> -----Original Message----- > From: Arnau Bria [mailto:[email protected]] > Sent: Wednesday, 4 March 2009 2:21 AM > To: [email protected] > Subject: [Mauiusers] DEDICATEDPS vs DEDICATEDPES > > Hi all, > > Could someone help me to undestand teh diff bewteen DEDICATEDPES and > DEDICATEDDPS? > processor-equivalent second means normalized cpu time? > > TIA, > Arnau
Hi Arnau, PE is a measure of how many processors a job is preventing others from accessing. Lets say you have a cluster of dual socket, 4 core machines with 16GB per node. A job that requests 1 core and 8GB of memory is effectively using half of a node (if we expect most/average jobs to request about 2GB of memory per core requested) so has a PE count of 4. A job that requests 16GB is effectively stopping any other jobs from running on a node so PE=8 The concept breaks down on a system which doesn't have highly uniform nodes. >From >http://www.clusterresources.com/products/maui/docs/5.1.2priorityfactors.shtml : The final resource component, PE, represents 'Processor Equivalents'. This component can be viewed as a processor-weighted maximum 'percentage of total resources' factor. For example, if a job requested 25% of the processors and 50% of the total memory on a 128 processor O2K system, it would have a PE value of MAX(25,50) * 128, or 64. The concept of PE's may be a little awkward to grasp initially but it is a highly effective metric in shared resource systems. -- Gareth _______________________________________________ mauiusers mailing list [email protected] http://www.supercluster.org/mailman/listinfo/mauiusers
