>If you simply skip the one node which seems to stall, does the run >work? For PBS, you might need to create a queue which skips this node, >or simply mark the node down using pbsnode. Thanks for the suggestion. I suspect that the nodes are working fine. And I am not too concerned with mpiBLAST compilation/setup, which has worked fine on this and other clusters. What really intrigues me is the error message that I posted previously: ---------------------------------------------------------------------------- Unknown message tag (-32766) received by 1 UUnknUkUnknknonwonwonwown nm nm nm mesessessesssagaegaegaege t at at atag g( g( g( (-3-23-23-232767667667666) )r )r )r reececeeceeceiivevievievedd b db db byy 2 y3 y4 5 ----------------------------------------------------------------------------- No typos - it appears exactly as shown above. It suggests to me an MPI problem, but my grasp of MPI internals is slim - I just wondered if anyone else has ever seen something similar and what it could mean. Neil -- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney 2052, Australia http://psychro.bioinformatics.unsw.edu.au/neil/index.php