For example can I have Atlas, OpenBlas, MKL installed on my Ubuntu 14.04 at the same time and switch between them without recompiling Caffe?
You could also do it without changing system wide settings, for example by adding the library you want to use to the LD_PRELOAD
or LD_LIBRARY_PATH
environment variables. The first library on this path will be the one used to resolve the symbols against.
For example, you could run with
LD_PRELOAD=/path/to/blas/lib.so ./my_executable_using_caffe
You can see that this approach would be extremely useful as part of a benchmarking script for different implementations since it doesn't affect the benchmarking environment itself. For example (in bash):
my_libraries=/path/to/blas1.so /path/to/blas2.so
for lib in $my_libraries
do
LD_PRELOAD=${lib} ./my_executable_using_caffe
done
This approach, based on dynamic linking, applies to any other shared library your program is compiled against.
Sure, you have to have them installed, and on Ubuntu/Debian issue command
update-alternatives --config libblas.so.3
You'll get numbered list of alternatives and could switch between them easily
Link: https://wiki.debian.org/DebianScience/LinearAlgebraLibraries
Yes, you can. You just need to use dynamic library linking.
The libblas.so.3
is a soft linking to /etc/alternatives/libblas.so.3
Which in turn points to the BLAS
library implementation
For example if you installing Atlas
(sudo apt-get install libatlas3-base
):
/usr/lib/libblas.so.3 -> /etc/alternatives/libblas.so.3
/etc/alternatives/libblas.so.3 -> /usr/lib/atlas-base/atlas/libblas.so.3
while after installing Openblas
(sudo apt-get install libopenblas-base
):
/usr/lib/libblas.so.3 -> /etc/alternatives/libblas.so.3
/etc/alternatives/libblas.so.3 -> /usr/lib/openblas-base/libblas.so.3
Of course you can use your own soft link to your library builds.
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