Enabling Contiguous Node Scheduling on the Cray XT3
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Electrical Fan
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09-12-2009, 01:50 PM



.pdf   Enabling Contiguous Node Scheduling on the Cray XT3.pdf (Size: 2.43 MB / Downloads: 51)
Abstract:
A flexible job scheduling environment to enable jobs to be placed onto its Cray XT3 system in ways that can help them achieve better performance, work on a graphical machine monitor to help visualize jobs placed on the system, and node assignment changes to help minimize communication overhead to all jobs. system changes that have been made to enable them will be discussed Xt3dmon has been developed that features several views of the machine including both physical and wired (logical) ones using node attribute information from the processor table of the XTAdmin database within the System Database (SDB). a physical view from Xt3dmon of the machine in two rows with nodes grouped by cabinet, cage and module. a wired view of the machine which helps to visualize the interconnect topology. In both the physical and wired views nodes may be color coded to display the location of jobs within the system. Using both views, this tool has helped to visualize the proximity of nodes assigned to jobs. Xt3dmon has been an important tool in helping to understand both the node connections and node selections from node allocation algorithms.
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