193 lines
4.1 KiB
HTML
193 lines
4.1 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of CHCPU</TITLE>
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</HEAD><BODY>
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<H1>CHCPU</H1>
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Section: System Administration (8)<BR>Updated: July 2014<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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chcpu - configure CPUs
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>chcpu</B>
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<B>-c</B>|<B>-d</B>|<B>-e</B>|<B>-g</B>
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<I>cpu-list</I>
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<BR>
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<B>chcpu -p</B>
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<I>mode</I>
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<BR>
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<B>chcpu</B>
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<B>-r</B>|<B>-h</B>|<B>-V</B>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>chcpu</B>
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can modify the state of CPUs. It can enable or disable CPUs, scan for new
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CPUs, change the CPU dispatching
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<I>mode</I>
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of the underlying hypervisor, and request CPUs from the hypervisor
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(configure) or return CPUs to the hypervisor (deconfigure).
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<P>
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Some options have a
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<I>cpu-list</I>
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argument. Use this argument to specify a comma-separated list of CPUs. The
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list can contain individual CPU addresses or ranges of addresses. For
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example,
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<B>0,5,7,9-11</B>
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makes the command applicable to the CPUs with the addresses 0, 5, 7, 9, 10,
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and 11.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<DL COMPACT>
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<DT id="1"><B>-c</B>,<B> --configure </B><I>cpu-list</I>
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<DD>
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Configure the specified CPUs. Configuring a CPU means that the hypervisor
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takes a CPU from the CPU pool and assigns it to the virtual hardware on which
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your kernel runs.
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<DT id="2"><B>-d</B>,<B> --disable </B><I>cpu-list</I>
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<DD>
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Disable the specified CPUs. Disabling a CPU means that the kernel sets it
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offline.
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<DT id="3"><B>-e</B>,<B> --enable </B><I>cpu-list</I>
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<DD>
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Enable the specified CPUs. Enabling a CPU means that the kernel sets it
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online. A CPU must be configured, see <B>-c</B>, before it can be enabled.
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<DT id="4"><B>-g</B>,<B> --deconfigure </B><I>cpu-list</I>
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<DD>
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Deconfigure the specified CPUs. Deconfiguring a CPU means that the
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hypervisor removes the CPU from the virtual hardware on which the Linux
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instance runs and returns it to the CPU pool. A CPU must be offline, see
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<B>-d</B>, before it can be deconfigured.
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<DT id="5"><B>-p</B>,<B> --dispatch </B><I>mode</I>
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<DD>
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Set the CPU dispatching
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<I>mode</I>
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(polarization). This option has an effect only if your hardware architecture
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and hypervisor support CPU polarization. Available
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<I>modes</I>
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are:
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<DL COMPACT><DT id="6"><DD>
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<DL COMPACT>
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<DT id="7">
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<DD>
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<B>horizontal</B>
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The workload is spread across all available CPUs.
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<DT id="8"><B>vertical</B>
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<DD>
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The workload is concentrated on few CPUs.
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</DL>
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</DL>
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<DT id="9"><B>-r</B>,<B> --rescan</B>
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<DD>
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Trigger a rescan of CPUs. After a rescan, the Linux kernel recognizes
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the new CPUs. Use this option on systems that do not
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automatically detect newly attached CPUs.
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<DT id="10"><B>-V</B>,<B> --version</B>
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<DD>
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Display version information and exit.
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<DT id="11"><B>-h</B>,<B> --help</B>
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<DD>
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Display help text and exit.
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<P>
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</DL>
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<A NAME="lbAF"> </A>
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<H2>RETURN CODES</H2>
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<B>chcpu</B>
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has the following return codes:
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<DL COMPACT>
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<DT id="12"><B>0</B>
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<DD>
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success
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<DT id="13"><B>1</B>
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<DD>
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failure
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<DT id="14"><B>64</B>
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<DD>
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partial success
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</DL>
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<A NAME="lbAG"> </A>
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<H2>AUTHOR</H2>
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Heiko Carstens
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<A NAME="lbAH"> </A>
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<H2>COPYRIGHT</H2>
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Copyright IBM Corp. 2011
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<BR>
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<A NAME="lbAI"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+lscpu">lscpu</A></B>(1)
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<A NAME="lbAJ"> </A>
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<H2>AVAILABILITY</H2>
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The chcpu command is part of the util-linux package and is available from
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Linux Kernel Archive
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="15"><A HREF="#lbAB">NAME</A><DD>
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<DT id="16"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="17"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="18"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="19"><A HREF="#lbAF">RETURN CODES</A><DD>
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<DT id="20"><A HREF="#lbAG">AUTHOR</A><DD>
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<DT id="21"><A HREF="#lbAH">COPYRIGHT</A><DD>
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<DT id="22"><A HREF="#lbAI">SEE ALSO</A><DD>
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<DT id="23"><A HREF="#lbAJ">AVAILABILITY</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:11 GMT, March 31, 2021
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</BODY>
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</HTML>
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