* Roman Savochenko: > Initial condition of the problem representing is a program in the > single source code, built on-and for Debian 7, 8, 9, 10 with a result > in the Live disks.
I think glibc 2.13 as shipped by Debian was not built with --enable-experimental-malloc, so it doesn't use arenas. This can substantially decrease RSS usage compared to later versions. You can get similar behavior by setting the MALLOC_ARENA_MAX environment variable to 1 or 2. Debian 10 also adds a thread cache, which further increases RSS size. See the manual <https://www.gnu.org/software/libc/manual/html_node/Memory-Allocation-Tunables.html> for details how to change thread cache behavior. Thanks, Florian