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Kernel ParameterDescriptionRecommended Value
semmnsThe maximum number semaphores in the system, and 16 bytes of kernel memory are allocated8192
semmniThe maximum number of semaphore sets can be set within 65535, and 84 bytes of kernel memory is allocated per set.5092
semmslThe maximum number of semaphores in a set of semaphores and must be logically equal to or less than semmns. If set too large, several semaphore IDs can monopolize the entire system semaphore.2000
semmapSemaphore space obtained by semget call5024
semmnuThe maximum number of undo structures in the system1024
semopmThe maximum number of operations processed by semi semop system call512
semumeThe maximum number of undo entries per process512
semvmxLimits the maximum value of one semaphore and does not specify a value greater than 3276732767

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