1. Basic Linear Algebra Communications Subprograms The BLACS project is an ongoing investigation whose purpose is to create a linear algebra oriented message passing interface that may be implemented efficiently and uniformly across a large range of distributed memory platforms. You can choose between an implementation based on MPI or PVM. This package uses MPI. There also exist implementations on HP Exemplar, IBM SP Series, Thinking Machines CM-5, SGI Origin 2000 and some Crays. From Debian 3.0r0 APT