Description of problem:
cblas_dgemm generates illegal instruction error for large arrays.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
int main(int argc, char **argv)
static double a[1000*1000];
static double b[1000*1000];
static double c[1000*1000];
double alpha=1, beta=0;
cblas_dgemm(CblasRowMajor, CblasNoTrans, CblasNoTrans, 1000, 1000, 1000,
alpha, a, 1000, b, 1000, beta, c, 1000);
gcc -L/usr/lib64/atlas -lcblas blas_error.c -o blas_error
This is a 64 bit problem with large arrays, it doesn't occur on 32 bit machines
or with smaller arrays. My machine is
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 3.40GHz
The bug also appears with Ubuntu Dapper and there is a similar report in the
octave mailing list.
Atlas-2.7.30 compiled on my machine works fine for the test program.
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This bug is open for a Fedora version that is no longer maintained and
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