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On my CentOS 6.2 server the value of ulimit -v (virtual memory) is 1048576. However, this is not set in /etc/security/limits.conf (which is empty) or .../limit.d/ (which contains only a max processes setting).

How can I find the source of this value? Is it the default, maybe? (Doesn't appear to be so, since on an unrelated CentOS server I know it's unlimited)

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The default is unlimited. It is possible to lower ulimits values as an unprivileged account though, so you might want to take a look in /etc/profile, /etc/profile.d and / or your personal shell configuration files.

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