On Tue, 12 Oct 2010 21:09:31 +1100 (EST), nathans wrote:
nathans> So, thats 744 kernel metrics out of the box, the set grows
nathans> if you make use of cgroups, and some kernel metrics are in
nathans> separate PMDAs - infiniband, Lustre, etc.
Looking at collectl's use of perquery reminds me of the time a few
years ago when IB pmda was in nappies.
BTW, Nathan, why are network.ib metrics in root_linux?
>> I've included some samples below of the kind of information that I'm
>> gathering and plotting now:
>>
>> http://www.msi.umn.edu/~mark/msica/mirror_20090928-20100927.png
>> http://www.msi.umn.edu/~mark/msica/2GB-block_64MB_directIO_posix_nocache.png
nathans> Interesting stuff.
Those "kites" - what are they trying to show?
nathans> We've spoken about heat maps before and its an area of
nathans> interest for some - the native PCP charting tool, pmchart,
nathans> doesn't support heatmaps at this time, but Qwt on which it
nathans> is built does ... so its a Simple Matter of Coding to add
nathans> that functionality into pmchart - I'm interested in seeing
nathans> someone tackle that and attempt to solve it in a generic way
nathans> (i.e. heatmaps for arbitrary metrics & completely runtime
nathans> configurable like the other chart types there).
I've been looking at possible ways to use what Qwt call "spectrogram"
and given current set of PCP metric types (counter or discrete) I'm
struggling to find a use which makes sense for a single metric
cases. It could make sense for metrics which are used to encode
histogram buckets but there are a few of them in the system's pmdas. I
guess it could be argued that if someone builds it "they" will come -
right now PCP really doesn't have a good way to display histograms.
max
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