Re: Upcoming BRAT changes

From: Flemming Videbaek (videbaek@sgs1.hirg.bnl.gov)
Date: Wed Dec 12 2001 - 22:17:14 EST

  • Next message: Bjorn H Samset: "Re: Another change prop. - BrVertexFilter"

    >
    > What do you think of the BrModule::Debug and BrModule::Info idea?
    >
    
    It looks good to me.
    
    > Ayway, I'll probably submit the changes Friday, baring no complains
    > from fellow collaborators.
    
    You probalky got most of the input you will get
    >
    
    > It's amassing how much time you have when you're waiting for data from
    > the quasi-stable CRS, especially when jobs get killed in the middle of
    > absolutly nothing.  Mind you, processing one 100K run with only the
    > TMA, SMA, and BB in takes about 10 min.  Seriously, the CRS is not at
    > all optimal, and I think implementing a schedular on top is a bloody
    > waste of time - RCF should provide that - and they should provide a
    > search engine for our mailing-list archives too!  Now, please!
    
    This two items has little to do with each other - so
    i) Attempting to read 100K events((~5Gb)  in about 10 min means you are
    pushing the HPSS system to its limit regardsless of the crs implementation .
    If you go through the numbers there is no way ANY set of nodes can be fed
    off tape at kept busy. If we do little analysis do not expect this to get
    done quickly. The stability is another matter, but as I understand it has
    less to do with the farm as with the socalled DCE problems related to one
    arm of IBM not being willing to share information with another !!
    ii) The list servers are NOT maintained by RCF, but by ITD, and do not
    expect a response from them. You can possible blame Brahms, but we also have
    to prioritize what is done- and itmes like DAQ, backups, and systems
    maintance is high on that list.
    
    regards
        Flemming
    



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