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cluster:208 [2021/10/15 19:16] hmeij07 [Feedback] |
cluster:208 [2021/10/15 19:29] hmeij07 [Overview] |
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On the cpu resource requests: You may request 1 or more nodes, 1 or more sockets per node, 1 or more cores (physical) per socket or 1 or more threads (logical + physical) per core. Such a request can be fine grained or not; just request a node with '' | On the cpu resource requests: You may request 1 or more nodes, 1 or more sockets per node, 1 or more cores (physical) per socket or 1 or more threads (logical + physical) per core. Such a request can be fine grained or not; just request a node with '' | ||
- | //Note: this oversubscribing is not working yet. I can only get 4 simultaneous jobs running. Maybe there is a conflict with Openlava jobs. Should isolate a node and do further testing. After isolation (n37), 4 jobs with -n 4 exhausts number of physical cores. Is that why 5th job goes pending?// | + | //Note: this oversubscribing is not working yet. I can only get 4 simultaneous jobs running. Maybe there is a conflict with Openlava jobs. Should isolate a node and do further testing. After isolation (n37), 4 jobs with -n 4 exhausts number of physical cores. Is that why 5th job goes pending? |
===== MPI ===== | ===== MPI ===== | ||
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===== Changes ===== | ===== Changes ===== | ||
- | Suggestion was made to set Oversubcribe=No for all partitions (thanks, Colin). We now observe with a simple sleep script that we can run 16 jobs simultaneously (with either -n or -B). So that's 16 physical cores, each has a logical core for a total of 32. | + | Suggestion was made to set '' |
'' | '' | ||
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sleep 60 | sleep 60 | ||
</ | </ | ||
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**[[cluster: | **[[cluster: | ||