How do I restrict or modify size of /dev/shm?

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If an application is POSIX compliant or it uses GLIBC (2.2 and above) on a Red Hat Enterprise Linux system, it will usually use the /dev/shm for shared memory (shm_open, shm_unlink). /dev/shm is a temporary filesystem (tmpfs) which is mounted from /etc/fstab. Hence the standard options like "size" supported for tmpfs can be used to increase or dec...

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