projects / unix-history / blame
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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 | .\" | |
| 5 | .\" @(#)vtimes.3 4.1 (Berkeley) %G% | |
| 6 | .\" | |
| 7 | .TH VTIMES 2V | |
| 8 | .UC 4 | |
| 9 | .SH NAME | |
| 10 | vtimes \- get information about resource utilization | |
| 11 | .SH SYNOPSIS | |
| 12 | .nf | |
| 13 | .B "vtimes(par_vm, ch_vm)" | |
| 14 | .B "struct vtimes *par_vm, *ch_vm;" | |
| 15 | .fi | |
| 16 | .SH DESCRIPTION | |
| 17 | .I Vtimes | |
| 18 | returns accounting information for the current process and for | |
| 19 | the terminated child processes of the current | |
| 20 | process. Either | |
| 21 | .I par_vm | |
| 22 | or | |
| 23 | .I ch_vm | |
| 24 | or both may be 0, in which case only the information for the pointers | |
| 25 | which are non-zero is returned. | |
| 26 | .PP | |
| 27 | After the call, each buffer contains information as defined by the | |
| 28 | contents of the include file | |
| 29 | .I /usr/include/sys/vtimes.h: | |
| 30 | .LP | |
| 31 | .nf | |
| 32 | struct vtimes { | |
| 33 | int vm_utime; /* user time (*HZ) */ | |
| 34 | int vm_stime; /* system time (*HZ) */ | |
| 35 | /* divide next two by utime+stime to get averages */ | |
| 36 | unsigned vm_idsrss; /* integral of d+s rss */ | |
| 37 | unsigned vm_ixrss; /* integral of text rss */ | |
| 38 | int vm_maxrss; /* maximum rss */ | |
| 39 | int vm_majflt; /* major page faults */ | |
| 40 | int vm_minflt; /* minor page faults */ | |
| 41 | int vm_nswap; /* number of swaps */ | |
| 42 | int vm_inblk; /* block reads */ | |
| 43 | int vm_oublk; /* block writes */ | |
| 44 | }; | |
| 45 | .fi | |
| 46 | .PP | |
| 47 | The | |
| 48 | .I vm_utime | |
| 49 | and | |
| 50 | .I vm_stime | |
| 51 | fields give the user and system | |
| 52 | time respectively in 60ths of a second (or 50ths if that | |
| 53 | is the frequency of wall current in your locality.) The | |
| 54 | .I vm_idrss | |
| 55 | and | |
| 56 | .I vm_ixrss | |
| 57 | measure memory usage. They are computed by integrating the number of | |
| 58 | memory pages in use each | |
| 59 | over cpu time. They are reported as though computed | |
| 60 | discretely, adding the current memory usage (in 512 byte | |
| 61 | pages) each time the clock ticks. If a process used 5 core | |
| 62 | pages over 1 cpu-second for its data and stack, then | |
| 63 | .I vm_idsrss | |
| 64 | would have the value 5*60, where | |
| 65 | .I vm_utime+vm_stime | |
| 66 | would be the 60. | |
| 67 | .I Vm_idsrss | |
| 68 | integrates data and stack segment | |
| 69 | usage, while | |
| 70 | .I vm_ixrss | |
| 71 | integrates text segment usage. | |
| 72 | .I Vm_maxrss | |
| 73 | reports the maximum instantaneous sum of the | |
| 74 | text+data+stack core-resident page count. | |
| 75 | .PP | |
| 76 | The | |
| 77 | .I vm_majflt | |
| 78 | field gives the number of page faults which | |
| 79 | resulted in disk activity; the | |
| 80 | .I vm_minflt | |
| 81 | field gives the | |
| 82 | number of page faults incurred in simulation of reference | |
| 83 | bits; | |
| 84 | .I vm_nswap | |
| 85 | is the number of swaps which occurred. The | |
| 86 | number of file system input/output events are reported in | |
| 87 | .I vm_inblk | |
| 88 | and | |
| 89 | .I vm_oublk | |
| 90 | These numbers account only for real | |
| 91 | i/o; data supplied by the caching mechanism is charged only | |
| 92 | to the first process to read or write the data. | |
| 93 | .SH SEE ALSO | |
| 94 | time(2), wait3(2) | |
| 95 | .SH BUGS | |
| 96 | This call is peculiar to this version of UNIX. | |
| 97 | The options and specifications of this system call are subject to change. | |
| 98 | It may be extended to include additional information | |
| 99 | in future versions of the system. |