glibc differences between CentOS versions

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http://stackoverflow.com – CentOS seems to bundle a new version of glibc library RPM with every release. 6.0 has glibc-2.12-1.7.el6.x86_64.rpm 6.1 has glibc-2.12-1.25.el6.x86_64.rpm 6.2 has glibc-2.12-1.47.el6.x86_64.rpm 6.3 has glibc-2.12-1.80.el6_3.5.x86_64 What is the different between the glibc versions in each of these RPMs? I am specifically looking for the implementation of mallopt() function that allows us to configure the number of arenas used by malloc(). mallopt(M_ARENA_MAX, 1) has no effect in 6.0, 6.1 and 6.2, but it works in 6.3, even though all of the versions of CentOS seem to have the same version (HowTos)