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Revision 1.1 - (hide 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 unnilennium 1.1 .\" 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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