Re: HPL low performance result.

The MPITB page is at http://atc.ugr.es/javier-bin/mpitb. You'll also find references to other work that uses MPITB there (http://atc.ugr.es/~javier/investigacion/papers/mpitb_octave_papers.html).  One of the papers listed there is by myself, and benchmarks the PEA similarly to what you have done.

Please note "Please, use the ICCS'06 conference paper below to cite MPITB for Octave. Thanks!" at the top of the MPITB papers page. You should definitely cite that paper - keeping projects like MPITB (and PelicanHPC) going requires continued funding, and citations help a lot.