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1 | .\" Copyright (c) 1980 Regents of the University of California. |
2 | .\" All rights reserved. The Berkeley software License Agreement | |
3 | .\" specifies the terms and conditions for redistribution. | |
4 | .\" | |
852d175d | 5 | .\" @(#)getrusage.2 5.1 (Berkeley) %G% |
3031ff5e | 6 | .\" |
852d175d | 7 | .TH GETRUSAGE 2 "18 July 1983" |
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8 | .UC 4 |
9 | .SH NAME | |
852d175d | 10 | getrusage \- get information about resource utilization |
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11 | .SH SYNOPSIS |
12 | .nf | |
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13 | .ft B |
14 | #include <sys/time.h> | |
15 | #include <sys/resource.h> | |
3031ff5e | 16 | .PP |
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17 | .ft B |
18 | .ta \w'#define 'u +\w'RUSAGE_CHILDREN 'u +\w'-1 'u | |
19 | #define RUSAGE_SELF 0 /* calling process */ | |
20 | #define RUSAGE_CHILDREN -1 /* terminated child processes */ | |
21 | .DT | |
22 | .PP | |
23 | .ft B | |
24 | getrusage(who, rusage) | |
25 | int who; | |
26 | struct rusage *rusage; | |
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27 | .fi |
28 | .SH DESCRIPTION | |
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29 | .I Getrusage |
30 | returns information describing the resources utilized by the current | |
31 | process, or all its terminated child processes. | |
32 | The | |
33 | .I who | |
34 | parameter is one of RUSAGE_SELF and RUSAGE_CHILDREN. | |
35 | If | |
36 | .I rusage | |
37 | is non-zero, the buffer it points to will be filled in with | |
38 | the following structure: | |
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39 | .PP |
40 | .nf | |
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41 | .RS |
42 | .ta \w'struct 'u +\w'struct 'u +3u*\w'struct 'u | |
43 | struct rusage { | |
44 | struct timeval ru_utime; /* user time used */ | |
45 | struct timeval ru_stime; /* system time used */ | |
46 | int ru_maxrss; | |
47 | int ru_ixrss; /* integral shared memory size */ | |
48 | int ru_idrss; /* integral unshared data size */ | |
49 | int ru_isrss; /* integral unshared stack size */ | |
50 | int ru_minflt; /* page reclaims */ | |
51 | int ru_majflt; /* page faults */ | |
52 | int ru_nswap; /* swaps */ | |
53 | int ru_inblock; /* block input operations */ | |
54 | int ru_oublock; /* block output operations */ | |
55 | int ru_msgsnd; /* messages sent */ | |
56 | int ru_msgrcv; /* messages received */ | |
57 | int ru_nsignals; /* signals received */ | |
58 | int ru_nvcsw; /* voluntary context switches */ | |
59 | int ru_nivcsw; /* involuntary context switches */ | |
60 | }; | |
61 | .RE | |
62 | .DT | |
3031ff5e | 63 | .fi |
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64 | .PP |
65 | The fields are interpreted as follows: | |
66 | .TP 15 | |
67 | ru_utime | |
68 | the total amount of time spent executing in user mode. | |
69 | .TP 15 | |
70 | ru_stime | |
71 | the total amount of time spent in the system executing on behalf | |
72 | of the process(es). | |
73 | .TP 15 | |
74 | ru_maxrss | |
75 | the maximum resident set size utilized (in kilobytes). | |
76 | .TP 15 | |
77 | ru_ixrss | |
78 | an \*(lqintegral\*(rq value indicating the amount of memory used | |
79 | which was also shared among other processes. This value is expressed | |
80 | in units of kilobytes * seconds-of-execution and is calculated by | |
81 | summing the number of shared memory pages in use each time the internal | |
82 | system clock ticks and then averaging over 1 second intervals. | |
83 | .TP 15 | |
84 | ru_idrss | |
85 | an integral value of the amount of unshared memory residing in the | |
86 | data segment of a process (expressed in units of | |
87 | kilobytes * seconds-of-execution). | |
88 | .TP 15 | |
89 | ru_isrss | |
90 | an integral value of the amount of unshared memory residing in the | |
91 | stack segment of a process (expressed in units of | |
92 | kilobytes * seconds-of-execution). | |
93 | .TP 15 | |
94 | ru_minflt | |
95 | the number of page faults serviced without any i/o activity; here | |
96 | i/o activity is avoided by \*(lqreclaiming\*(rq a page frame from | |
97 | the list of pages awaiting reallocation. | |
98 | .TP 15 | |
99 | ru_majflt | |
100 | the number of page faults serviced which required i/o activity. | |
101 | .TP 15 | |
102 | ru_nswap | |
103 | the number of times a process was \*(lqswapped\*(rq out of main | |
104 | memory. | |
105 | .TP 15 | |
106 | ru_inblock | |
107 | the number of times the file system had to perform input. | |
108 | .TP 15 | |
109 | ru_outblock | |
110 | the number of times the file system had to perform output. | |
111 | .TP 15 | |
112 | ru_msgsnd | |
113 | the number of ipc messages sent. | |
114 | .TP 15 | |
115 | ru_msgrcv | |
116 | the number of ipc messages received. | |
117 | .TP 15 | |
118 | ru_nsignals | |
119 | the number of signals delivered. | |
120 | .TP 15 | |
121 | ru_nvcsw | |
122 | the number of times a context switch resulted due to a process | |
123 | voluntarily giving up the processor before its time slice was | |
124 | completed (usually to await availability of a resource). | |
125 | .TP 15 | |
126 | ru_nivcsw | |
127 | the number of times a context switch resulted due to a higher | |
128 | priority process becoming runnable or because the current process | |
129 | exceeded its time slice. | |
130 | .SH NOTES | |
131 | The numbers | |
132 | .I ru_inblock | |
133 | and | |
134 | .I ru_outblock | |
135 | account only for real | |
136 | i/o; data supplied by the cacheing mechanism is charged only | |
137 | to the first process to read or write the data. | |
138 | .SH SEE ALSO | |
139 | gettimeofday(2), wait(2) | |
140 | .SH BUGS | |
141 | There is no way to obtain information about a child process | |
142 | which has not yet terminated. |