[R-sig-Geo] strange issue of memory converting a raster to a data frame

[Sebastiano Trevisani]

Hi  Loïc,

thank you for your suggestion! this was one of the possibilities I checked.
However, I tried with terra.options() to change the memfrac parameter from
0.6 to 0.1, so as to force the writing on disc, but things didn't work.
It seems like it is working as 32 bit system, but the R the installation
seems right to 64. Probably I'm missing something very obvious.
I will try to build a reproducible example without the need to upload all
the file.

Thanks again,

Sebastiano

*      Sebastiano Trevisani, Ph.D.*
*            Associate Professor*
*Applied and Environmental Geology*


*  https://orcid.org/0000-0001-8436-7798
<https://orcid.org/0000-0001-8436-7798>*
*IUAV University of Venice: www.iuav.it <http://www.iuav.it/>*

*Address: Dorsoduro 2206,  Venice 30123, Italy Tel:    +39. 041. 257
1299Mail:    strevisani using iuav.it <strevisani using iuav.it> *
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*"The views expressed are purely those of the writer and may not in
any circumstances be regarded as stating an official position of the IUAV."*


On Mon, Jan 23, 2023 at 5:36 PM DUTRIEUX Loic <Loic.DUTRIEUX using ec.europa.eu>
wrote:

> Hi Sebastiano,
>
> Try comparing terra::terraOptions() and terra::mem_info(r) on both
> systems. Just guessing there but it could be that terra is trying to do
> everything in memory and failing on your 16GB system, while taking a memory
> friendly route on your 8GB system.
>
> Cheers,
> Loïc
> ________________________________________
> From: R-sig-Geo <r-sig-geo-bounces using r-project.org> on behalf of Sebastiano
> Trevisani <strevisani using iuav.it>
> Sent: 23 January 2023 12:30:14
> To: r-sig-geo
> Subject: [R-sig-Geo] strange issue of memory converting a raster to a data
> frame
>
> Dear list members,
>
> In converting a raster as the one below to a data frame, I have an issue of
> memory allocation only when I use a specific pc, and in particular the one
> with more memory. To be more precise (using same version of R 4.2.2 and
> Terra terra 1.6.47, by means of as.data.frame() function):
>
> with a I5 processor with 8Gb of memory, windows 10 it works
>
> with a I7 processor with 16gb of memory, windows 11 it doesn't
>
> I'm not able to figure out a possible explanation!
> Any suggestions on what to check?
>
>
> SpatRaster
> dimensions  : 5000, 5000, 18  (nrow, ncol, nlyr)
> resolution  : 30, 30  (x, y)
> extent      : -8526.878, 141473.1, 4110588, 4260588  (xmin, xmax, ymin,
> ymax)
> coord. ref. : WGS 84 / UTM zone 45N (EPSG:32645)
> source      : multyMadRes2c.tif
>
>
>
> Sebastiano
>
> *      Sebastiano Trevisani, Ph.D.*
> *            Associate Professor*
> *Applied and Environmental Geology*
>
>
> *
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> *"Le opinioni espresse sono riferibili esclusivamente all'autore e non *
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> *"The views expressed are purely those of the writer and may not in
> any circumstances be regarded as stating an official position of the
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