projects / thirdparty / util-linux.git / blame
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1 | .\" chrt(1) manpage |
| 2 | .\" | |
| 3 | .\" Copyright (C) 2004 Robert Love | |
| 4 | .\" | |
| 5 | .\" This is free documentation; you can redistribute it and/or | |
| 6 | .\" modify it under the terms of the GNU General Public License as | |
| 7 | .\" published by the Free Software Foundation; either version 2 of | |
| 8 | .\" the License. | |
| 9 | .\" | |
| 10 | .\" The GNU General Public License's references to "object code" | |
| 11 | .\" and "executables" are to be interpreted as the output of any | |
| 12 | .\" document formatting or typesetting system, including | |
| 13 | .\" intermediate and printed output. | |
| 14 | .\" | |
| 15 | .\" This manual is distributed in the hope that it will be useful, | |
| 16 | .\" but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 17 | .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 18 | .\" GNU General Public License for more details. | |
| 19 | .\" | |
| 20 | .\" You should have received a copy of the GNU General Public | |
| 21 | .\" License along with this manual; if not, write to the Free | |
| 22 | .\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, | |
| 23 | .\" USA. | |
| 24 | .\" | |
| 25 | .\" 2002-05-11 Robert Love <rml@tech9.net> | |
| 26 | .\" Initial version | |
| 27 | .\" | |
| 28 | .TH CHRT "1" "Apr 2003" "schedutils" "Linux User's Manual" | |
| 29 | .SH NAME | |
| 30 | chrt \- manipulate real-time attributes of a process | |
| 31 | .SH SYNOPSIS | |
| 32 | .B chrt | |
| 33 | [\fIoptions\fR] [\fIprio\fR] [\fIpid\fR | \fIcommand\fR [\fIarg\fR]...] | |
| 34 | .SH DESCRIPTION | |
| 35 | .PP | |
| 36 | .BR chrt (1) | |
| 37 | sets or retrieves the real-time scheduling attributes of an existing PID or | |
| 38 | runs COMMAND with the given attributes. Both policy (one of | |
| df3773fb | 39 | .BR SCHED_OTHER , |
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40 | .BR SCHED_FIFO , |
| 41 | .BR SCHED_RR , | |
| 42 | or | |
| df3773fb | 43 | .BR SCHED_BATCH ) |
| 48d7b13a | 44 | and priority can be set and retrieved. |
| 09dd84ca KZ |
45 | .PP |
| 46 | The | |
| 47 | .BR SCHED_BATCH | |
| 48 | policy is supported since Linux 2.6.16. | |
| 48d7b13a KZ |
49 | .SH OPTIONS |
| 50 | .TP | |
| 51 | .B -p, --pid | |
| 52 | operate on an existing PID and do not launch a new task | |
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53 | .TP |
| 54 | .B -b, --batch | |
| 55 | set scheduling policy to | |
| 56 | .BR SCHED_BATCH | |
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57 | .TP |
| 58 | .B -f, --fifo | |
| 59 | set scheduling policy to | |
| 60 | .BR SCHED_FIFO | |
| 61 | .TP | |
| 62 | .B -m, --max | |
| 63 | show minimum and maximum valid priorities, then exit | |
| 64 | .TP | |
| 65 | .B -o, --other | |
| 66 | set policy scheduling policy to | |
| 67 | .BR SCHED_OTHER | |
| 68 | .TP | |
| 69 | .B -r, --rr | |
| 70 | set scheduling policy to | |
| 71 | .BR SCHED_RR | |
| 72 | (the default) | |
| 73 | .TP | |
| 74 | .B -h, --help | |
| 75 | display usage information and exit | |
| 76 | .TP | |
| 77 | .B -v, --version | |
| 78 | output version information and exit | |
| 79 | .SH USAGE | |
| 80 | .TP | |
| 81 | The default behavior is to run a new command:: | |
| 5ee00309 | 82 | chrt [prio] [command] [arguments] |
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83 | .TP |
| 84 | You can also retrieve the real-time attributes of an existing task: | |
| 85 | chrt -p [pid] | |
| 86 | .TP | |
| 87 | Or set them: | |
| 88 | chrt -p [prio] [pid] | |
| 89 | .SH PERMISSIONS | |
| 90 | A user must possess | |
| 91 | .BR CAP_SYS_NICE | |
| 92 | to change the scheduling attributes of a process. Any user can retrieve the | |
| 93 | scheduling information. | |
| 94 | .SH AUTHOR | |
| 95 | Written by Robert M. Love. | |
| 96 | .SH "REPORTING BUGS" | |
| 97 | Report bugs to <rml@tech9.net>. | |
| 98 | .SH COPYRIGHT | |
| 99 | Copyright \(co 2004 Robert M. Love | |
| 100 | .br | |
| 101 | This is free software; see the source for copying conditions. There is NO | |
| 102 | warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| 103 | .SH "SEE ALSO" | |
| 104 | .BR taskset (1), | |
| 105 | .BR nice (1), | |
| 106 | .BR renice (1) | |
| 107 | .sp | |
| 108 | See | |
| 109 | .BR sched_setscheduler (2) | |
| 110 | for a description of the Linux scheduling scheme. |