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Strange because in my all my experiments calling malloc.trim always helped - memory reported by top decreased to the level it supposed to be. Do you have in mind case when calling malloc.trim won't do anything? Also shouldn't MALLOC_TRIM_THRESHOLD_ env variable has impact on malloc.trim calls? At the moment seems any value is ignored... 12 ???. 2017 ?. 6:09 ?? ???????????? "Simon

...emacs, Xorg and opera. I tried the same experiment on my system with emacs, Xorg and firefox and didn't see what that post saw -- maybe 1 few percent recovery. At this point I'm not sure we have enough data to show that adding malloc_trim calls at the end of each GC, say, would warrant the nusance of having to add configure checks. It would also be necessary to make sure that adding this doesn't significantly ompact malloc performance. I don't know if this issue exists on Windows as well; it might as the basic malloc we use there is the same as used in glibc (Dog Lea's malloc)....