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|Oracle Solaris Tunable Parameters Reference Manual Oracle Solaris 10 1/13 Information Library|
Swapping in the Oracle Solaris OS is accomplished by the swapfs pseudo file system. The combination of space on swap devices and physical memory is treated as the pool of space available to support the system for maintaining backing store for anonymous memory. The system attempts to allocate space from disk devices first, and then uses physical memory as backing store. When swapfs is forced to use system memory for backing store, limits are enforced to ensure that the system does not deadlock because of excessive consumption by swapfs.
The smaller of 4 MB and 1/16th of physical memory
The minimum value is 4 MB or 1/16th of physical memory, whichever is smaller, expressed as pages using the page size returned by getpagesize.
The maximum value is the number of physical memory pages. The maximum value should be no more than 10 percent of physical memory. The system does not enforce this range, other than that described in the Validation section.
Generally not necessary. Only change when recommended by a software provider, or when system processes are terminating because of an inability to obtain swap space. A much better solution is to add physical memory or additional swap devices to the system.
Defines the desired amount of physical memory to be kept free for the rest of the system. Attempts to reserve memory for use as swap space by any process that causes the system's perception of available memory to fall below this value are rejected. Pages reserved in this manner can only be used for locked-down allocations by the kernel or by user-level processes.
The larger of 2 MB and 12.5% of physical memory
1 to amount of physical memory
Consider reducing this parameter value when processes are failing because of an inability to obtain swap space, yet the system has memory available. For example, change this value to use no more than 6.25% of system memory, but do not reduce it below 5% of system memory.
On SPARC systems, the value should be at least 2 times the value of tsb_alloc_hiwater_factor. For more information, see tsb_alloc_hiwater_factor.