[Pkg-matrix-maintainers] Bug#921425: matrix-synapse: please preload libjemalloc to reduce memory consumption

[Linda Lapinlampi]

I would be opposed to this, since there's no support for Valgrind since
jemalloc version 5.0.

As an example rationale: LibreSSL was forked from OpenSSL because of
OpenSSL's custom memory allocator and the OpenBSD project not catching
memory safety issues because of it. (It wasn't because of Heartbleed.) I
want to rely on libc's malloc(3) and would not appreciate an additional
dependency.

Smart ideas may not always be smart in the end. I think you'd be better
off convincing to switch the malloc(3) system call to use jemalloc(3)
everywhere, if the benefits are so good as claimed.

You can do you by adjusting the variables in your environment. Also,
your memory issues are probably from big rooms like #matrix:matrix.org
with lots of federating servers and 4.3K+ users; that's expected of
being there for a long time. For what it's worth, joining that room is
doable on a 512 MB virtual machine just fine with memory consumption
< 100 MB (at least for a hour or few with one user).

I also don't think this bug warrants "normal" severity; likely
"wishlist", maybe "minor".