This bug was fixed in the package openblas - 0.2.6-1
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openblas (0.2.6-1) unstable; urgency=low
* Upload to unstable
* Update Standards-Version to 3.9.4
* Increase the maximum number of threads to 64 when building the generic
package. At runtime, OpenBLAS will not use
** Changed in: openblas (Debian)
Status: New = Fix Released
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https://bugs.launchpad.net/bugs/817212
Title:
Number of threads stuck on two
To manage notifications about this bug
FWIW, this bug is still present in 2.6.1. While I understand that it
might be a sensible idea to define an upper bound on the number of CPUs
used by default, it seems a bit restrictive to be stuck at 2 threads.
Since OpenBLAS comes with kernels that are optimized to the user's
machine anyhow,
it should be fixed in the next revision:
http://anonscm.debian.org/viewvc/debian-science/?view=revisionrevision=45618
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https://bugs.launchpad.net/bugs/817212
Title:
Number of threads
** Bug watch added: Debian Bug tracker #684338
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684338
** Also affects: openblas (Debian) via
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684338
Importance: Unknown
Status: Unknown
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** Changed in: openblas (Debian)
Status: Unknown = New
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https://bugs.launchpad.net/bugs/817212
Title:
Number of threads stuck on two
To manage notifications about this bug go
during compilation the number of threads of the build machine is hardcoded into
the code:
gcc ... -DMAX_CPU_NUMBER=4
apparently the ubuntu build machine had two cores
with these type of libraries it is always better to build them on the machine
your are using them one so you get the optimal
What happens if you do ?
# apt-get source openblas
and type
# fakeroot debian/rules custom
it should produce a package called:
# ../libopenblas-base_*.deb
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When I build the package on my local machine, I get the correct number
of threads, so that works fine.
However, the binary package available in universe for Oneiric and my
attempt to back port it to Natty on launchpad is limited to two threads,
because that is the number of threads available on
