I'm trying to solve some memory leaks, and I'm using jemalloc to dump heap profiles:
MALLOC_CONF=prof:true,lg_prof_interval:30,lg_prof_sample:17
Works as charm, but I don't know what I'm looking at :)
Does jemaloc heap profiling show all (sampled) allocations, or just the ones that haven't been free()-ed at the moment of taking a dump? Or to put it differently: is it an allocation profile, or "live" blocks profile?
My understanding is by default, jeprof shows allocations that are "live" at the time the dump is written. You can change that however.
See the jeprofile prof_accum option if you want to record all allocations: http://jemalloc.net/jemalloc.3.html#opt.prof_accum
You may also need the --alloc_space jeprof flag to display allocated bytes instead of the in use ones: https://github.com/jemalloc/jemalloc/blob/dev/bin/jeprof.in#L208