As I understand it and you, this kind of specialized technical question is usually not a good fit to this list about general issues in R programming, though someone may respond here of course. Alternatively, you may find it useful to post on one (or some?) of the R SIGS (Special Interest Groups) listed at https://www.r-project.org/mail.html to see if one of them might be a better fit. (Though some listed there may be inactive). Note also that some R packages dealing with image processing have their own dedicated lists.
Happy hunting. Cheers, Bert On Thu, Sep 4, 2025 at 2:17 PM Steve Rowley via R-help <r-help@r-project.org> wrote: > I have a question about repeated image processing and recovering memory via > garbage collection. > > A couple images are displayed simultaneously for analysis, using > split.screen(). I'm looping over a large collection of images, using > jpeg/readJPEG(), png/readPNG(), and caTools/read.gif() to load an image > into memory from a file. Then I use erase.screen() to erase the previous > image, use plot() to set up a plotting area, and display the image with > rasterImage(). Then the user elects some processing, and we move on to the > next image(s). > > I'm very carefully not holding references to any of the previous images. > GC is indeed happening, but memory quickly fills up. It certainly *looks* > as though the image memory is not being released: printing out trace info > using mem_used()[[1]] says memory use increases with each image, by about > the image size. Forcing periodic GC's, measuring memory used before and > after, shows that no memory is recovered. > > Some questions: > > (1) Is it known that processing images in this way will lead to allocating > memory that is not recovered by GC? > > (2) Are there any tools you'd recommend to see exactly *what* is filling up > memory, just in case it's not previous images, but some other problem? > > This is R 4.4.2 (for now). Running MacOS on an ARM processor. > ___________ > Steve Rowley <s...@alum.mit.edu> Zoom: 839 529 4589 > <https://us04web.zoom.us/j/8395294589?pwd=dlQ4MUFHK1NFOCtoZFpUNFRtZ2lSQT09 > > > It is very dark & after 2000. If you continue, you are likely to be eaten > by a bleen. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > https://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide https://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
