Good day, I would like to understand how GRASS loads raster images into memory to perform calculations on them. Does it load the entire image into memory and only then do the calculation on them, or it loads image into memory by portions sequentially? Or may be this depends on specific module? In particular I am interested in 2 modules: *r.mapcalc* and *r.patch*.
In my experiments I had strong feeling that it loads image into memory by portions, because the usage of memory during the calculation was not big but the HDD I/O was continuous and quite aggressive... Any answer or links to documentation about this issue can help me a lot. Thanks in advance!
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