06-11-2007
Which is faster? Reading from file or 'ps'
Hi There...
I have an application which starts up many different processes under different names and I'm creating a script to tell me which processes are running (approx 30 different processes). To do this, I parse the results of a ps -u $USER.
My question is, will my script be faster if I run this ps statement each time and parse it or if I run the ps just once, storing the contents into a file, and then parsing the contents of the file?
I don't need my script to give real time results (I will be running it only 3-4 times a day) so I just need to know which method is faster.
Also, while on this topic, is there any way I can check the speed of execution of my script?
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LEARN ABOUT SUSE
killall5
KILLALL5(8) Linux System Administrator's Manual KILLALL5(8)
NAME
killall5 -- send a signal to all processes.
SYNOPSIS
killall5 -signalnumber [-o omitpid[,omitpid..]] [-o omitpid[,omitpid..]..]
DESCRIPTION
killall5 is the SystemV killall command. It sends a signal to all processes except kernel threads and the processes in its own session, so
it won't kill the shell that is running the script it was called from. Its primary (only) use is in the rc scripts found in the /etc/init.d
directory.
OPTIONS
-o omitpid
Tells killall5 to omit processes with that process id.
NOTES
killall5 can also be invoked as pidof, which is simply a (symbolic) link to the killall5 program.
EXIT STATUS
The program return zero if it killed processes. It return 2 if no process were killed, and 1 if it was unable to find any processes
(/proc/ is missing).
SEE ALSO
halt(8), reboot(8), pidof(8), killproc(8)
AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl
04 Nov 2003 KILLALL5(8)