Finally found a page which includes some instructions on how to get all those fancy buttons working on my Logitech mouse.
A weird little bug…
Yup. There is a weird little bug in numpy… sort of. You only need to watch out for it when subclassing numpy arrays (assuming that the subclasses you are using have avoided it.) Check out my stack overflow post about it. I’m not 100% sure, but it might just be a Python 2 thing.
librdmacm errors when using openmpi
This information can be found elsewhere, but I figured that it’s worth reposting. The bottom line here are errors that look like:
librdmacm: Warning: couldn't read ABI version.
librdmacm: Warning: assuming: 4
librdmacm: Fatal: unable to get RDMA device list
--------------------------------------------------------------------------
[[13473,1],0]: A high-performance Open MPI point-to-point messaging module
was unable to find any relevant network interfaces:
Module: OpenFabrics (openib)
Host: a_server
Another transport will be used instead, although this may result in
lower performance.
--------------------------------------------------------------------------
librdmacm: Warning: couldn't read ABI version.
librdmacm: Warning: assuming: 4
librdmacm: Fatal: unable to get RDMA device list
Are a direct result of your openmpi implementation looking for infiniband hardware. You can turn off this by plugging the equally criptic option -mca btl ^openib into your command line call of whatever programme you are running.
The option -mca btl ^openib specifies that the option ^openib is passed to the “MCA” module btl. This is a specification of what type of communication to use between nodes. The man page for mpiexec is here, here is another useful post about this and here is some more additional information about mca parameters.
Enjoy!
An article that I meant to post to twitter… but it’s too late now.
http://www.sciencedaily.com/releases/2012/04/120425094352.htm
On level sets of the Lorentzian distance function
The paper in question quotes reference “[1]” a lot. Reference [1] of the paper is “Particle physics and inflationary cosmology“. A book for which some of the pages referenced are in the index or bibliography.
I think the correct reference is “Global Lorentzian Geometry“.
If you’ve stumbled here then no doubt we’re doing research on something related, so flick me an email and let me know what you’re looking into.