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diff --git a/doc/documentation.tex b/doc/documentation.tex index 4f9abac..53aed8d 100644 --- a/doc/documentation.tex +++ b/doc/documentation.tex @@ -166,6 +166,15 @@ the partition parameters) will apply the automatic distribution. That's why it is not necessary to set \verb|PUGH::partition_3d_y = "30"| or \verb|PUGH::partition_3d_z = "15 15"| in the parameter file. +Because the previous automatic distribution gave problems in some +cases (e.g.\ very long box in one, but short in other directions), +there is now an improved algorithm that tries to do a better job in +decomposing the grid evenly to the processors. However, it can fail +in certain situations, in which it is gracefully falling back to the +previous (\verb|"automatic_old"|) giving a warning. Note that, if one +or more of the parameters \verb|PUGH::processor_topology_3d_*| or +\verb|PUGH::partition_3d_*| are set, this mode automatically falls back to +\verb|"automatic_old"| without warning. \section{Understanding PUGH Output} |