forgot to add versioninfo(): julia> versioninfo() Julia Version 0.3.0-prerelease+2921 Commit ea70e4d* (2014-05-07 17:56 UTC) Platform Info: System: Linux (x86_64-linux-gnu) CPU: Intel(R) Xeon(R) CPU X5690 @ 3.47GHz WORD_SIZE: 64 BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY) LAPACK: libopenblas LIBM: libopenlibm
El domingo, 18 de mayo de 2014 11:33:45 UTC+2, Carlos Becker escribió: > > This is probably related to openblas, but it seems to be that tanh() is > not multi-threaded, which hinders a considerable speed improvement. > For example, MATLAB does multi-thread it and gets something around 3x > speed-up over the single-threaded version. > > For example, > > x = rand(100000,200); > @time y = tanh(x); > > yields: > - 0.71 sec in Julia > - 0.76 sec in matlab with -singleCompThread > - and 0.09 sec in Matlab (this one uses multi-threading by default) > > Good news is that julia (w/openblas) is competitive with matlab > single-threaded version, > though setting the env variable OPENBLAS_NUM_THREADS doesn't have any > effect on the timings, nor I see higher CPU usage with 'top'. > > Is there an override for OPENBLAS_NUM_THREADS in julia? what am I missing? >
