Sommaire
General information
Domain & resolution
First you should decide upon the final(!) (see "Cascading" below) domain and resolution you want to run. For this it is important to know that:
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In general, the shorter the requested time the shorter the queued time. Therefore, you want to request as little time as possible for a job. However, runtimes on clusters of the Alliance can vary by a lot, normally between -15 % to + 20 % of the average runtime. Hence, one should request runtimes that are about 25 % larger than the average expected runtime.
If you only want to run one job you can just request "enough" runtime. But when you are running a simulation with a sequence of jobs you might want to try to fit the jobs at the higher end of a queue. For Assuming, there are the following queues on a cluster:
- 3 hours or less,
- 12 hours or less,
- 24 hours (1 day) or less,
- 72 hours (3 days) or less,
And the simulation you want to run usually needs 14 hours per job.