Last update:
Apr 1, 2000
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An Online Reconstruction CPU Farm for the BLAST Experiment
at MIT-Bates Lab
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Timothy Paul Smith1,
Ben Yoder2
- Massachusetts Institute of Technology - Bates Lab
- Massachusetts Institute of Technology
Presented by:
Timothy Paul Smith
The BLAST detector and experimental program at MIT-Bates Lab will
start to take data in early 2001. The analysis of the raw data is
complicated by the large acceptance, the non-homogeneous magnetic
field and the 500 to 1000 real event rate. Yet an online
reconstruction gives the experimentalist a handle on the status
of the polarized target, the detectors and overall experiment.
Therefore, we are constructing an online reconstruction CPU farm.
In the prototype we used 50 Linux CPUs and analysised 20 million
Monte Carlo events at a rate of 1500 event per second. In the
next stage we are analyzing data from the partially instrumented
BLAST detector. The key to the farm is a data server which buffers
the raw data and server it to the analysis CPUs via sockets. It
then collects back the results and also maintains histograms of
raw and analyzed data. Since there are a number of time dependent
experimental parameters, the correct sequence is vital. We can
also serve histograms of data or analysis to client-monitors.
Our client-server CPU farm performs well and we expect to be able
to handle the data from the full detector in just over a year.
Short Paper:  |
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