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opacs/monitoring/data analysis
Hello again
About monitoring and the "o" packages.
I am involved in the monitoring of the
NA48 experiment. It is clear that the
histogramming/plotting that I have in opacs v1
has to be improved to have a flexible system.
In v2 I modify the Ho, Xo packages, add some
osh commands to be able to handle histogram, plots
in a more convenient way. In fact we are quite close
of what offer PAW to do interactive analysis.
The architecture of what people want for NA48
is the following :
- having some front end processes on some front
end machines that receive burst of events and
that book/fill histograms according to
physicists wishes.
- after filling (maily at the end
of a burst processing) histos are sent over the
net to an accumulation task that :
- create an OHistogram when an
unknown histo is coming.
- add the content of the incoming histo to the
existing coresponding OHistogram if already created.
- some visualisation tasks (built with Wo/osh),
started from anyway, are able to contact the accumulation
task to ask :
- the list of known histograms.
- do interactive selection in the list with an
histogram chooser.
- ask a list of histograms to the "acc" task.
- display (with grid of XoPlotter widgets) the
received histograms.
- do fit if necessary.
- define interactivly some "panels" of predefine
configuration of histo/plots.
The communications are handle by the Cm package
written by C.Arnault (author of Ci).
In fact we have a prototype running over opacs v2
without any NA48 code. If you are interested to get it,
let me know, I will do a distribution.
Guy Barrand
barrand@lal.in2p3.fr