Performance: Difference between revisions

Performance (view source)

229 bytes added , 29 November 2019

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 == Cluster ==
-If a cluster of computers is available that allow login - without asking for a password - by <code>ssh</code> and that have NFS-mounted the relevant directories under the same paths, one can use the [http://xds.mpimf-heidelberg.mpg.de/html_doc/xds_parameters.html#CLUSTER_NODES= CLUSTER_NODES=] keyword in XDS.INP.
+If a cluster of computers is available that allow login with <code>ssh</code> without asking for a password, and that have NFS-mounted the relevant directories under the same paths, one can use the [http://xds.mpimf-heidelberg.mpg.de/html_doc/xds_parameters.html#CLUSTER_NODES= CLUSTER_NODES=] keyword in XDS.INP. Attention: if <code>CLUSTER_NODES=a b c</code> then task 1 will run on node b, task 2 on node c, and task 3 on node a. This is due to the logic in the current (BUILT=20191015) version of <code>forkxds</code> (part of XDS package).
 If the other computers are not reachable by <code>ssh</code>, but coupled with a batch queueing system, then the forkxds script of the XDS distribution has to be modified: the node names are not relevant, and the <code>ssh</code> invocation has to be replaced by a <code>qsub</code> invocation - see [[Cluster Installation]].