What is an Ntuple anyway?
Do we really need to refresh ~200 GBytes of Ntuples “continuously” ?
The Ntuple is what we use for interactive histogramming.
- If it takes one hour to get the histogram, may very well submit a job and get the histograms back.
- Data transfer is limited, it makes no difference where the job runs !
- An Ntuple is a data-set you go through in a few minutes at most
disk ? CPU: 50 Mbytes/sec at most ? 3 GBytes/min at most.
Ntuple will always fit in your desk(lap)top PC !
- Notice: Run I equivalent (200MByte) required good chunk of 5” big SCSI disk !