01-10-2002
"Page faults" is a number that includes too many things to be very useful. I'm surprised that your vmstat bothers to display the number, although I see
here that it does. Look instead at the page out rate (label=pout). If this number is high, that's your problem. Note that it is zero on the man page. Any non-zero number is not real good. And the higher the number, the worse it is.
Most versions of unix these days allocate just enough stack to store the environment and the arguments and then let the process page fault its way into memory. Does NT load the entire process into memory at start-up time?
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LEARN ABOUT ULTRIX
vtimes
vtimes(3) Library Functions Manual vtimes(3)
Name
vtimes - get information about resource utilization
Syntax
vtimes(par_vm, ch_vm)
struct vtimes *par_vm, *ch_vm;
Description
This facility has been superseded by
The routine 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 /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 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. The vm_idsrss integrates data and stack segment usage, while vm_ixrss integrates text segment usage.
The 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 Also
wait3(2), time(3)
vtimes(3)