Sorry for the incomplete report. As my understanding on how atlas works
is very limited, I didn't know if you (the packager) added some
debian/ubuntu specific compiler options leading to this result. So I
asked here first because I wondererd if there maybe was a trivial
answer (like setting a specific flag during compilation).
So here is what I did:
disabled CPU throtteling in BIOS
apt-get source atlas
fakeroot debian/rules
installed the package
Open R:
a<-list();for(i in 1:10){a[[i]]<-matrix(rnorm(1e6),1000,1000)} ## create a list
containing large matrices
system.time(lapply(a,solve)) ### measure time of inverting 10 matrices
I also monitored the CPU usage using the gnome system monitor and compared with
the result using the OpenBLAS library.
The latter uses 100% on all cores.
My hardware specs:
CPU: Intel Core2 Quad CPU Q9400 @ 2.66GHz × 4
RAM: 8GB
Ubuntu 12.04 64bit
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https://bugs.launchpad.net/bugs/956753
Title:
custom build of atlas only uses ~70% CPU
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