How to prevent SGE from assigning more nodes than I actually want for my VASP calculations?

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hwang4 · #1 Post by **hwang4** » Fri Jun 09, 2006 2:06 am

Every node of our computer has 2 dual-core cpu, i.e., 1 node=4 cores. I am using SGE to submit my parallel jobs. If I specify #$ -pe mpi 8 in my script, I am requesting 8 cores. But I don't have controlled on getting 2 nodes only. When some nodes are partially taken by some serial jobs of others, SGE will assign 3 nodes for my job, which greatly reduces the speed of the calculations. So I wonder whether SGE has some parameter to specify exactly how many nodes I want to use instead of cores? Thanks a lot

job · #2 Post by **job** » Fri Jun 09, 2006 8:17 am

Ask your system admin to create a parallel environment with

allocation_rule 4

instead of the usual

allocation_rule $fill_up

hwang4 · #3 Post by **hwang4** » Fri Jun 09, 2006 2:18 pm

Thanks a lot!