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Full Discussion: top command line utility
Top Forums Programming top command line utility Post 302146476 by LivinFree on Tuesday 20th of November 2007 07:38:23 PM
Old 11-20-2007
Well, if you insist on using top, double-check the man page. I found this in mine (shipped with GNU procps-3.2.7-8.1.el5):
Quote:
7. BUGS
Send bug reports to:
Albert D. Cahalan, <albert@users.sf.net>

The top command calculates Cpu(s) by looking at the change in CPU time values between samples. When
you first run it, it has no previous sample to compare to, so these initial values are the percent-
ages since boot. It means you need at least two loops or you have to ignore summary output from the
first loop. This is problem for example for batch mode. There is a possible workaround if you define
the CPULOOP=1 environment variable. The top command will be run one extra hidden loop for CPU data
before standard output.
Plus, rather than incur an even heavier load by invoking top, you could do as top does to get it's information; in my case it reads /proc/stat to get the CPU counters. Since you didn't reply with your OS, I don't know if this will work for you.

BTW, I'm not sure if you mean RTOS, but if you really need this to be real-time, I'd definitely minimize the impact of monitoring as much as possible.
 

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ENV(1)							    BSD General Commands Manual 						    ENV(1)

NAME
env -- set and print environment SYNOPSIS
env [-i] [name=value ...] [utility [argument ...]] DESCRIPTION
env executes utility after modifying the environment as specified on the command line. The option name=value specifies an environmental variable, name, with a value of value. The option '-i' causes env to completely ignore the environment it inherits. If no utility is specified, env prints out the names and values of the variables in the environment, with one name=value pair per line. EXIT STATUS
env exits with one of the following values: 0 utility was invoked and completed successfully. In this case the exit code is returned by the utility itself, not env. If no util- ity was specified, then env completed successfully and returned the exit code itself. 1 An invalid command line option was passed to env. 1-125 utility was invoked, but failed in some way; see its manual page for more information. In this case the exit code is returned by the utility itself, not env. 126 utility was found, but could not be invoked. 127 utility could not be found. COMPATIBILITY
The historic - option has been deprecated but is still supported in this implementation. SEE ALSO
execvp(3), environ(7) STANDARDS
The env utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). BUGS
env doesn't handle commands with equal (``='') signs in their names, for obvious reasons. BSD
June 8, 2007 BSD
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