vtimes(3c)
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vtimes
get information about resource usage
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SYNTAX
vtimes(parvm, chvm)
struct vtimes *parvm, *chvm;
DESCRIPTION
Vtimes returns accounting information for the current process and
for the terminated child processes of the current process.
Par_vm, ch_vm, or both may be 0, in which case only the
information for non-zero pointers is returned.
After the call, each buffer contains information as defined by
the contents of the include file /usr/include/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 100ths of a second. The vm_idrss and vm_ixrss
measure memory usage. They are computed by integrating the
number of memory pages in use over CPU time. They are reported
as though computed discretely, adding the current memory usage
(in 2048 byte pages) each time the clock ticks.
For example, if a process used five main memory pages over one
CPU-second for its data and stack, then vm_idsrss would have the
value 5*100, where vm_utime+vm_stime would be the 100. 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
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vtimes(3c)
count.
The vm_majflt field gives the number of page faults that 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 that 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.
FILES
/usr/lib/libproto/lib3c.a
SEE ALSO
time(2), ftime(3C), wait3(2)
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