I have the program which uses BDB and while testing often makes
spawn. And after 12 hours of testing bdb said:
mmap: Cannot allocate memory
But the problem that I've found that it is not BDB created too
many maps. Watching for /proc/[PID]/maps shows that number of
anonymous mapped regions increases on 2 every spawn process, and
never decreases even after finishing the spawned thread.
According to logs my program made 32543 spawns for test time. And
my /proc/sys/vm/max_map_count = 65530. So only 444 maps was
allocated by other reasons and 65086 by spawn.
So what to do? How to make spawn decrease count of anonymous