Hi Michael, perhaps the process is opening too many files for your OS. You could try running this in the terminal to raise the limit:
ulimit -S -n 50000
On Tue, May 12, 2026 at 1:08 PM Michael Barton <noreply@discourse.osgeo.org> wrote:
cmbarton
May 12I’m trying to create a rast3d map. I’ve done this before using the MODIS maps that some with the SC demo data. I’m now doing this with 12 monthly precipitation maps from a different locale. And I’m getting a weird error.
I’ve set the horizontal region to match the 1km resolution precipitation maps and the TB resolution to give me 12 layers.
g.region raster=CHELSA_pr_01_2021SP@PERMANENT format=plain
g.region -p -3 t=120000 b=0 tbres=10000 format=plain
I then try to create a rast3d map with the 12 monthly precipitation maps
r.to.rast3 input=CHELSA_pr_01_2021SP,CHELSA_pr_02_2021SP,CHELSA_pr_03_2021SP,CHELSA_pr_04_2021SP,CHELSA_pr_05_2021SP,CHELSA_pr_06_2021SP,CHELSA_pr_07_2021SP,CHELSA_pr_08_2021SP,CHELSA_pr_09_2021SP,CHELSA_pr_10_2021SP,CHELSA_pr_11_2021SP,CHELSA_pr_12_2021SP output=CHELSA_pr_2021SP_r3d --o
And I get this error. I’ve not seen this before. I have a LOT of RAM
Unable to open input file </Users/cmbarton/ASU Dropbox/C Michael Barton(ASU)/GRASS_dropbox/grassdata_dropbox/Brazil_SIRGAS2000_EPSG5880/PERMANENT/cell_misc/CHELSA_pr_12_2021SP/f_format>:
Too many open filesWhat am i missing here?
I’m using GRASS 8.5dev on a Mac ARM with 64Gb RAM
Michael
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