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Running WRF with mpiexec

I

ikki0123

New member
Hello, my question is the following. If I run WRF with MPI and other nodes (Cluster ) is the execution time shorter? I did a test and it seems to me that I didn't see any difference in execution time. I don't know if I did something wrong. My test was as follows
First I used a node with 8 cores, then I tested it with another node totaling 16 cores, but I didn't notice any difference in the execution time.
I am using mpiexec
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forum.mmm.ucar.edu

Is RAM bus speed still a bottleneck

I am buying a new computer to replace the one I have been using to run WRF for the past few years. I'm going to get the intel i9 12900 cpu which has 16 cores and 24 threads. I am still deciding if I should buy cheaper ddr4 memory with bus speed of 3600 MHz or ddr5 ram with higher bus speed. I've...
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forum.mmm.ucar.edu

I am interested in buying a new computer and want to know the necessary requirements for building WRF on my machine

There are a number of components to the WRF modeling system. The pre-processors in the WPS package tend to not use much memory unless the domain has a large number of grid cells in each direction. Even for a 1000x1000 domain, we usually find that the geogrid and metgrid programs are able to run...
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ikki0123 said:
Hello, my question is the following. If I run WRF with MPI and other nodes (Cluster ) is the execution time shorter? I did a test and it seems to me that I didn't see any difference in execution time. I don't know if I did something wrong. My test was as follows
First I used a node with 8 cores, then I tested it with another node totaling 16 cores, but I didn't notice any difference in the execution time.
I am using mpiexec
View attachment 8037
Click to expand...
 
@ikki0123
It doesn't look like you're actually using multiple processors. I'm not sure what is going on, but those messages should look more like (for e.g., if you are using 8 processors):
starting wrf task 0 of 8
starting wrf task 1 of 8
starting wrf task 2 of 8
starting wrf task 3 of 8
starting wrf task 4 of 8
starting wrf task 5 of 8
starting wrf task 6 of 8
starting wrf task 7 of 8

You may need to discuss this with a systems administrator at your institution to see if they can help you get it set up correctly.
 
kwerner said:
@ikki0123
It doesn't look like you're actually using multiple processors. I'm not sure what is going on, but those messages should look more like (for e.g., if you are using 8 processors):
starting wrf task 0 of 8
starting wrf task 1 of 8
starting wrf task 2 of 8
starting wrf task 3 of 8
starting wrf task 4 of 8
starting wrf task 5 of 8
starting wrf task 6 of 8
starting wrf task 7 of 8

You may need to discuss this with a systems administrator at your institution to see if they can help you get it set up correctly.
Click to expand...
I also found it strange, Apparently I'm running the same process several times. Thanks for the note, I'll take another look. Any news come back here.
 
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