs code, and thought I'd write-up some of the details. At present, the spu_run syscall (used to run a SPU context) blocks until the SPU program has...
View Article2.6.26 on a Lenovo x61 thinkpad
It looks like the iwl driver is slightly broken in the 2.6.26 release - connections will drop-out after 10 seconds or so. The workaround for this is to enable the config option CONFIG_IWL4965_HT.
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new patchwork beta
We've had a new version of patchwork - the web-based patch-tracking system - online for a few weeks now at patchwork.ozlabs.org. After Paul's presentation on patchwork at the 2008 Kernel Summit, there...
View Articleexternal context scheduling in spufs
At present, the spufs code has the invariant that a context is only ever loaded to an SPE when it is being run; ie, a thread is calling the spu_run syscall on the context. However, there are situations...
View ArticleSPE gang scheduling policies
In my previous post here, I mentioned that: We also need to allow contexts to be loaded outside of spu_run to implement gang scheduling correctly and efficiently. I think that may require a little...
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linux.conf.au hackfest: the solution, part four
In the previous article in this series, we finished with a parellel SPE-based fractal renderer. This article will cover some of the major optimisations we can do to make use of the Cell Broadband...
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hiprofile - HTML interactive profiler, version 1.0
I've recently been doing some performance analysis work on Linux, which requires profiling various applications to see how they perform under load. One of the handy tools for profiling this behaviour...
View Articleglobal namespace
[jk@pingu ~]$ mkdir ~/sshfs [jk@pingu ~]$ afuse -o mount_template="sshfs %r:/ %m" -o unmount_template="fusermount -u -z %m" ~/sshfs/ [jk@pingu ~]$ cat ~/sshfs/ozlabs.org/etc/hostname ozlabs [jk@pingu...
View ArticleI've moved!
All of the stuff from this site is now at jk.ozlabs.org. If you're looking for a new RSS feed, you can find that at jk.ozlabs.org/feeds/rss/. See you on the other side!
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