It is hard to know how to describe my code. So I tried to run it with the
generic version which does use 200% of CPU. So there seems something
different with the Ubuntu version of Julia.
I installed under my home folder. I ran it in the following way hoping
that the shared libs are not mixed with the system ones.
$ ~/Software/julia-2ac304dfba/bin/julia
_
_ _ _(_)_ | A fresh approach to technical computing
(_) | (_) (_) | Documentation: http://docs.julialang.org
_ _ _| |_ __ _ | Type "?help" for help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 0.4.5 (2016-03-18 00:58 UTC)
_/ |\__'_|_|_|\__'_| | Official http://julialang.org/ release
|__/ | x86_64-unknown-linux-gnu
On Sunday, April 24, 2016 at 7:18:48 PM UTC+5:30, Milan Bouchet-Valat wrote:
>
> Le dimanche 24 avril 2016 à 05:38 -0700, K leo a écrit :
> >
> > See below.
> >
> > > Le samedi 23 avril 2016 à 18:10 -0700, K leo a écrit :
> > > > > Le samedi 23 avril 2016 à 04:52 -0700, K leo a écrit :
> > > > > Anyway,
> > > > > the Ubuntu PPA is no longer maintained. The recommended solution
> is to
> > > > > use generic Linux binaries from the Julia website.
> > > > >
> > > >
> > > > On Ubuntu 16.04, Julia 0.4.5 is available on multiverse repository
> > > > for some reason. Not sure who maintains it.
> > > Ah, OK, I thought you were using the PPA package. Anyway, Ubuntu
> 16.04
> > > includes the latest OpenBLAS and the Julia package depends on it, so
> it
> > > should be good. That said, maybe that OpenBLAS library doesn't use
> > > threading.
> > >
> > > Can you confirm that running
> > > x=rand(10000,10000);
> > > x*x
> > > does not make Julia use more than 100% CPU?
> > It actually uses close to 200% of CPU.
> OK, so no problem in this area.
>
> I think you'll have to give more details about the code you mentioned
> in your first post for us to be able to help. Also, please confirm that
> you see the same problem (i.e. code using only one core) with the
> generic Linux binaries.
>
>
> Regards
>
> > > If not, could you post the output of versioninfo()? Finally, please
> run
> > > 'ls -l /usr/lib/julia/', 'ls -l /usr/lib64/julia' from a shell and
> copy
> > > the result.
> > julia> versioninfo()
> > Julia Version 0.4.5
> > Commit 2ac304d (2016-03-18 00:58 UTC)
> > Platform Info:
> > System: Linux (x86_64-linux-gnu)
> > CPU: Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
> > WORD_SIZE: 64
> > BLAS: libopenblas (NO_LAPACKE DYNAMIC_ARCH NO_AFFINITY Haswell)
> > LAPACK: libopenblas
> > LIBM: libopenlibm
> > LLVM: libLLVM-3.8
> >
> > $ ls -l /usr/lib/julia/
> > ls: cannot access '/usr/lib/julia/': No such file or directory
> >
> > $ ls -l /usr/lib/x86_64-linux-gnu/julia
> > total 26440
> > lrwxrwxrwx 1 root root 20 Apr 18 17:45 libarpack.so ->
> ../../libarpack.so.2
> > -rw-r--r-- 1 root root 15608 Apr 18 17:45 libccalltest.so
> > lrwxrwxrwx 1 root root 22 Apr 18 17:45 libcholmod.so ->
> ../libcholmod.so.3.0.6
> > lrwxrwxrwx 1 root root 22 Apr 18 17:45 libdSFMT.so ->
> ../libdSFMT-19937.so.1
> > lrwxrwxrwx 1 root root 25 Apr 18 17:45 libfftw3f_threads.so ->
> ../libfftw3f_threads.so.3
> > lrwxrwxrwx 1 root root 24 Apr 18 17:45 libfftw3_threads.so ->
> ../libfftw3_threads.so.3
> > lrwxrwxrwx 1 root root 15 Apr 18 17:45 libgmp.so ->
> ../libgmp.so.10
> > -rw-r--r-- 1 root root 1175608 Apr 18 17:45 libjulia.so
> > lrwxrwxrwx 1 root root 15 Apr 18 17:45 libmpfr.so ->
> ../libmpfr.so.4
> > lrwxrwxrwx 1 root root 22 Apr 18 17:45 libopenblas.so ->
> ../../libopenblas.so.0
> > lrwxrwxrwx 1 root root 19 Apr 18 17:45 libopenlibm.so ->
> ../libopenlibm.so.2
> > lrwxrwxrwx 1 root root 22 Apr 18 17:45 libopenspecfun.so ->
> ../libopenspecfun.so.1
> > lrwxrwxrwx 1 root root 18 Apr 18 17:45 libpcre2-8.so ->
> ../libpcre2-8.so.0
> > -rw-r--r-- 1 root root 203048 Apr 18 17:45 libRmath-julia.so
> > lrwxrwxrwx 1 root root 19 Apr 18 17:45 libspqr.so ->
> ../libspqr.so.2.0.2
> > lrwxrwxrwx 1 root root 32 Apr 18 17:45 libsuitesparseconfig.so ->
> ../libsuitesparseconfig.so.4.4.6
> > -rw-r--r-- 1 root root 6000 Apr 18 17:45 libsuitesparse_wrapper.so
> > lrwxrwxrwx 1 root root 22 Apr 18 17:45 libumfpack.so ->
> ../libumfpack.so.5.7.1
> > -rw-r--r-- 1 root root 25664120 Apr 18 17:45 sys.so
> >
> > $ ls -l /usr/lib64/julia
> > ls: cannot access '/usr/lib64/julia': No such file or directory
> >
> > >
> > > I'm Ccing Graham Inggs, who maintains the Debian package on which the
> > > Ubuntu package is based.
> > >
> > >
> > > Regards
>
