[MITgcm-support] Identifying location from processor & i,j

[Dafydd Stephenson]

Hi everyone,
all of my runs seem to eventually (after a few model decades) exit with the error “ STOP in CALC_R_STAR : too SMALL rStarFac[C,W,S] ! ”. I am running the ECCOv4r4 configuration with CORE Normal Year Forcing.

I have enabled monitoring at the timestep frequency, and, as the forcing repeats yearly, comparing the monitoring statistics with those of the previous year seems useful. Plotting them shows that they are comparable until the point of the error (at which point one of the line plots stops suddenly while the other continues), so I don’t believe there to be a CFL violation or any sort of runaway instability. Similarly, I have balanceEmPmR=.TRUE., so I don’t think that a cell is running dry.

Nevertheless, the error seems to occur in the same location every time (processor 94 of 192 [or 47 of 96, depending on the config], at i,j=2,13), and I think it would be useful to know exactly where this is. Is there some way I could get from this CPU,j,i location to an index of the llc90 grid?

Thanks in advance for any help,
Dafydd


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