1.CAP_BYPASS_RAC_VMM - A process has the ability to bypass restrictions on VMM resource usage.

2.CAP_PROPAGATE - All capabilities are inherited by child processes.

3.CAP_NUMA_ATTACH - A process has the ability to bind to specific resources.

主要是用于large page 提高性能

Guide to Multiple Page Size Support
on AIX 5L Version 5.3
March, 2006
David Hepkin
IBM Corporation
Contributors: Augie Mena, Greg Mewhinney

The memory allocated to 16MB pages can only be used for 16MB pages, and the
memory allocated to 16GB pages can only be used for 16GB pages. Thus, pages of these
aixtrmultiplepagewp030206.doc 4
sizes should only be configured in high-performance environments. The use of 16MB
and 16GB pages is restricted. In order to allocate pages of these sizes, a user must have
the CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities or have root
authority. The chuser command can be used to grant these capabilities to users.

如果用上large page

可以用vmstat -l 看会多出三列内容

$ vmstat -l
System configuration: lcpu=2 mem=7424MB
kthr memory page faults cpu large-page
----- ----------- ------------------------ ------------ ----------- -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa alp flp
1 1 433591 338295 0 0 0 0 0 0 85 382 340 0 0 99 0 0 0

ITPub博客

oracle 10.2.0.4版本或以上需要对操作系统用户设置的capabilities解释

最新文章