Hi Uwe,
As luck would have it we were just looking at memory allocators again
and ran some quick RBD and RGW tests that stress memory allocation:
https://drive.google.com/uc?export=download&id=1VlWvEDSzaG7fE4tnYfxYtzeJ8mwx4DFg
The gist of it is that tcmalloc looks like it's doing pretty well
relative to the version of jemalloc and libc malloc tested (The jemalloc
version here is pretty old though). You are also correct that there
have been reports of crashes with jemalloc, potentially related to
rocksdb. Right now it looks like our decision to stick with tcmalloc is
still valid. I wouldn't suggest switching unless you can find evidence
that tcmalloc is behaving worse than the others (and please let me know
if you do!).
Thanks,
Mark
On 07/05/2018 08:08 AM, Uwe Sauter wrote:
Hi all,
is using jemalloc still recommended for Ceph?
There are multiple sites (e.g.
https://ceph.com/geen-categorie/the-ceph-and-tcmalloc-performance-story/) from
2015 where jemalloc
is praised for higher performance but I found a bug report that Bluestore
crashes when used with jemalloc.
Regards,
Uwe
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