Nmon data collection blues

looseCannon · 11-09-2004, 10:00 AM

I've been playing around with nmon in the data collection mode, not the interactive one. The problem I'm having is it's not running for extended periods of time. For example :

Code:

nmon64 -F $HOME/tmp/`hostname`.`date +%Y%m%d%H%M`.nmon -t -r `hostname` -s10 -c8640 &

should collect a full days worth of information at 10 second slices. But when I kick this off it immediately stops. Now, it could be, and probably is, that I'm doing something wrong here. But, even using the example provided in the help (nmon64 -h) I get the same behavior.

Stumped. Confused. Perplexed.

HELP!!!

Matir · 11-09-2004, 10:59 AM

Does it give no error message?

looseCannon · 11-09-2004, 11:04 AM

No errors. Just stops. If I send it to the background I'll get the classical "Done" message if I hit enter right after I issue the command.

zorba4 · 11-10-2004, 04:35 AM

Remember that the nmon collected data should have less than typycallly 300. This means that your collection interval should be about 5 minutes, and not 10 seconds if y ou want to use the collected data.
The following command line works for me, it's in a script I start with nohup :
nmon32 -F ../logs/myfile.nmon -r mytest-s30 -c400
You see that I use nmon32 because I have a 32 bits toy for playing today, but this syntax should also work with nmon64 on your system.

looseCannon · 11-10-2004, 07:28 AM

It seems real weird, the way this works. Contrary to the way most other scripts and programs work when they run. When I kick it off it, somehow, magically backgrounds itelf, possibly spawns some child processes, and the parent process disappears. Yet, the file that I tell it to write to still gets written to. An hour later, I've got an hours worth of data.

zorba4 · 11-11-2004, 05:52 AM

You know what ? I'm happy !
We do have a working script.
I wa very tired when I wrote this script, so I dropped almost anything in it.
We don't really know why, but it works.
So, let's use it, and let's wait until we happen to learn why it works.