[RegCNET] CFL Violation Detected

[Khandu Khandu]

Dear Users,

I am very new super computing system and has encountered some problems
running the RegCM4.4 in the cray machine. The basic tests was run on a
interactive mode by allocating some nodes and ran successfully for the
default European domain but the same job fails when run by submitting the
job. Specifically, the error message was:

 SRF variables written at 1990-06-03 09:00:00 UTC
 $$$ 1990-06-03 12:00:00 UTC, ktau   =             1440
 $$$ 1st, 2nd time deriv of ps   =  0.61801E-05 0.14347E-07
 $$$  no. of points w/convection =     947
 SEARCH BC data for   1990060318
 READY  BC from       1990060312  to   1990060318
 ATM variables written at 1990-06-03 12:00:00 UTC
 SRF variables written at 1990-06-03 12:00:00 UTC
 RAD variables written at 1990-06-03 12:00:00 UTC
 WHUUUUBBBASAAAGASDDWD!!!!!!!!!!!!!!!!
 WHUUUUBBBASAAAGASDDWD!!!!!!!!!!!!!!!!
 WHUUUUBBBASAAAGASDDWD!!!!!!!!!!!!!!!!
 No more atmosphere here....
 No more atmosphere here....
 CFL violation detected, so model STOP
 CFL violation detected, so model STOP
 #####################################
 #####################################
 #            DECREASE DT !!!!       #
 #            DECREASE DT !!!!       #
 #####################################

The job script is given below:

a. For the interactive mode - by allocating the mode
          salloc --ntasks=32 (e.g. only)
           aprun -n 32 ./bin/regcmMPI_clm45 regcm.in >regcm.out
b. job script - run as sbatch regcm.sbatch
========================================================
#!/bin/bash -l
#SBATCH --job-name=test_001
#SBATCH --account=director865
#SBATCH --partition=workq
#SBATCH --time=12:00:00
#SBATCH --ntasks=8
#SBATCH --ntasks-per-node=4
#SBATCH --cpus-per-task=1
#SBATCH --export=NONE
module load intel
module load cray-netcdf
./bin/terrain test_001.in >> test_001.out
./bin/clm2rcm test_001.in >test_001.out
./bin/mksurfdata test_001.in >test_001.out
./bin/sst test_001.in >test_001.out
aprun -B ./bin/icbc test_001.in >test_001.out
aprun -B ./bin/regcmMPI_clm45 test_001.in >test_001.out
===========================================================

More information on the supercomputer can be found on:
https://portal.ivec.org/docs/Supercomputers/SLURM

I m doing some benchmarking tests on this machine which is pretty much
running out of time. So I would like to request your help at the earliest.

Thanking you.


Khandu

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