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Contents of /rpms/cpuspeed/sme10/cpuspeed.8

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Revision 1.1 - (show annotations) (download)
Thu Mar 17 16:10:39 2016 UTC (8 years, 7 months ago) by unnilennium
Branch: MAIN
CVS Tags: cpuspeed-1_5-23_el7_sme, cpuspeed-1_5-23_el7_centos, HEAD
Initial import

1 .\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.36.
2 .TH CPUSPEED "8" "October 08, 2008" "cpuspeed v1.5.1" "Program Options"
3 .SH NAME
4 cpuspeed \- user-space cpu frequency scaling program, v1.5.1
5 .SH SYNOPSIS
6 .B cpuspeed
7 [\fIOptions\fR]
8 .SH DESCRIPTION
9 cpuspeed v1.5.1
10 .PP
11 This program monitors the system's idle percentage and reduces or raises the
12 CPUs' clock speeds and voltages accordingly to minimize power consumption
13 when idle and maximize performance when needed. This is the default.
14 .PP
15 The program may also optionally be configured to reduce the CPUs' clock
16 speeds if the temperature gets too high, NOT minimize their speeds if the
17 computer's AC adapter is disconnected or maximize their speeds when the AC
18 adapter is connected.
19 .PP
20 By default this program will manage every CPU found in the system.
21 .IP
22 Options:
23 .HP
24 \fB\-d\fR
25 .IP
26 Tells the process to daemonize itself (run in background).
27 .HP
28 \fB\-i\fR <interval>
29 .IP
30 Sets the interval between idle percentage tests and possible speed
31 changes in tenths of a second (default is 20).
32 .HP
33 \fB\-p\fR <fast up> <threshold>
34 .IP
35 Sets the CPU core idle percentage thresholds. <fast up> is the idle
36 percentage below which a CPU core will be set to the highest possible
37 speed. <threshold> is the idle percentage above which a CPU core's
38 speed will be decreased and below which a CPU core's speed will be
39 increased (defaults are 10 and 25).
40 .HP
41 \fB\-m\fR <minimum speed>
42 .IP
43 Sets the minimum speed in KHz below which a CPU core will not be set.
44 .HP
45 \fB\-M\fR <maximum speed>
46 .IP
47 Sets the maximum speed in KHz above which a CPU core will not be set.
48 .HP
49 \fB\-n\fR
50 .IP
51 Do not treat niced programs as idle time.
52 .HP
53 \fB\-w\fR
54 .IP
55 Do not treat time waiting for IO as idle time.
56 .HP
57 \fB\-t\fR <temp file> <maxtemp>
58 .IP
59 Sets the ACPI temperature file and the temperature at which CPUs
60 will be set to minimum speed.
61 .HP
62 \fB\-T\fR <interval>
63 .IP
64 Sets the interval at which the temperature will be polled in
65 tenths of a second (default is 10).
66 (Requires the '\-t' option above.)
67 .HP
68 \fB\-a\fR <AC file>
69 .IP
70 Sets the ACPI AC adapter state file and tells the program to set
71 the CPUs to minimum speed when the AC adapter is disconnected.
72 (This is the default but is changeable by the '\-D' option below).
73 .HP
74 \fB\-A\fR <interval>
75 .IP
76 Sets the interval at which the AC adapter state will be polled in
77 tenths of a second (default is 50).
78 (Requires the '\-a' option above.)
79 .HP
80 \fB\-C\fR
81 .IP
82 Run at maximum speed when AC adapter is connected.
83 (Requires the '\-a' option above.)
84 .HP
85 \fB\-D\fR
86 .IP
87 Do NOT force minimum speed when AC adapter is disconnected.
88 (Requires the '\-a' option above.)
89 .HP
90 \fB\-r\fR
91 .IP
92 Restores previous speed on program exit.
93 .HP
94 \fB\-S\fR <CPU core 1> [[<CPU core 2>] ...]
95 .IP
96 Manage only a single group of CPU cores. All of the specified
97 cores will controlled as a single group (locked to the same speed)
98 and are in the range 0 to n-1 where 'n' is the total number of CPU
99 cores in the system. Note that when specifying multiple cores the
100 list must be enclosed in quotes. Without this option the program
101 creates copies of itself to manage every core of every CPU in the
102 system and automatically determines core groups. If you are running
103 on an old kernel and get an error message about not being able to
104 open an "affected_cpus" file then you must run this program
105 separately for each group of cores that must be controlled together
106 (which probably means for each physical CPU) and use this option.
107 .SS "Notes:"
108 To have a CPU core stay at the highest clock speed to maximize performance send
109 the process controlling that CPU core the SIGUSR1 signal.
110 .PP
111 To have a CPU core stay at the lowest clock speed to maximize battery life send
112 the process controlling that CPU core the SIGUSR2 signal.
113 .PP
114 To resume having a CPU core's clock speed dynamically scaled send the process
115 controlling that CPU core the SIGHUP signal.
116 .PP
117 Many modern Linux systems support in-kernel cpu frequency scaling. The
118 cpuspeed daemon only works in conjunction with the 'userspace' frequency
119 scaling governor. Other governors, such as 'ondemand' and 'conservative',
120 rely on the Linux kernel to adjust cpu frequencies on the fly without the
121 need of any user-space assistance, such as that provided by cpuspeed.
122 .PP
123 Red Hat and Fedora distributions employ a unified configuration file
124 for both scenarios, as well as a cpuspeed init script that will configure
125 either cpuspeed or in-kernel cpu frequency scaling, as appropriate.
126 .SH "FILES"
127 .na
128 .nf
129 /etc/sysconfig/cpuspeed, configuration file
130 /etc/init.d/cpuspeed, initialzation script
131 /usr/sbin/cpuspeed, cpuspeed program
132 .SH "SEE ALSO"
133 .PP
134 The CPUSpeed web page:
135 \fB http://carlthompson.net/Software/CPUSpeed\fR
136 .SH "LICENSE"
137 .PP
138 CPUSpeed is released under the GNU General Public License version 2 (or if
139 you wish any later version). This license allows you to use, copy,
140 distribute and modify the software with very few restrictions. The full
141 text of the license may be found here:
142 \fBhttp://carlthompson.net/Software/CPUSpeed/License\fR
143 .SH "AUTHOR(S):"
144 .TP
145 CPUSpeed daemon, original init script and configuration file:
146 .na
147 .nf
148 Carl Thompson \- cet [at] carlthompson.net
149 (copyright 2002 \- 2008)
150 .TP
151 Modernized init script, configuration file and man page:
152 .na
153 .nf
154 Dave Jones \- davej [at] redhat.com
155 Michal Jaegermann \- michal [at] harddata.com
156 Jarod Wilson \- jwilson [at] redhat.com

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