This well-known standard benchmark is a Fortran program for the solution of (100 X 100) dense set of linear equations by Gaussian elimination. It is distributed by Jack Dongarra of the University of Tennessee [8]. The results are quoted in Mflop/s and are regularly published and available by electronic mail. The main value of this benchmark is that results are known for more computers than any other benchmark. Most of the compute time is contained in vectorisable DO-loops such as the DAXPY (scalar times vector plus vector) and inner product. Therefore one expects vector computers to perform well on this benchmark. The weakness of the benchmark is that it tests only a small number of vector operations, but it does include the effect of memory access and it is solving a complete (although small) real problem.