Adaptive time/space sharing with SCOJO

  • Authors:
  • Angela C. Sodan;Xuemin Huang

  • Affiliations:
  • School of Computer Science, University of Windsor, Ontario N9B 3P4, Canada.;School of Computer Science, University of Windsor, Ontario N9B 3P4, Canada

  • Venue:
  • International Journal of High Performance Computing and Networking
  • Year:
  • 2006

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Abstract

Time-shared execution of parallel jobs via gang scheduling is known to yield better average response times than space sharing. We incorporate adaptive CPU/node-resource allocation to consider varying system load and to reduce fragmentation. As main innovations, our SCOJO approach provides a clear model how to adapt, and considers realistic job mixes with moldable, malleable and rigid jobs. Our adaptive SCOJO significantly decreases response times and average slowdowns, while using a lower multiprogramming level than standard gang scheduling uses best and, therefore, decreasing the memory pressure. These benefits apply though the realistic job mixes limit the flexibility in resource allocation.