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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 | .\" | |
3311b706 | 5 | .\" @(#)vtimes.3 6.3 (Berkeley) %G% |
af0bc818 | 6 | .\" |
c86e0a67 | 7 | .TH VTIMES 3C "" |
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8 | .UC 4 |
9 | .SH NAME | |
10 | vtimes \- get information about resource utilization | |
11 | .SH SYNOPSIS | |
12 | .nf | |
258190a5 DS |
13 | .PP |
14 | .B "#include <sys/vtimes.h>" | |
15 | .PP | |
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16 | .B "vtimes(par_vm, ch_vm)" |
17 | .B "struct vtimes *par_vm, *ch_vm;" | |
18 | .fi | |
19 | .SH DESCRIPTION | |
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20 | .ft B |
21 | This facility is superseded by getrusage(2). | |
22 | .ft R | |
23 | .PP | |
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24 | .I Vtimes |
25 | returns accounting information for the current process and for | |
26 | the terminated child processes of the current | |
27 | process. Either | |
28 | .I par_vm | |
29 | or | |
30 | .I ch_vm | |
31 | or both may be 0, in which case only the information for the pointers | |
32 | which are non-zero is returned. | |
33 | .PP | |
34 | After the call, each buffer contains information as defined by the | |
35 | contents of the include file | |
36 | .I /usr/include/sys/vtimes.h: | |
37 | .LP | |
38 | .nf | |
39 | struct vtimes { | |
40 | int vm_utime; /* user time (*HZ) */ | |
41 | int vm_stime; /* system time (*HZ) */ | |
42 | /* divide next two by utime+stime to get averages */ | |
43 | unsigned vm_idsrss; /* integral of d+s rss */ | |
44 | unsigned vm_ixrss; /* integral of text rss */ | |
45 | int vm_maxrss; /* maximum rss */ | |
46 | int vm_majflt; /* major page faults */ | |
47 | int vm_minflt; /* minor page faults */ | |
48 | int vm_nswap; /* number of swaps */ | |
49 | int vm_inblk; /* block reads */ | |
50 | int vm_oublk; /* block writes */ | |
51 | }; | |
52 | .fi | |
53 | .PP | |
54 | The | |
55 | .I vm_utime | |
56 | and | |
57 | .I vm_stime | |
58 | fields give the user and system | |
59 | time respectively in 60ths of a second (or 50ths if that | |
60 | is the frequency of wall current in your locality.) The | |
61 | .I vm_idrss | |
62 | and | |
63 | .I vm_ixrss | |
64 | measure memory usage. They are computed by integrating the number of | |
65 | memory pages in use each | |
66 | over cpu time. They are reported as though computed | |
67 | discretely, adding the current memory usage (in 512 byte | |
68 | pages) each time the clock ticks. If a process used 5 core | |
69 | pages over 1 cpu-second for its data and stack, then | |
70 | .I vm_idsrss | |
71 | would have the value 5*60, where | |
72 | .I vm_utime+vm_stime | |
73 | would be the 60. | |
74 | .I Vm_idsrss | |
75 | integrates data and stack segment | |
76 | usage, while | |
77 | .I vm_ixrss | |
78 | integrates text segment usage. | |
79 | .I Vm_maxrss | |
80 | reports the maximum instantaneous sum of the | |
81 | text+data+stack core-resident page count. | |
82 | .PP | |
83 | The | |
84 | .I vm_majflt | |
85 | field gives the number of page faults which | |
86 | resulted in disk activity; the | |
87 | .I vm_minflt | |
88 | field gives the | |
89 | number of page faults incurred in simulation of reference | |
90 | bits; | |
91 | .I vm_nswap | |
92 | is the number of swaps which occurred. The | |
93 | number of file system input/output events are reported in | |
94 | .I vm_inblk | |
95 | and | |
96 | .I vm_oublk | |
97 | These numbers account only for real | |
98 | i/o; data supplied by the caching mechanism is charged only | |
99 | to the first process to read or write the data. | |
100 | .SH SEE ALSO | |
3311b706 | 101 | time(2), wait3(2), getrusage(2) |