Re: Read the number of cpus on Linux

[John W. Eaton]

On 21-Jul-2010, Francesco Potortì wrote:

| >>>If you have GNU coreutils 8.1 or later, you can do
| >>>   [err,numprocs] = system("nproc")
| >>
| >> Isn't this less efficient, systemwise?
| >
| >Are you planning to check millions of times in a for loop if the
| >number of cores in your system has changed?
| 
| No, but in general having a function less heavy on the system is a plus,
| because you never know how it will be used in the future.
| 
| Probably it is not important in this case, because it should be called
| at most once per invocation of parcellfun, so the overhead should be
| negligible.

I see an nproc module in gnulib that appears to be portable to current
systems of interest:

  http://www.gnu.org/software/gnulib/MODULES.html#module=nproc

So, it should be fairly easy to use this to write a function to do
what you want, at least for the development version of Octave which
already uses gnulib.

Would someone like to contribute a function for this purpose?

jwe