Lukas Lueg added the comment: The heuristic basically has to decide if memory pressure is so high that it's not save to return to the interpreter. Even if there is a chosen value (e.g. failed allocation attempts below 1mb are considered fatal), there can always be another OS-thread in the interpreter process that eats away exactly that memory while we are returning MemoryError - the program might still hang. FWICS all MemoryErrors are to be considered fatal or none of them
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