What version of the Spine launcher are you using?
Spine Editor 3.8.84
(We are using it in production in our custom engine for several games, so I can't upgrade for 4 editor for now, sorry for mention old version on thread related to new version).
Also tried to version 3.8.99, same result
I tried several tricks for windows, but it' impossible to get more than 2Gb RAM -
-Xmx2024m is maximum available memory, if I try to get more, I get error like this:
Error occurred during initialization of VM
Could not reserve enough space for 2457600KB object heap
It's impossible to get more with command line key, I found that there is some trick with patching exe on windows to get 4Gb - http://www.translatetheweb.com/?from=&to=en&a=http://forall.ru-board.com/egor23/online/FAQ/Virtual_Memory/Limits_Virtual_Memory.html to get more memory, but Spine has self-protection, and I can't test it, so I want to try mac version.
I have several hundreds of skeletons, grouped to several separate projects with self-made algorithm, so total size of output texture guaranty less than 2048x2048 (I just check size of packed rectangles of non shared atlases, there are good enough heuristic to get 2048x(1000-1500) pixels of polygon packed shared atlases). It's pain to manual regroup those atlases, and problem to manual optimize of every skeleton, because of long time to check, if it will packed correctly or fail with memory error.
I use command line to import several skeletons to Spine Editor, and export it to make shared atlases, and it works for most atlases, but I have 1-2 atlases, that leads to java.lang.OutOfMemoryError: Java heap space. Those problem atlases has only several more skeletons than others (also, I reopen spine editor after import all skeletons, to avoid bug with no free memory mentioned here - Batch conversion), so I think, I need only some additional memory and want to try mac version for it, looks like it's possible to get more memory for 32-bit version (https://stackoverflow.com/questions/1434779/maximum-java-heap-size-of-a-32-bit-jvm-on-a-64-bit-os/1434901).
And looks like someone on this forum found a way to use more heap space for mac (Java Heap space when trying to export big texture: p58727), but I can't reproduce this solution, so I try to understand, if I doing it right.
P.S. Sorry for my English, it's not my native.