Martin, I have been missing this kernel info too. I wrote some of my own custom Ganglia disk IO metrics that are 'per-partition' just like iostat. I get the data from /proc/partitions but so far I have been unable to calculate "%wait" for a partition (percentage of elapsed time wait queue was not zero). I really want this on Linux so my stats are consistent with Solaris.
---- Yemi > -----Original Message----- > From: Martin Knoblauch [mailto:[EMAIL PROTECTED] > Sent: Tuesday, May 25, 2004 1:30 PM > To: ganglia-developers@lists.sourceforge.net > Subject: [Ganglia-developers] RFC: IO-Wait CPU metrics for > all platforms > > Hi, > > the 2.6.x Linux kernel exports statistics on the amount of > time that the CPU is waiting for I/O operations. I think it > would be useful to monitor this with gmond. In the minumum > case we probably have to retrieve it and add it to the idle numbers. > > From the other platforms only HP-UX and Solaris report the > IO-wait cycles. Unfortunatelly under different names :-( > > My proposal would be to: > > - monitor IO-wait for "all" platforms. If the platforms don't > have it, just report "0" > - report it under the same name on all platforms > > My reason for the "all platform" metrics is to allow it into > the webfrontend CPU report graph. We already do it for > "nice", which is not exported by all platforms. > > I would volunteer to write the stub routines for all > platforms and to modify the webfrontend. > > Comments? Am I out of my mind? The major drawback is that it > adds some kind of incompatibility to pre-2.6 code. On the > other hand 2.6 is the "right" place to do it. > > Cheers > Martin > > ===== > ------------------------------------------------------ > Martin Knoblauch > email: k n o b i AT knobisoft DOT de > www: http://www.knobisoft.de > > > ------------------------------------------------------- > This SF.Net email is sponsored by: Oracle 10g Get certified > on the hottest thing ever to hit the market... Oracle 10g. > Take an Oracle 10g class now, and we'll give you the exam FREE. > http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click > _______________________________________________ > Ganglia-developers mailing list > Ganglia-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ganglia-developers >
