[CentOS] Why the huge shmmax default setting?
lists at benjamindsmith.com
Wed Dec 18 00:33:16 UTC 2013
Fresh load of Centos6/64 from new ISO (downloaded 2 weeks ago?) and
getting set up with PostgreSQL, one of the typical steps is to increase
shmmax from its normal, conservative value (eg: 32 MB or something) to
something far more aggressive.
But in recent installs of CentOS 6, this value is generally huge,
typically larger than the RAM installed on the machine! For example,
fresh installs on systems with 32 GB of RAM, this is already set to
68719476736 (64 GB)
This large value doesn't really make sense to me - can somebody explain
why the change to such a large value?
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