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WRF-Chem Version 4.4 Performance and RSL File Size Optimization


New member
Hello Everyone,

I hope this email finds you well. I am reaching out regarding some performance and file size issues we are encountering with our WRF-Chem version 4.4 simulations.

1) Performance Improvement:
I have observed that our simulations are running significantly slower than expected, particularly when dealing with nested domains. For instance, it currently takes around 2 hours to write one hour of wrfout output. This is posing challenges as we aim to run simulations spanning over one month. We are keen on exploring any possible optimizations or best practices to enhance the performance of our WRF-Chem runs. Are there any specific configurations, compiler options, or runtime settings that we could adjust to expedite the simulation process?

#SBATCH -p defq
#SBATCH -J wrf_chem_opt_10_D02_GFS
#SBATCH -o main_02.out
#SBATCH --mail-user
#SBATCH --mail-type=ALL
#SBATCH -n 50

2) RSL File Size Optimization:
Additionally, I have noticed that the size of our rsl.out.0000 file is unmanageably large, approximately 250 GB. We suspect that WRF-Chem might be overwriting this file at every step, leading to its substantial growth. Could you please provide guidance on how we can mitigate this issue? Are there any settings or strategies we can employ to limit the size of these diagnostic files without compromising the essential information they provide?

For your reference, I have attached the relevant namelist file.

Thank you for your time and assistance. We look forward to your prompt response.

Best regards,


  • namelist (7).input
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