checking memory and cpu consumption of procs

[Dave Viner]

Hi Ton,
	I don't think I currently have access to a Solaris machine, but I'll try to
ask some folks I know who do solaris development.  I think using poll() or
select() or something like that can provide functionality that the
spopen()/fgets() strategy can't.  In particular, imagine code that uses the
spopen()/fgets() model and the popen_timeout_alarm_handler().  The command
that is executed doesn't output anything to STDOUT, but spews lots of error
messages to STDERR.  Since the first fgets() call blocks on STDOUT, the
whole plugin just times out and the only thing reported is from the SIGALRM
saying the plugin timed out.  Using a poll() or select() model instead, the
plugin can capture all output from STDOUT _and_ STDERR simultaneously.  Then
if any timeouts happen, at least there was a chance to see some activity and
take some action.  Does that make sense?  Let me know what you think about
this as a model of plugin invocation.

Thanks
dave




-----Original Message-----
From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net]On Behalf Of Voon, Ton
Sent: Friday, December 20, 2002 6:08 AM
To: 'Dave Viner'; nagios-users at lists.sourceforge.net
Subject: RE: [Nagios-users] checking memory and cpu consumption of procs


Dave,

I've tried to run your program on Solaris but I'm not having any joy. I
managed to add in the poll checks for configure, but when running, it goes
into an infinite loop. It seems that the line:

n = poll (fdarray, 2, INFTIM);

is returning 2, but the condition

(fdarray[0].revents & readable)

is not true and so the read_size never gets set to 0 and the loop never
ends.

I don't know if this is a Solaris limitation (uname: SunOS 2.6).

Is there any particular reason you wanted to use poll? I think for a simple
subcommand, the spopen and fgets used in check_procs is probably sufficient.

Ton

> -----Original Message-----
> From:	Dave Viner [SMTP:dviner at yahoo-inc.com]
> Sent:	Thursday, December 19, 2002 6:00 PM
> To:	Voon, Ton; nagios-users at lists.sourceforge.net
> Subject:	RE: [Nagios-users] checking memory and cpu consumption of
> procs
>
> Here's my first stab at a check_cpu.c program.  I want to use poll() to
> watch both stdout and stderr of the child process, but I can't get it to
> compile on both FreeBSD and Linux.  FreeBSD just needs:
> 	#include <poll.h>
> but Linux needs:
> 	#include <sys/poll.h>
> 	#include <asm/poll.h>
>
> Unfortunately this means that it requires a new definition in
> configure.in.
> I'm not quite sure how to handle that, but I'll also look into make those
> changes.  Can anyone help me with that?
>
> Other than that, this program works very well (I think).
>
> thanks
>
> dave
>
> -----Original Message-----
> From: nagios-users-admin at lists.sourceforge.net
> [mailto:nagios-users-admin at lists.sourceforge.net]On Behalf Of Dave Viner
> Sent: Wednesday, December 18, 2002 9:38 AM
> To: Voon, Ton; nagios-users at lists.sourceforge.net
> Subject: RE: [Nagios-users] checking memory and cpu consumption of procs
>
>
> I'll make one for FreeBSD and Linux.  I'll post it to the list when I have
> it ready.  Unforunately, I don't really understand autoconf/automake and
> configure.in/makefile.am, so I don't know that I'll be able to help much
> there....
>
> Thanks !
>
> dave
>
>
> -----Original Message-----
> From: Voon, Ton [mailto:Ton.Voon at egg.com]
> Sent: Wednesday, December 18, 2002 1:33 AM
> To: 'Dave Viner'; Voon, Ton; nagios-users at lists.sourceforge.net
> Subject: RE: [Nagios-users] checking memory and cpu consumption of procs
>
>
> A check_cpu, based on check_vsz, would be useful. However, it would
> require
> quite a few non-trivial changes to the configure.in and makefile.am to
> pick
> up various flags for the ps command to make it portable. If you want to
> make
> a start, I'd be happy to add in other OSes.
>
> > -----Original Message-----
> > From:	Dave Viner [SMTP:dviner at yahoo-inc.com]
> > Sent:	Tuesday, December 17, 2002 6:23 PM
> > To:	Voon, Ton; nagios-users at lists.sourceforge.net
> > Subject:	RE: [Nagios-users] checking memory and cpu consumption of
> > procs
> >
> > Hi,
> >
> > Thanks for pointing me to check_vsz.  This is a really great utility.
> > From
> > looking at the usage message and the code itself, it looks to me like
> this
> > monitors virtual memory consumption.  Are there any hooks to monitor
> %cpu
> > consumption ?  Perhaps something like
> > 	ps waxco 'vsz %cpu command'
> > ?  I'm happy to try to add this in if it sounds useful.
> >
> > dave
> >
> > -----Original Message-----
> > From: Voon, Ton [mailto:Ton.Voon at egg.com]
> > Sent: Tuesday, December 17, 2002 1:31 AM
> > To: 'Dave Viner'; nagios-users at lists.sourceforge.net
> > Subject: RE: [Nagios-users] checking memory and cpu consumption of procs
> >
> >
> > Dave,
> >
> > Take a look at check_vsz for the virtual size of memory usage on a
> process
> > level. I've put lot of functionality patches on sourceforge, so you'll
> > need
> > to apply those.
> >
> > Ton
> >
> > > -----Original Message-----
> > > From:	Dave Viner [SMTP:dviner at yahoo-inc.com]
> > > Sent:	Tuesday, December 17, 2002 6:56 AM
> > > To:	nagios-users at lists.sourceforge.net
> > > Subject:	[Nagios-users] checking memory and cpu consumption of procs
> > >
> > > Hi,
> > > 	I want to ensure that no process on a machine consumes more than x %
> > > of the
> > > cpu, and y MB memory.  Is there an existing plugin that handles this?
> I
> > > saw
> > > that check_procs will monitor the number of processes on a machine
> > > (including ones that match a certain name), and check_load will
> examine
> > > the
> > > machine's overall load averages as reported by uptime.  But I can't
> seem
> > > to
> > > find anything that monitors cpu consumption or memory consumption.  Is
> > > there
> > > a plugin for this already?
> > >
> > > thanks
> > > dave
> > >
> >
> >
>


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