glibc

Will malloc implementations return free-ed memory back to the system?

The following analysis applies only to glibc (based on the ptmalloc2 algorithm). There are certain options that seem helpful to return the freed memory back to the system: mallopt() (defined in malloc.h) does provide an option to set the trim threshold value using one of the parameter option M_TRIM_THRESHOLD, this indicates the minimum amount of … Read more

Multiple glibc libraries on a single host

It is very possible to have multiple versions of glibc on the same system (we do that every day). However, you need to know that glibc consists of many pieces (200+ shared libraries) which all must match. One of the pieces is ld-linux.so.2, and it must match libc.so.6, or you’ll see the errors you are … Read more