lgrp_mem_default_policy

Description

This variable reflects the default memory allocation policy used by the Solaris OS. This variable is an integer, and its value should correspond to one of the policies listed in the sys/lgrp.h file.

Data Type

Integer

Default

1, LGRP_MEM_POLICY_NEXT indicating that memory allocation defaults to the home lgroup of the thread performing the memory allocation.

Range

Possible values are:

Value	Description	Comment
0	LGRP_MEM_POLICY_DEFAULT	use system default policy
1	LGRP_MEM_POLICY_NEXT	next to allocating thread's home lgroup
2	LGRP_MEM_POLICY_RANDOM_PROC	randomly across process
3	LGRP_MEM_POLICY_RANDOM_PSET	randomly across processor set
4	LGRP_MEM_POLICY_RANDOM	randomly across all lgroups
5	LGRP_MEM_POLICY_ROUNDROBIN	round robin across all lgroups
6	LGRP_MEM_POLICY_NEXT_CPU	near next CPU to touch memory

Dynamic?

No

Validation

None

When to Change

For applications that are sensitive to memory latencies due to allocations that occur from remote versus local memory on systems that use NUMA.

Commitment Level

Uncommitted