[MITgcm-support] Reducing Runtime for High Resolution Model

[Nadav Mantel]

Hi Dimitris,[image: ltp|17409063968802496]

Thanks for the reply.

Yes, below is the SIZE.h file:

     &           sNx =   139,

     &           sNy =   283,

     &           OLx =   3,

     &           OLy =   3,

     &           nSx =   1,

     &           nSy =   1,

     &           nPx =   4,

     &           nPy =   12,

     &           Nx  = sNx*nSx*nPx,

     &           Ny  = sNy*nSy*nPy,

     &           Nr  =  32)


We split it into 48 processes. Any suggestions?


Thanks

On Mon, Mar 3, 2025 at 3:54 AM Dimitris Menemenlis <dmenemenlis at gmail.com>
wrote:

> I am assuming that you already have done the obvious of splitting your
> 556x3396 domain into smaller tiles and increased the number of processes
> that you are using so as to reduce computational load per process?
>
> On Feb 25, 2025, at 5:11 AM, Nadav Mantel <nadav.mantel at mail.huji.ac.il>
> wrote:
>
> I am attempting to run a high-resolution model of the Gulf of Aqaba. We
> are attempting to simluate a desalination plant's long term effects, but
> the addmass on a coarse grid doesn't simulate the salt plume as a singular
> point increases the salinity of a cell only slightly. Therefore, we
> increased the horizontal grid resolution to 60x60 meters, with 32 depth
> levels with depths ranging from 5 meters to 255 meters.  Due to the high
> resolution, the CFL requires a maximum timestep of 30 sec before the model
> crashes. We want to run a hydrostatic simulation for two years which will
> result in a very long simulation.
>
> Does anyone have any tips on how to reduce runtime? We tried to increase
> the timestep by changing the A4 and Ah max values and also use useFullLeith
> but they didn't really help.
>
>  delX   = 556*60,
>
>  delY   = 3396*60,
>
>
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