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Cambridge Service for Data Driven Discovery

University of Cambridge

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QOS descriptions

QOS1 – highest quality of service

  1. QOS1 jobs have the highest priority and will move through the queue fastest.
  2. QOS1 jobs have a maximum job run time of 36 hours.
  3. QOS1 jobs have a maximum limit on the number of resource units that a single job can take:
    Peta4-Skylake jobs have a 1280 CPU core limit
    Peta4-KNL jobs have a 128 node limit
    Wilkes2-GPU jobs have a 64 GPU limit.
  4. The same limits apply, on each cluster separately, to QOS1 jobs overall belonging to the same user and project.

QOS2 – medium quality of service

  1. QOS2 jobs have a lower priority than QOS1 and will move through the queue slower than QOS1 jobs.
  2. QOS2 jobs have a maximum job run time of 12 hours.
  3. QOS2 jobs have a core maximum limit on the number of resource units that a single job can take:
    Peta4-Skylake jobs have a 320 CPU core limit
    Peta4-KNL jobs have a 64 node limit
    Wilkes2-GPU jobs have a 32 GPU limit.
  4. The same limits apply, on each cluster separately, to QOS2 jobs overall belonging to the same user and project.

QOS3 – lowest quality of service

  1. QOS3 jobs have the lowest priority and jobs will only run when there are no eligible QOS1 and QOS2 jobs in the queue.
  2. QOS3 jobs have a maximum job run time of 12 hours.
  3. QOS3 jobs have a low maximum limit on the number of resource units that a single job can take.
  4. The same limits apply, on each cluster separately, to QOS2 jobs overall belonging to the same user and project.