• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT
    Make New Entry, Make Followup Entry

    User name R. Michaels

    Log entry time 06:46:53 on November19,2010

    Entry number 340761

    keyword=ET params adjusted, try to smoothen deadtime

    Alex was doing some test running the DAQ from dvcsdaq2 using
    local disks (run 8890) and said the deadtime fluctuations were
    the same. This means that changing computers won't help.

    There is something else we can try: adjusting ET parameters.
    The args for et_start were 800 and 80000. We realize the
    max event size is 54K, so we make these params 1600 and 60000
    in hopes of more efficient buffering. The 1st param is the
    number of events in ET, the 2nd is the max size of events,
    and the product [now 96 Mbyte] should fit within the available
    memory of adaql2, else memory swapping.

    Run 8891 started this way. But after a few mins we see the DT
    fluctuations again. We could play more with parameters but it
    doesn't seem useful.