1 The cpupower package consists of the following elements:
6 On x86 pciutils is needed at runtime (-lpci).
7 For compilation pciutils-devel (pci/pci.h) and a gcc version
8 providing cpuid.h is needed.
9 For both it's not explicitly checked for (yet).
15 "libcpupower" is a library which offers a unified access method for userspace
16 tools and programs to the cpufreq core and drivers in the Linux kernel. This
17 allows for code reduction in userspace tools, a clean implementation of
18 the interaction to the cpufreq core, and support for both the sysfs and proc
19 interfaces [depending on configuration, see below].
22 compilation and installation
23 ----------------------------
25 There are 2 output directories - one for the build output and another for
26 the installation of the build results, that is the utility, library,
32 In the case of default directory, build and install process requires no
33 additional parameters:
40 The output directory for the 'make' command is the current directory and
41 its subdirs in the kernel tree:
49 'make install' command puts targets to default system dirs:
51 -----------------------------------------------------------------------
52 | Installing file | System dir |
53 -----------------------------------------------------------------------
54 | libcpupower | /usr/lib |
55 -----------------------------------------------------------------------
56 | cpupower | /usr/bin |
57 -----------------------------------------------------------------------
58 | cpufreq-bench_plot.sh | /usr/bin |
59 -----------------------------------------------------------------------
60 | man pages | /usr/man |
61 -----------------------------------------------------------------------
63 To put it in other words it makes build results available system-wide,
64 enabling any user to simply start using it without any additional steps
69 There are 2 make's command-line variables 'O' and 'DESTDIR' that setup
72 'DESTDIR' - installation directory. This variable could also be setup in
73 the 'CONFIGURATION' block of the "Makefile"
78 $ make O=<your_custom_build_catalog>
81 $ make O=/home/hedin/prj/cpupower/build
86 $ make O=<your_custom_build_catalog> DESTDIR=<your_custom_install_catalog>
89 $ make O=/home/hedin/prj/cpupower/build DESTDIR=/home/hedin/prj/cpupower \
92 Notice that both variables 'O' and 'DESTDIR' have been provided. The reason
93 is that the build results are saved in the custom output dir defined by 'O'
94 variable. So, this dir is the source for the installation step. If only
95 'DESTDIR' were provided then the 'install' target would assume that the
96 build directory is the current one, build everything there and install
99 The files will be installed to the following dirs:
101 -----------------------------------------------------------------------
102 | Installing file | System dir |
103 -----------------------------------------------------------------------
104 | libcpupower | ${DESTDIR}/usr/lib |
105 -----------------------------------------------------------------------
106 | cpupower | ${DESTDIR}/usr/bin |
107 -----------------------------------------------------------------------
108 | cpufreq-bench_plot.sh | ${DESTDIR}/usr/bin |
109 -----------------------------------------------------------------------
110 | man pages | ${DESTDIR}/usr/man |
111 -----------------------------------------------------------------------
113 If you look at the table for the default 'make' output dirs you will
114 notice that the only difference with the non-default case is the
115 ${DESTDIR} prefix. So, the structure of the output dirs remains the same
116 regardles of the root output directory.
122 'clean' target is intended for cleanup the build catalog from build results
123 'uninstall' target is intended for removing installed files from the
124 installation directory
129 This case is a straightforward one:
136 Use 'O' command line variable to remove previously built files from the
138 $ make O=<your_custom_build_catalog> clean
141 $ make O=/home/hedin/prj/cpupower/build clean
143 Use 'DESTDIR' command line variable to uninstall previously installed files
145 $ make DESTDIR=<your_custom_install_catalog>
148 make DESTDIR=/home/hedin/prj/cpupower uninstall
162 When it comes to run the utility from the custom build catalog things
163 become a little bit complicated as 'just run' approach doesn't work.
164 Assuming that the current dir is '<your_custom_install_catalog>/usr',
165 issuing the following command:
167 $ sudo ./bin/cpupower
168 will produce the following error output:
169 ./bin/cpupower: error while loading shared libraries: libcpupower.so.1:
170 cannot open shared object file: No such file or directory
172 The issue is that binary cannot find the 'libcpupower' library. So, we
173 shall point to the lib dir:
174 sudo LD_LIBRARY_PATH=lib64/ ./bin/cpupower
179 Many thanks to Mattia Dongili who wrote the autotoolization and
180 libtoolization, the manpages and the italian language file for cpupower;
181 to Dave Jones for his feedback and his dump_psb tool; to Bruno Ducrot for his
182 powernow-k8-decode and intel_gsic tools as well as the french language file;
183 and to various others commenting on the previous (pre-)releases of