02-06-2007
If you check the manual page for prstat you will see that besided a lot of options there are 2 optional arguments for prstat.
These arguments are:
interval (interval in seconds between 2 statistics reports)
count (Number of statistics reports)
So you could use:
prstat 2 5
Make 5 statistics reports with an interval of 2 seconds
prtstat 3
Make endless statistics report with an interval of 3 seconds.
prstat 0 1
Make 1 statistics report with an interval of 0 seconds (The interval is irrelevant here and can be any number, since it's only 1 report).
To process the output of prstat in a scriipt you have to limit the number of statistics reports. Without this limitation prstat would never end and your script with never proceeed.
You can redirect the limited number of statistics reports to some kind of file which you use later on in your script as source to extract/generate/manipulate or whatever.
If you do not which to redirect the output to a file but like to process the outut right away, by piping the output to another command, it would be easiest to start with a single statistics report. Once you know how to parse that kind of information e.g. with (n)awk you count increase the number of statistics reports. But no matter what, make sure the number of statistics reports is limited, or your script will never end.
There are ways to process a continious output stream of prstat, but shell scripting is not really suited for that. Basically you would have 2 programs and are dealing with IPC (Inter Process Communication).
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LEARN ABOUT MOJAVE
topsysproc
topsysproc(1m) USER COMMANDS topsysproc(1m)
NAME
topsysproc - top syscalls by process name. Uses DTrace.
SYNOPSIS
topsysproc [-Cs] [interval [count]]
DESCRIPTION
This program continually prints a report of the number of system calls by process name, and refreshes the display every 1 second or as
specified at the command line. Similar data can be fetched with "prstat -m".
Since this uses DTrace, only users with root privileges can run this command.
OPTIONS
-C don't clear the screen
-s print per second values
EXAMPLES
Default output, 1 second updates,
# topsysproc
Print every 5 seconds,
# topsysproc 5
Print a scrolling output,
# topsysproc -C
FIELDS
load avg
load averages, see uptime(1)
syscalls
total syscalls in this interval
syscalls/s
syscalls per second
PROCESS
process name
COUNT total syscalls in this interval
COUNT/s
syscalls per second
NOTES
There may be several PIDs with the same process name.
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
topsysproc will run until Ctrl-C is hit.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO
dtrace(1M), prstat(1M)
version 0.90 Jun 13, 2005 topsysproc(1m)