Month: April 2013

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0x5f3759df – calculating inverse square root

This post has moved to eklausmeier.goip.de/blog/2013/04-30-0x5f3759df-calculating-inverse-square-root.

An interesting article in Wikipedia on calculating a first approximation of the inverse of the square root Fast inverse square root, or 0x5f3759df – calculating inverse square root

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linux-3.9: Compile times

This post has moved to eklausmeier.goip.de/blog/2013/04-30-linux-3-9-compile-times.

Compare linux-3.8.4: Compile times. This time we compiled Linux kernel 3.9 and used

time make -j 20

according Compiler Speed-up.

My 8-core machine is fully loaded, as can be seen by top:

Continue reading →

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Max Planck Institut fĂĽr Astrophysik: The Millennium Simulation Project

This post has moved to eklausmeier.goip.de/blog/2013/04-27-max-planck-institut-fur-astrophysik-the-millennium-simulation-project.

Article on Max Planck Institute Millenium Simulation.

Pictures of the galaxy distribution

Addendum: There is an article on the Millenium Simulation in Brian Koberlein’s article Sim Universe.

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Brian Koberlein on Google+: Astronomy Blog

This post has moved to eklausmeier.goip.de/blog/2013/04-27-brian-koberlein-on-google-astronomy-blog.

Brian Koberlein on Google+ on Astronomy contains a number of interesting articles on current developments in astronomy and relativity.

Brian Koberlein on Google+

Added 31-Aug-2013: Brian Koberlein now has a WordPress powered separate web presence: www.briankoberlein.com.

Added 21-Oct-2013: Brian Koberlein noted that he now has 25,000 followers in Google+.

Added 01-May-2014: Brian Koberlein now has 32.000 followers and 22 million views on Google+.

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Counting to Ten on Linux

This post has moved to eklausmeier.goip.de/blog/2013/04-21-counting-to-ten-on-linux.

Very good article on timing CPU bound application.

Random ASCII - tech blog of Bruce Dawson

I recently discovered a Linux shell script that was running slowly due to an inefficiently implemented loop. This innocent investigation ended up uncovering misleading information from time and a bad interaction between the Linux thread scheduler and its CPU power management algorithms.

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