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1.7.5 Limits on Shared Memory Resources
Limits:
SHMMNI max num of shared segments system wide ... 4096.
SHMMAX max shared memory segment size (bytes) ... 4M
SHMMIN min shared memory segment size (bytes). 1 byte (though PAGE_SIZE is the effective minimum size).
SHMALL max shared mem system wide (in pages) ... policy.
SHMLBA segment low boundary address multiple. Must be page aligned. SHMLBA = PAGE_SIZE.
Unused or unimplemented:
SHMSEG : maximum number of shared segments per process.