Gregory Stark <stark@xxxxxxxxxxxxxxxx> writes: > That's just a special case of what would be expected to happen with memory > allocation anyways though. Few allocators return memory to the OS anyways. Well, that does happen on Linux for instance. Since Matt knew in his original report that the xpath leak was intra-transaction, I assumed he must be using a platform where malloc/free can release memory back to the OS --- else he couldn't have seen that behavior from outside the backend. Still, it's entirely possible that some sort of high-water-mark is involved somewhere, perhaps in malloc's internal data structures. regards, tom lane
