dispadmin(1MSRM)

NAME | SYNOPSIS | ADDENDUM | EXAMPLES | ATTRIBUTES | SEE ALSO | NOTES

NAME

dispadmin- process scheduler administration

SYNOPSIS

dispadmin -l
dispadmin -c SHR -g [-r res]
dispadmin -c SHR -s file

ADDENDUM

When Solaris Resource Manager is installed, it includes the Solaris Resource Manager CPU scheduler, which has a class name of "SHR." The dispadmin command can be used to identify the presence of the SHR class and to get or set the time slice quantum used by the SHR scheduler.

The SHR scheduler uses the same range of global scheduling priorities as the TS scheduling class (see ts_dptbl(4)). However, the priority assignments of processes are dynamically managed by the SHR scheduler to achieve CPU run-rate sharing for users, without the use of a dispatcher table. Consequently, there is no separate loadable module to provide this table.

The remaining parameter, the time slice quantum, may be examined and modified on a running system. The time slice quantum is the length of the time quantum allocated to processes in ticks (Hz). A CPU-bound process will usually run for the duration of the quantum before being preempted in favor of any higher priority process. The default time slice quantum of 11 ticks is a reasonable compromise between interactive responsiveness and system overheads due to process context switching. Larger values could be used on systems where the workload is CPU-bound and non-interactive. Smaller values may improve interactive responsiveness at the cost of increased context switching.

EXAMPLES

The -l option displays configured scheduler classes, typically:

CONFIGURED CLASSES
SYS	(System Class)
SHR	((SHR) SRM Scheduler)
. . .

The following command retrieves the current quantum for the SHR class from kernel memory and writes it to the standard output. The time quantum value is expressed in hundredths of a second.

---

dispadmin -c SHR -g -r 100

---

The output might be:

---

 
# 
 # (SHR) SRM Scheduler Configuration
 # 
  Resolution=100    # Resolution

  Quantum=11          # Global time quantum for all processes

---

If this were saved in a file, shr.config, for example, the values could be edited and the quantum used by the kernel overwritten with the command:

---

dispadmin -c SHR -s shr.config

---

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Architecture	SPARC
Availability	SUNWsrmb

SEE ALSO

priocntl(1), ts_dptbl(4), priocntl(1MSRM), srm(5SRM)

Solaris Resource Manager 1.3 System Administration Guide

NOTES

This man page is applicable to SunOS 5.6, SunOS 5.7, and SunOS 5.8.

SunOS 5.8  Last Revised 7 Dec 1998

NAME | SYNOPSIS | ADDENDUM | EXAMPLES | ATTRIBUTES | SEE ALSO | NOTES