MATLAB Central Newsreader - MATLAB segmentation violation on matrix multiplication

MATLAB segmentation violation on matrix multiplication

Aditya Rawal — Sat, 07 Nov 2009 02:16:03 -0500

Here is my code:

clear;
clc;
v_temp1 = zeros(2,2);

A = [4 2 ; 2 4];
M_matrix = [1 1 ; 1 1];
C = A * M_matrix

Interestingly i get segmentation fault whenever i fire this code on a CPU cluster, but it ofcourse runs well on my local machine. I am sure there is some setup issue, but don't know what...
Another thing is that when i replace the multiplication operator with addition/subtraction, it works...

Here is the error that i am getting..
------------------------------------------------------------------------
       Segmentation violation detected at Fri Nov 6 20:13:51 2009
------------------------------------------------------------------------

Configuration:
  MATLAB Version: 7.5.0.338 (R2007b)
  MATLAB License: 168993
  Operating System: Linux 2.6.24.6+desktop10+25.63 #1 SMP Thu Nov 5 15:03:22 CST 2009 i686
  GNU C Library: 2.7 stable
  Window System: No active display
  Current Visual: None
  Processor ID: x86 Family 6 Model 7 Stepping 6, GenuineIntel
  Virtual Machine: Java 1.6.0 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode, sharing
  Default Charset: US-ASCII

Register State:
  eax = 00000000 ebx = 44598510
  ecx = 00000000 edx = 00000002
  esi = 44eedaac edi = 00000000
  ebp = 4459fd00 esp = 44eeba18
  eip = 43c8f761 flg = 00010246

Stack Trace:
  [0] mkl.so:SearchPath~(0x645f6c6d, 0x732e6665, 111, 0) + 41 bytes

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    /tmp/matlab_crash_dump.26316

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A technical support engineer might contact you with further information.

Thank you for your help. Save your workspace and restart MATLAB.

Re: MATLAB segmentation violation on matrix multiplication

James Tursa — Sat, 07 Nov 2009 03:08:02 -0500

"Aditya Rawal" <aditya@cs.utexas.edu> wrote in message <hd2l93$f06$1@fred.mathworks.com>...
> Here is my code:
>
> clear;
> clc;
> v_temp1 = zeros(2,2);
>
> A = [4 2 ; 2 4];
> M_matrix = [1 1 ; 1 1];
> C = A * M_matrix
>
> Interestingly i get segmentation fault whenever i fire this code on a CPU cluster, but it ofcourse runs well on my local machine. I am sure there is some setup issue, but don't know what...
> Another thing is that when i replace the multiplication operator with addition/subtraction, it works...

Matrix multiplication calls a BLAS library function, whereas add/subtract do not. I suspect your cluster MATLAB is loading an incompatible version of the BLAS libraries to compute with, but I don't know how to fix your problem. Do you have mixed 64-bit and 32-bit versions installed?

James Tursa

Re: MATLAB segmentation violation on matrix multiplication

Aditya Rawal — Sat, 07 Nov 2009 07:38:03 -0500

Hi James,

How do i find if i have both 32 bit and 64 bit installed?

Thanks
Aditya

"James Tursa" <aclassyguy_with_a_k_not_a_c@hotmail.com> wrote in message <hd2oai$f1d$1@fred.mathworks.com>...
> "Aditya Rawal" <aditya@cs.utexas.edu> wrote in message <hd2l93$f06$1@fred.mathworks.com>...
> > Here is my code:
> >
> > clear;
> > clc;
> > v_temp1 = zeros(2,2);
> >
> > A = [4 2 ; 2 4];
> > M_matrix = [1 1 ; 1 1];
> > C = A * M_matrix
> >
> > Interestingly i get segmentation fault whenever i fire this code on a CPU cluster, but it ofcourse runs well on my local machine. I am sure there is some setup issue, but don't know what...
> > Another thing is that when i replace the multiplication operator with addition/subtraction, it works...
>
> Matrix multiplication calls a BLAS library function, whereas add/subtract do not. I suspect your cluster MATLAB is loading an incompatible version of the BLAS libraries to compute with, but I don't know how to fix your problem. Do you have mixed 64-bit and 32-bit versions installed?
>
> James Tursa