LUG: Death to Matlab - Fri, 18 Nov 2005 11:57:58 -0500

Subject : LUG: Death to Matlab

From : Jack Neely <jjneely@pams.ncsu.[redacted]>

Date : Fri, 18 Nov 2005 11:57:58 -0500

Brian,

Thanks for the feed back. That's good to hear about SP3. I'll see if I
can get my grubby little hands on that version.

What I was starting to find particularly odd is that I could get 6.5 to
run bench on RHEL 4 just fine. Also, that 7 crashed with the same
frequency if not more on RHEL 3.

Jack

On Thu, Nov 17, 2005 at 05:11:15PM -0500, Brian Michael Adams wrote:
> Jack (all),
>
> The problem with Matlab 7 'bench' on WS4 seems to be more elusive than I
> thought too. Based on
> http://www.mathworks.com/support/solutions/data/1-11D20K.html?solution=1-11D20K
> and other articles, I thought it was just that the BLAS .so library they
> ship didn't work with glibc 2.3.4 (the default on RHEL WS4).
>
> For 7 and 7SP2 once upon a time I was able to eliminate the problem by
> swapping out the Matlab BLAS for Intel's MKL, which affirmed the potential
> BLAS problem. (This was on Realmkit boxes.)
>
> However, I've since run 'bench' with Matlab 7, 7SP2, and 7SP3 on RHEL4
> (glibc-2.3.4-2.13, not at NCSU) and the failures don't seem related to
> BLAS (i.e. the LU or FFT portions of bench which rely on BLAS aren't
> crashing):
> --> 7 (7.0): seg faults on completion of bench
> --> 7SP2 (7.0.4): seg faults on 2-D graphics
> --> 7SP3 (7.1): I can't reproduce the problem (again not realmkit boxes)
> You may get some mileage by using SP3. Maybe they updated their libraries
> to work with glibc-2.3.4 (the file sizes are different), but there's no
> evidence on their site or release notes.
>
> I have also tried setting env. var BLAS_VERSION to either atlas_P4.so or
> libmwblas.so -- doesn't make a difference (just changes where during
> bench it crashes). I've seen some comments suggesting the problem is
> related to OpenGL in some circumstances.
>
> Ok enough coredump. I'm curious if you have the problem with SP3...
> Brian
--
Jack Neely <jjneely@ncsu.[redacted]>
Campus Linux Services Project Lead
PAMS Computer Operations at NC State University
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