VTIMES(3C)VTIMES(3C)NAMEvtimes - get information about resource utilization
SYNOPSIS
#include <sys/vtimes.h>
vtimes(par_vm, ch_vm)
struct vtimes *par_vm, *ch_vm;
DESCRIPTION
This facility is superseded by getrusage(2).
Vtimes returns accounting information for the current process and for
the terminated child processes of the current process. Either par_vm
or ch_vm or both may be 0, in which case only the information for the
pointers which are non-zero is returned.
After the call, each buffer contains information as defined by the
contents of the include file <sys/vtimes.h>:
struct vtimes {
int vm_utime; /* user time (*HZ) */
int vm_stime; /* system time (*HZ) */
/* divide next two by utime+stime to get averages */
unsigned vm_idsrss; /* integral of d+s rss */
unsigned vm_ixrss; /* integral of text rss */
int vm_maxrss; /* maximum rss */
int vm_majflt; /* major page faults */
int vm_minflt; /* minor page faults */
int vm_nswap; /* number of swaps */
int vm_inblk; /* block reads */
int vm_oublk; /* block writes */
};
The vm_utime and vm_stime fields give the user and system time
respectively in 60ths of a second (or 50ths if that is the frequency of
wall current in your locality.) The vm_idrss and vm_ixrss measure
memory usage. They are computed by integrating the number of memory
pages in use each over cpu time. They are reported as though computed
discretely, adding the current memory usage (in 512 byte pages) each
time the clock ticks. If a process used 5 core pages over 1 cpu-second
for its data and stack, then vm_idsrss would have the value 5*60, where
vm_utime+vm_stime would be the 60. Vm_idsrss integrates data and stack
segment usage, while vm_ixrss integrates text segment usage. Vm_maxrss
reports the maximum instantaneous sum of the text+data+stack core-
resident page count.
The vm_majflt field gives the number of page faults which resulted in
disk activity; the vm_minflt field gives the number of page faults
incurred in simulation of reference bits; vm_nswap is the number of
swaps which occurred. The number of file system input/output events
are reported in vm_inblk and vm_oublk These numbers account only for
real i/o; data supplied by the caching mechanism is charged only to the
first process to read or write the data.
SEE ALSOtime(2), wait3(2), getrusage(2)4th Berkeley Distribution May 12, 1986 VTIMES(3C)
