[d2n-analysis-talk] BigBite Farm Replay: MWDC variables

[Brad Sawatzky]

I'd say drop them.  We can always replay if we find a need later.

Unless, of course, someone tells us that the MWDC calibrations are not
yet complete.  I'm assuming here that the ratio of track/no-track events
is resonable and comparible to, say, GEn performance.

Matt:  Can you confirm?  (I know we looked at this in the past, and I
think we're OK; but it is an important issue to verify.)

-- Brad

On Sat, 04 Dec 2010, Diana Parno wrote:

> I ran a test of the farm replays with the modified .odef file I sent
> to the list last night. Much to my surprise, the result was an
> additional factor-of-3 reduction in file size (on top of the factor-
> of-4.5 reduction from cutting out events with no tracks). My fully
> replayed sample run, 2024, now takes up only 2.6 GB of disk space in
> root files. (Before the above changes, it occupied 30.7 GB.)
> 
> I've now investigated this result, and I believe that the main source
> of file size reduction is that the BB.mwdc.* block is no longer being
> written to the root files. This block represents 628 branches, and the
> majority of these are arrays, so they do take up quite a lot of room.
> 
> This level of reduction in file size would go a very long way in  
> solving our immediate space problems. Before moving forward and  
> submitting these jobs to the farm, though, I want to make sure this is  
> a sensible step. Are the MWDC calibrations currently in a finished  
> state, or do we expect to need these MWDC files for a wide range of  
> BigBite runs? If the latter, are there particular variables we expect  
> to need (so that we can strip out the others), or do we require the  
> whole kit and caboodle? Matt, I think you're the MWDC expert, so I'm  
> especially hoping you can weigh in.
> 
> Best,
> Diana
> 
-- 
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
The most exciting phrase to hear in science, the one that heralds new
  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov