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Typically computational cluster is fully loaded almost all the time and there is a difficulty in submitting small (1-2 min) testing jobs running on two nodes or even a single node.
There is some suggestion from bioteam.net whichis not very clear:
1. Same queue structure as before (see bioteam.net)
2. Attach “slots=2” as a host resource on all nodes
3. Submit test jobs to all queues
The wizard solution:
- qconf -aattr exechost complex_values slots=2 <host>
- What did we do?
- Slot limits “solve” the oversubscription problem
- Still have these problems:
- FIFO job execution
- Priority is handled by OS after SGE scheduling
- We can still do better (stay tuned)…
When threshold is exceeded, no new jobs are placed on host. Essentially it is the signal that the host is busy.
Can use iether built-in values or values reported by custom load sensors (example: ‘logged-in-users=5’). Default value
lead to oversubscription of computational tasks. In this case 0.75 is a better threshold.
For slot hacking you need tocreate a quwu with np_load_avg=3.00 or higher. Submission of a small test jobs from this queue will lead to immediate start as typical computation job produces average load 1.0.
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