Difference between revisions of "WRF performance"

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In the legend, "T" indicates the number of threads (OpenMP).
 
In the legend, "T" indicates the number of threads (OpenMP).
  
One can see for this configuration, the best option is to run with 480 processors, 2 OpenMP threads and 1 I/O group with 2 tasks. This gives the best walltime at one of the lowest cost in SU. Unfortunately, it seems simulations with I/O quilting aren't very stable (this doesn't show in those short tests) so please choose the configuration you think is best for you.
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One can see for this configuration, the best option is to run with 432 processors, 2 OpenMP threads and 1 I/O group with 2 tasks. This gives the best walltime at one of the lowest cost in SU. Unfortunately, it seems simulations with I/O quilting aren't very stable (this doesn't show in those short tests) so please choose the configuration you think is best for you.
  
 
[[File:WRF scaling v4.1.3.png|1000px|center]]
 
[[File:WRF scaling v4.1.3.png|1000px|center]]

Revision as of 20:15, 17 December 2019

Configuration

We tested the performance of WRF with the CORDEX domain with a nest over NSW, NARCliM project setup.

It is possible to look at WRF performance with other domains as long as those are used by a group of people and are used over a significant period of time if possible. Please contact cws_help@nci.org.au to discuss the possibility.

The configuration tested can be found at /g/data/sx70/wrf-scaling.

Results

Below is a chart showing the walltime (WT) and the SU cost per model day for different number of processors, threads and I/O quilting options.

The chart shows the data for Gadi and some for Raijin as a comparison.

In the legend, "T" indicates the number of threads (OpenMP).

One can see for this configuration, the best option is to run with 432 processors, 2 OpenMP threads and 1 I/O group with 2 tasks. This gives the best walltime at one of the lowest cost in SU. Unfortunately, it seems simulations with I/O quilting aren't very stable (this doesn't show in those short tests) so please choose the configuration you think is best for you.

WRF scaling v4.1.3.png