weird iteration number in mod.nc file

[leon]

Hi all,

I'm using 4DVAR to run a test case. The total iteration number seems odd to me in the output mod.nc file. My understanding is that the total iteration equals Ninner * Nouter. However, the output iteration in mod.nc is larger that Ninner*Nouter.

In my case,

Code: Select all

Ninner = 7 ;
Minner = 8 ;
Nouter = 3 ;
Mouter = 4 ;
three = 3 ;
iteration = UNLIMITED ; // (25 currently)

I'm confused here. Any idea why iteration=25? Shouldn't it be 21? Many thanks!