SHMMAX and SHMALL

#define SHMMAX 0x2000000 /* max shared seg size (bytes) */
#define SHMMIN 1 /* min shared seg size (bytes) */
#define SHMMNI 4096 /* max num of segs system wide */
#define SHMALL (SHMMAX/getconf PAGE_SIZE *(SHMMNI/16))
#define SHMSEG SHMMNI /* max shared segs per process */

https://community.oracle.com/thread/2514518

http://dbasolutions.wikispaces.com/SHMMAX+and+SHMALL

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