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FFTW Poisson solver and tile geometry #93

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fjansson opened this issue Mar 5, 2024 · 0 comments

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fjansson commented Mar 5, 2024

The FFTW Poisson solver doesn't handle all tile geometries well. Problematic cases are

odd itot and/or jtot,
itot not divisible by nprocy
jtot not divisible by nprocx

Fixes proposed in 8f2c585 . @jiskattema and @v1kko could you have a look at them? There are some more details in the commit message. (@CasparJungbacker FYI)

Test case: BOMEX or RICO with the following grid settings

&RUN
...
nprocx     = 3
nprocy     = 2
/
&DOMAIN
itot       =  21  ! 3*7 
jtot       =  22  ! 2*11
kmax       =  97  ! prime
xsize      =  2100
ysize      =  2200

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