Number of pages reserved for the exclusive use of the pageout or scheduler threads. When available memory is less than this value, non-blocking allocations are denied for any processes other than pageout or the scheduler. Pageout needs to have a small pool of memory for its use so it can allocate the data structures necessary to do the I/O for writing a page to its backing store. This variable was introduced in the Solaris 2.6 release to ensure that the system would be able to perform a pageout operation in the face of the most severe memory shortage.

Unsigned integer

throttlefree / 2

The minimum value is 64 Kbytes or 1/512th of physical memory, whichever is greater, expressed as pages using the page size returned by getpagesize(3C).

The maximum is the number of physical memory pages. The maximum value should be no more than 2% of physical memory. The system does no enforcement of this range other than that described in the Validation section.

Pages

Yes, unless dynamic reconfiguration operations that add or delete memory occur. At that point, the value is reset to whatever was provided in the /etc/system file or was calculated from the new physical memory value.

If pageout_reserve is greater than throttlefree / 2, pageout_reserve is set to throttlefree / 2. No message is displayed.

The relationship of lotsfree is greater than desfree, which is greater than minfree, should be maintained at all times.

The default value is generally adequate. For systems with relatively static workloads and large amounts of memory, adjust this value downwards. The minimum acceptable value is 64 Kbytes expressed as pages using the page size returned by getpagesize(3C).

Unstable

Defines the number of pages that the system requires be unlocked. If a request to lock pages would force available memory below this value, that request is refused.

Unsigned long

The greater of (tune_t_minarmem + 100 and [4% of memory available at boot time + 4 Mbytes])

Minimum value enforced by the system is tune_t_minarmem + 100. The system does not enforce a maximum value.

Pages

Yes, unless dynamic reconfiguration operations that add or delete memory occur. At that point, the value is reset to whatever was provided in the /etc/system file or was calculated.

If the value specified in the /etc/system file or the calculated default is less than tune_t_minarmem + 100, the value is reset to tune_t_minarmem + 100.

No message is displayed if the value from the /etc/system file is increased. Done only at boot time, and during dynamic reconfiguration operations that involve adding or deleting memory.

When memory locking requests or attaching to a shared memory segment with the SHARE_MMU flag fails, yet the amount of memory available seems to be sufficient.

Excessively large values can cause memory locking requests (mlock(3C), mlockall(3C), andmemcntl(2)) to fail unnecessarily.

Unstable

For information, see "pages_pp_maximum (Pre-Solaris 9 Releases)".

The minimum available resident (not swappable) memory to maintain in order to avoid deadlock. Used to reserve a portion of memory for use by the core of the operating system. Pages restricted in this way are not seen when the OS determines the maximum amount of memory available.

Signed integer

25

1 to physical memory

Pages

No

None. Large values result in wasted physical memory.

The default value is generally adequate. Consider increasing it if the system locks up and debugging information indicates the problem was because no memory was available.

Unstable

Maximum number of pages per second that the system looks at when memory pressure is highest.

Signed integer

The lesser of 64 Mbytes and 1/2 of physical memory.

1 to one-half of physical memory

Pages

Yes, unless dynamic reconfiguration operations that add or delete memory occur. At that point, the value is reset to whatever was provided by /etc/system or was calculated from the new physical memory value.

Maximum value is the lesser of 64 Mbytes and 1/2 of physical memory.

When more aggressive scanning of memory is desired during periods of memory shortfall, especially if the system is subject to periods of intense memory demand or when performing heavy file I/O.

Unstable

Minimum number of pages per second that the system looks at when attempting to reclaim memory.

Signed integer

The smaller of 1/20th of physical memory in pages and 100.

1 to fastscan / 2

Pages

Yes, unless dynamic reconfiguration operations that add or delete memory occur. At that point, the value is reset to whatever was provided in the /etc/system file or was calculated from the new physical memory value.

If slowscan is larger than fastscan / 2, slowscan is reset to fastscan / 2. No message is displayed.

When more aggressive scanning of memory is desired during periods of memory shortfall especially if the system is subject to periods of intense memory demand.

Unstable