Collect jemalloc stats
We should consider providing a mechanism that collects jemalloc statistics so that we can see how heap growth and fragmentation develop over time. This is not visible from the perspective of the Ruby VM or Ruby GC'ed heap.
jemalloc implements malloc_stats_print
for this: https://github.com/jemalloc/jemalloc/wiki/Getting-Started
It can generate a JSON report to stderr.
Edited by Matthias Käppler