sys_attrs_pwrmgr(5) [osf1 man page]
sys_attrs_pwrmgr(5) File Formats Manual sys_attrs_pwrmgr(5) NAME
sys_attrs_pwrmgr - pwrmgr subsystem attributes DESCRIPTION
This reference page lists and describes attributes for the Power Manager (pwrmgr) kernel subsystem. To change these attributes so that they take effect each time you boot the system, you create a stanza file with the attribute settings you want and then use the sysconfigdb com- mand to update the system configuration database with the information in this file. See the EXAMPLES section for more information about this process. Refer to the sys_attrs(5) reference page for an general introduction to the topic of kernel subsystem attributes. A value that enables (1) or disables (0) CPU slowdown after the CPU becomes idle. A value that enables (1) or disables (0) all power management functions (for CPU, disks, and graphics hardware). The number of min- utes to wait before powering down registered disks after they become idle. A value that enables (1) or disables (0) disk spindown after registered disks become idle. The number of minutes before entering DPMS off mode after display hardware has become idle. If you specify 0 for this attribute, DPMS off mode is disabled. A value that enables (1) or disables (0) Display Power Management Signaling (DPMS) modes for graphics display hardware. The number of minutes before entering DPMS standby mode after display hardware has become idle. If you specify 0 for this attribute, DPMS standby mode is disabled. The number of minutes before entering DPMS suspend mode after display hardware has become idle. If you specify 0 for this attribute, DPMS suspend mode is disabled. EXAMPLES
The following example shows a sample stanza file named power_mgr.stanza: pwrmgr: default_pwrmgr_state=1 cpu_slowdown=1 disk_spindown=1 disk_dwell_time=20 graphics_powerdown=1 graphics_standby_dwell=5 graphics_suspend_dwell=10 graphics_off_dwell=15 This file: Enables power management in general, plus all three of the power management options for idle hardware (CPU slowdown, disk spin- down, and DPMS modes for graphics displays) Specifies a wait of 20 minutes before spinning down a disk after it has become idle Specifies a wait of 5, 10, and 15 minutes before entering DPMS standby, suspend, and off modes, respectively, after graphics display hardware has become idle See stanza(4) for more information about stanza files. The following command updates the /etc/sysconfigtab database with the information in the stanza file: # sysconfigdb -a -f power_mgr.stanza pwrmgr See sysconfigdb(8) for more information about using this command to update the system configuration database. SEE ALSO
Commands: sysconfigdb(8) Files: stanza(4) Others: sys_attrs(5) System Administration sys_attrs_pwrmgr(5)
Check Out this Related Man Page
sys_attrs(5) File Formats Manual sys_attrs(5) NAME
sys_attrs - introduction to kernel subsystem attributes used for configuration and tuning DESCRIPTION
The operating system kernel is built from many mandatory and optional subsystems. If you are logged into the root account, the following command lists the subsystems included in the kernel for your system: # /sbin/sysconfig -s The majority of the kernel subsystems have sets of attributes whose values control different aspects of subsystem configuration. You can examine the names, the current settings, and (if applicable) the minimum, and maximum settings of attributes for a particular subsystem by using the /sbin/sysconfig command. The -q option followed by the subsystem name displays attribute names and current settings. The -Q option followed by the subsystem name displays minimum and maximum settings and the kinds of operations permitted on the attribute (Config- urable (at boot time), Reconfigurable (at run time), Query only). In the Common Desktop Environment (CDE), you can run the dxkerneltuner application to get the same information. Caution A relatively small number of the attributes listed in displays from these interfaces should actually be changed through these same inter- faces and then only as part of the system configuration and tuning tasks done by an experienced system or network administrator. The set- ting of most subsystem attributes should be done indirectly through system and network setup applications or be automatically adjusted by the kernel. This fact is very important to remember because attribute settings can have complex interrelationships with one another, requiring (in some cases) careful manipulation of an entire set of attributes rather than only one. Furthermore, default settings of some subsystem attributes should never be touched, except by support personnel or by an administrator acting on instructions from support per- sonnel or patch kit documentation. Some attributes are modifiable at run time for ease of system tuning. Others are modifiable at run time only because of a software requirement and should not be changed manually. In general, do not change the default value of any system attribute manually unless the system documentation or your support representative provides directions for changing it. Some attributes have corresponding parameters in the system configuration file. If so, the corresponding parameter name in the system con- figuration file is specified in parentheses following the attribute name. In these cases, never edit the system configuration file to directly change the value of the system parameter; use the dxkerneltuner application or the /sbin/sysconfig -r command to change the value of the attribute. For some subsystems, these values are best applied through a stanza-formatted file that is specified as a parameter to the sysconfigdb command. See dxkerneltuner(8), sysconfig(8), and sysconfigdb(8) for more information about your options for configuring kernel subsystems. The following subsystems must be included when the kernel is built: Configuration Manager (cm) Generic Kernel (generic) Interprocess Commu- nication (ipc) Process (proc) Virtual File System (vfs) Virtual Memory (vm) A kernel also includes a processor-specific subsystem whose name is an internal code for a particular processor. Processor-specific subsys- tems typically have no attributes, are not modified directly by users, and are not documented. Other kernel subsystems are technically optional, although a kernel almost always includes quite a few optional subsystems in order for a system to be useful. For information on the attributes for a particular subsystem, refer to the reference page for that subsystem. The names of these reference pages adhere to the format sys_attrs_subsystem-name. For example, to see the reference page that lists and describes attributes for the generic subsystem, you can type man sys_attrs_generic at the system command line. For guidelines on changing kernel subsystem attributes to improve system performance, see the System Configuration and Tuning manual. Any discussion about changing attributes for reasons other than tuning is located in the appropriate administration or program debugging man- ual. You can adjust some subsystem attribute values at run time. If so, the attribute descriptions mention that fact. To make it easy for you to locate these attributes when scanning lists, an asterisk (*) also precedes the names of these attributes. SEE ALSO
Commands: dxkerneltuner(8), sysconfig(8), sysconfigdb(8) Others: sys_attrs_cm(5), sys_attrs_generic(5), sys_attrs_ipc(5), sys_attrs_proc(5), sys_attrs_vfs(5), sys_attrs_vm(5) This list includes only reference pages for technically required subsystems. The number of subsystems that can be configured in a kernel is very large, so all system attribute reference pages are not listed here. System Configuration and Tuning System Administration Network Administration Kernel Debugging sys_attrs(5)