I've never used the profiler you're using.
I would think if you're in vmem_hash_delete from there, you must be in
the umem implementation of it.

Are you sure it's burning cycles?  The way I'm reading the output
makes it appear almost negligible.

Do you have data from a profiler you _do_ trust?  Given the doubt that
the one you're using "is working correctly".

Are you using umem normally, or do you have any of the debugging
features enabled?
Are you making allocations that would bypass the quantum cache?
(large, I think memalign'd but am not sure, etc.), and would thus send
us legitimately down this path even if it _is_ a hog.

-- Rich


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