Difference between revisions of "BwUniCluster2.0/FAQ - broadwell partition"
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− | FAQs concerning best practice of bwUniCluster broadwell (aka "extension" |
+ | FAQs concerning best practice of [[BwUniCluster_2.0_Hardware_and_Architecture#Components_of_bwUniCluster|bwUniCluster broadwell partition]] (aka "extension" partition). |
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== Are there separate login nodes for the bwUniCluster broadwell partition? == |
== Are there separate login nodes for the bwUniCluster broadwell partition? == |
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* Yes, but primarily to be used for compiling code. |
* Yes, but primarily to be used for compiling code. |
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+ | |||
− | * You can directly login on broadwell partition using |
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+ | == How to login to broadwell login nodes? == |
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− | $ username@uc1e.scc.kit.edu |
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+ | * You can directly login on broadwell partition login nodes using |
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− | * If you login uc1, even though you can use broadwell nodes using the same procedure as 'compute nodes'. The submitted job will be distributed on broadwell nodes also. |
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+ | <pre> |
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− | example: msub -q singlenode |
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+ | $ ssh username@uc1e.scc.kit.edu |
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− | msub -q multinode |
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+ | </pre> |
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− | * But for the compilation you have to use the appropriate flags |
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+ | * If you are compiling code on broadwell login nodes, your code will not optimally run on the new "Cascade Lake" nodes. |
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+ | <br> |
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= Compilation = |
= Compilation = |
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+ | == How to compile code on broadwell (extension) nodes? == |
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− | == Q1 == |
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+ | To use the code only on the partition multiple_e: |
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+ | <pre> |
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+ | $ icc/ifort -xHost [-further_options] |
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+ | </pre> |
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+ | == How to compile code to be used on ALL partitions? == |
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+ | On uc1e (= extension) login nodes: |
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+ | <pre> |
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+ | $ icc/ifort -xCORE-AVX2 -axCORE-AVX512 [-further_options] |
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+ | </pre> |
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+ | <br> |
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= Job execution = |
= Job execution = |
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+ | == How to submit jobs to the broadwell (= extension) partition == |
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− | == Q2 == |
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+ | The submitted job will be distributed either way to the broadwell nodes if specified correctly, i.e.: |
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+ | <pre> |
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+ | $ sbatch -p multiple_e |
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+ | </pre> |
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+ | |||
+ | == Can I use my old multinode job script for the new broadwell partition? == |
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+ | Yes, but please note that all broadwell nodes do have '''28 cores per node'''. |
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Latest revision as of 22:29, 7 October 2022
FAQs concerning best practice of bwUniCluster broadwell partition (aka "extension" partition).
Contents
1 Login
1.1 Are there separate login nodes for the bwUniCluster broadwell partition?
- Yes, but primarily to be used for compiling code.
1.2 How to login to broadwell login nodes?
- You can directly login on broadwell partition login nodes using
$ ssh username@uc1e.scc.kit.edu
- If you are compiling code on broadwell login nodes, your code will not optimally run on the new "Cascade Lake" nodes.
2 Compilation
2.1 How to compile code on broadwell (extension) nodes?
To use the code only on the partition multiple_e:
$ icc/ifort -xHost [-further_options]
2.2 How to compile code to be used on ALL partitions?
On uc1e (= extension) login nodes:
$ icc/ifort -xCORE-AVX2 -axCORE-AVX512 [-further_options]
3 Job execution
3.1 How to submit jobs to the broadwell (= extension) partition
The submitted job will be distributed either way to the broadwell nodes if specified correctly, i.e.:
$ sbatch -p multiple_e
3.2 Can I use my old multinode job script for the new broadwell partition?
Yes, but please note that all broadwell nodes do have 28 cores per node.