VEGAS Team Meeting

October 21, 2013

Attendees

CALTECH, UC-B, & Columbia

Dan

NRAO:

Marty, Anish, Richard, Mark. Jason, John, Joe, Paul, Amanda, Randy

Agenda:

  • Testing
  1. Plans for stand-alone testing (no GBT M&C) for modes 5 and up by Anish and the Berkeley team – who and when?
  2. Need to fix Mode 2 and 3 glitches in spectrum
  3. Need to fix memory locking, core pinning, network tuning
  4. Shared observing strategy

DIBAS Issues, maybe affects VEGAS:

  1. Mode2/3 spectra - artifacts every 1/8 band.
  2. TCPBorphServer ARP Spamming - resolved with IP/MAC list and config file. Is this the long term solution?
  3. 16K BOF at low frequency has low sampling frequency effects not see at high frequency.
  4. Problem setting values - VALON related. Fixed?
  5. GPU initialization is slower than expected. Is performance acceptable?
  6. DIBAS process control. Fixed?

  • Old Business

Meeting Notes:

  • Testing
  1. Plans for stand-alone testing (no GBT M&C) for modes 5 and up by Anish and the Berkeley team – who and when?
    • Determine mode testing status (Anish)
      • Mode test 5 passed engineering tests, but not tried for commissioning
      • Mode 6 needs software adjustments before continuing
      • Anish will talk with Glenn about tests that use Thursday test time
  2. Need to fix Mode 2 and 3 glitches in spectrum
  3. Need to fix memory locking, core pinning, network tuning
    • Need to make similar adjustments to the VEGAS environment
    • Will make information about changes available to overall group

DIBAS Issues, maybe affects VEGAS:

  1. Mode2/3 spectra - artifacts every 1/8 band.
    • Glenn to address
  2. TCPBorphServer ARP Spamming - resolved with IP/MAC list and config file. Is this the long term solution?
    • Workaround is permanent - requiries care when changing network cards
    • Reported to S.African team who have no plans to fix.
  3. 16K BOF at low frequency has low sampling frequency effects not see at high frequency.
    • Built one for 600 that should suffice
  4. Problem setting values - VALON related. Fixed?
    • Yes
  5. GPU initialization is slower than expected. Is performance acceptable?
    • Shows up intermittently in VEGAS
    • It did not appear to be a problem at SHAO
    • Install version 5.5 in VEGAS to match SHAO version
  6. DIBAS process control. Fixed?
    • Believe so
  7. Mode delivery strategy Updated 23-Oct
    1. Modes 1,2,& 3
      • Internal release 15-Nov.
    2. Modes 4-9
    3. Mode 20
    4. Modes 10-19
  8. Shared observing strategy (from August 2013)
  • All 9 of the “priority” modes will be fully commissioned before any VEGAS science observing will commence. At that point the Green Bank support staff will be briefed and a plan put in place to allow science on all VEGAS modes, with careful communications during that period so that the remaining 18 “derivative” modes could be commissioned by external projects (with back-up plans in place to use the fully commissioned modes if there are problems with any of the derivative modes).

  • Old Business

Other items:

Next Teleconference: October 28, 2013 .

-- MartyBloss - 2013-10-21

This topic: CICADA > WebHome > GreenBankSpectrometer > CICADAVegasProjectMeetings > VEGASTeamMeetin21October2013
Topic revision: 2013-10-23, MartyBloss
This site is powered by FoswikiCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding NRAO Public Wiki? Send feedback