dispadmin(1M) manual page
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dispadmin - process scheduler administration
dispadmin -l
dispadmin -c class -g [-r res]
dispadmin -c class -s file
SUNWcsu
The dispadmin
command displays or changes process scheduler parameters while the system
is running.
dispadmin does limited checking on the values supplied in file
to verify that they are within their required bounds. The checking, however,
does not attempt to analyze the effect that the new values have on the
performance of the system. Inappropriate values can have a negative effect
on system performance. (See
- -l
- Lists the scheduler classes currently configured in the system.
- -c class
- Specifies the class whose parameters are to be displayed or changed.
Valid class values are: RT for the real-time class, TS for the time-sharing
class, and IA for the inter-active class. The time-sharing and inter-active
classes share the same scheduler, so changes to the scheduling parameters
of one will change those of the other.
- -g
- Gets the parameters for the specified
class and writes them to the standard output. Parameters for the real-time
class are described in rt_dptbl(4)
. Parameters for the time-sharing and inter-active
classes are described in ts_dptbl(4)
.
- -r res
- When using the -g option you
may also use the -r option to specify a resolution to be used for outputting
the time quantum values. If no resolution is specified, time quantum values
are in milliseconds. If res is specified it must be a positive integer between
1 and 1000000000 inclusive, and the resolution used is the reciprocal of
res in seconds. For example, a res value of 10 yields time quantum values
expressed in tenths of a second; a res value of 1000000 yields time quantum
values expressed in microseconds. If the time quantum cannot be expressed
as an integer in the specified resolution, it is rounded up to the next
integral multiple of the specified resolution.
- -s file
- Sets scheduler parameters
for the specified class using the values in file. These values overwrite
the current values in memory--they become the parameters that control scheduling
of processes in the specified class. The values in file must be in the format
output by the -g option. Moreover, the values must describe a table that
is the same size (has same number of priority levels) as the table being
overwritten. Super-user privileges are required in order to use the -s option.
Note: The -g and -s options are mutually exclusive: you may not retrieve
the table at the same time you are overwriting it.
The following
command retrieves the current scheduler parameters for the real-time class
from kernel memory and writes them to the standard output. Time quantum
values are in microseconds. dispadmin -c RT -g -r 1000000
The following command
overwrites the current scheduler parameters for the real-time class with
the values specified in rt.config.
dispadmin -c RT -s rt.config
The following
command retrieves the current scheduler parameters for the time-sharing
class from kernel memory and writes them to the standard output. Time quantum
values are in nanoseconds.
dispadmin -c TS -g -r 1000000000
The following command
overwrites the current scheduler parameters for the time-sharing class with
the values specified in ts.config.
dispadmin -c TS -s ts.config
priocntl(1)
,
priocntl(2)
, rt_dptbl(4)
, ts_dptbl(4)
,
dispadmin prints an
appropriate diagnostic message if it fails to overwrite the current scheduler
parameters due to lack of required permissions or a problem with the specified
input file.
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