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Faster access for testing and debugging
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A trick that may give you faster access when performing small test runs in the queuing system.
Removing the parameter "ib" (if present) from the following line in you job script
#PBS -lnodes=2:ppn=8:ib (Remove ":ib")
will most probably make your test jobs start immediately, since it is most likely that some of the "non Infiniband nodes" are available. If your program has a demanding communication pattern, this will of course slow down your program.
The "ib" option above tells the system that this job needs to use the Infiniband interconnect. If ":ib" is omitted, the job may either run on the Infiniband interconnect or the Gigabit Ethernet, but you don't know in advance. If your application doesn't need Infiniband you should omit this option, to avoid being stuck in the queuing system waiting for Infiniband powered nodes becoming available.
