11-08-2014
In this case what you monitor is typical behavior. Given a normal bandwith of number of process (which needs to be tuned for the system), you may want to be informed or warned if there are suddenly an x percentage more than usual and maybe get a critical message if the number of processes exceeds yet another treshold.
It may indicate a problem that perhaps can be corrected before the system runs out of CPU or typically memory (or bump into another limit like a kernel parameter that prevents new processes from getting started). Another thing is that if the system runs out of CPU or memory, this metric will provide you with additional information that may help you determine the nature of a problem...
Last edited by Scrutinizer; 11-08-2014 at 10:53 AM..
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times(2) System Calls Manual times(2)
NAME
times - get process and child process times
SYNOPSIS
DESCRIPTION
fills the structure pointed to by buffer with time-accounting information. The structure defined in is as follows:
struct tms {
clock_t tms_utime; /* user time */
clock_t tms_stime; /* system time */"
clock_t tms_cutime; /* user time, children */
clock_t tms_cstime; /* system time, children */
};
This information comes from the calling process and each of its terminated child processes for which it has executed a or The times are in
units of 1/seconds, where is processor dependent. The value of can be queried using the function (see sysconf(2)).
is the CPU time used while executing instructions in the user space of the calling process.
is the CPU time used by the system on behalf of the calling process.
is the sum of the and of the child processes.
is the sum of the and of the child processes.
RETURN VALUE
Upon successful completion, returns the elapsed real time, in units of 1/of a second, since an arbitrary point in the past (such as system
start-up time). This point does not change from one invocation of to another. If fails, (clock_t) -1 is returned and is set to indicate
the error.
Remarks
has a granularity of one tick. Processes which run less than one tick may not register any value.
ERRORS
fails if buffer points to an illegal address. The reliable detection of this error is implementation dependent.
WARNINGS
Not all CPU time expended by system processes on behalf of a user process is counted in the system CPU time for that process.
SEE ALSO
time(1), exec(2), fork(2), gettimeofday(2), sysconf(2), time(2), wait(2).
STANDARDS CONFORMANCE
times(2)