vel 2 and Level 3  BLAS
rate of execution. The  recursive  algorithm  allows indeed to almost
achieve  Level 3 BLAS  performance  in the panel factorization.  On a
large  number of modern machines,  this  operation is however latency
bound,  meaning  that its cost can  be estimated  by only the latency
portion N0 * log_2(P) * lat.  Mono-directional links will double this
communication cost.

<H1>Arguments</H1>
<PRE>
PANEL   (local input/output)          HPL_T_panel *
        On entry,  PANEL  points to the 