Jeff,

Have you tried MPICH 3.0.4? Hydra has been improved a great deal since the 2.4 release.

As I wrote: We first tried the latest and greatest, i.e., MPICH 3.0.4. Only afterwards we tried MPICH2 1.5 to see whether previous versions behave the same. Unfortunately, both show the same behavior. The predecessor version MPICH2 1.4.1p1, however, works. Therefore we assume that some bug sneaked in between 1.4.1p1 and 1.5. Markus -- Dr. Markus Geimer Juelich Supercomputing Centre Institute for Advanced Simulation Forschungszentrum Juelich GmbH 52425 Juelich, Germany Phone: +49-2461-61-1773 Fax: +49-2461-61-6656 E-mail: [email protected] WWW: http://www.fz-juelich.de/jsc/ ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------