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LCKMGR_MODE is a system parameter that controls use of the Dedicated CPU Lock Manager on Alpha and Integrity servers. Setting LCKMGR_MODE to a number greater than zero (0) indicates the number of CPUs that must be active before the Dedicated CPU Lock Manager is turned on.

The Dedicated CPU Lock Manager performs all locking operations on a single dedicated CPU. This can improve system performance on large SMP systems with high MP_Synch associated with the lock manager.

If the number of active CPUs is greater than or equal to LCKMGR_MODE, a LCKMGR_SERVER process is created to service locking operations. This process runs at a real-time priority of 63 and is always current.