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Niagara Quickstart: Difference between revisions
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== Scheduling by node == <!--T:79--> | == Scheduling by node == <!--T:79--> | ||
On many systems that use SLURM, the scheduler will deduce from the specifications of the number of tasks and the number of cpus-per-node what resources should be allocated. On Niagara things are a bit different. | |||
<!--T:80--> | <!--T:80--> | ||
<ul> | <ul> | ||
<li><p>All job resource requests on Niagara are scheduled as a multiple of '''nodes'''.</p></li> | <li><p>All job resource requests on Niagara are scheduled as a multiple of '''nodes'''.</p></li> | ||
<li>The nodes that your jobs run on are exclusively yours. | <li>The nodes that your jobs run on are exclusively yours, for as long as the job is running on them. | ||
<ul> | <ul> | ||
<li>No other users are running anything on them.</li> | <li>No other users are running anything on them.</li> | ||
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</li> | </li> | ||
<li><p>Whatever your requests to the scheduler, it will always be translated into a multiple of nodes allocated to your job.</p></li> | <li><p>Whatever your requests to the scheduler, it will always be translated into a multiple of nodes allocated to your job.</p></li> | ||
<li><p>Memory requests to the scheduler are of no use. Your job always gets N x 202GB of RAM, where N is the number of nodes.</p></li> | <li><p>Memory requests to the scheduler are of no use. Your job always gets N x 202GB of RAM, where N is the number of nodes and 202GB is the amount of memory on the node.</p></li> | ||
<li><p> | <li><p>If you run serial jobs you must still use all 40 cores on the node. Visit the [[Running_Serial_Jobs_on_Niagara | serial jobs]] page for examples of how to do this.</p></li> | ||
<li><p>Since there are 40 cores per node, your job should use N x 40 cores. If you do not, we will contact you to help you optimize your workflow. Or you can [mailto:support@scinet.utoronto.ca contact us] to get assistance.</p></li></ul> | |||
== Hyperthreading: Logical CPUs vs. cores == <!--T:81--> | == Hyperthreading: Logical CPUs vs. cores == <!--T:81--> | ||