VEGAS Pulsar Project Meeting: 2016 January 11th 2:00 - 3:00pm ET
VEGAS Pulsar Project Meeting: 2016 January 11th 2:00 - 3:00pm ET
Room / Connection Details
Housekeeping Details
Resource Allocations
Present
Agenda
BOF file status updates
Software
GBT testing
Wideband AP
VEGAS/DIBAS-style backend for FAST
Multicasting for spectral line and pulsar modes
Resource Allocations for next quarter
Date / Time of Next Meeting
Room / Connection Details
GB-137 / Soc 280
192.33.117.12##7144
434-817-6443
Housekeeping Details
Main wiki page
gbsapp Mailing List
Location and regular date and time of meeting - agreed weekly on Mondays; GB-137 / Soc-280; 2-3pm ET
ETK codes:
Electronics: 432510.GB3015
Software: 893252.GB3015
Science: 432540.GB3015
Resource Allocations
BLOSS, MARTIN ALAN
0.05
CREAGER, RAY
0.50
DEMOREST, PAUL
0.05
RICHMOND-DECKER, JUSTIN
0.70
FORD, JOHN M
0.05
MCCULLOUGH, RANDY L
0.50
RAY, JASON
0.10
PRESTAGE, RICHARD
0.05
LYNCH, Ryan
0.15
VAN TONDER, VEREESE
0.20
Present
Randy
Justin
Ray
Richard
Paul
Marty
Agenda
BOF file status updates
c1500x4096 mode
Recompiled GPU transpose code
Complete
nVidia profiling
Likely not complete
BLI found using packet-sockets solves this problem and found them highly efficient. That code is done and available.
guppi_daq_server version comparisons
Justin to test for performance differences
Is this the SS version?
c1500x0512 mode
Build status
Built successfully
Scans failing during long integrations
Update status shared memory code to use different data type to accurately capture packet ID
only for displaying packet, does not solve failure
Cause of failure is not yet determined
difficult to reproduce
Needs a lead
Justin to talk to Ryan
Astronomical verification
Used successfully during Breakthrough Listen tests (though with some packet loss in the RAW mode)
Packet loss problem now solved using the BLI packet-socket code
Is this the SS version?
c1500x2048 mode
inability to build off of c1500x4096
still have not determined cause
looking at block-level designs to localize issues
Is this the SS version?
Fix for nchan calculation in coherent modes
verified - ready to roll into other modes
Bandpass issues in i0800x0064, 0128, 8192
Spent some time testing 64 channel mode
Tone shows up in the correct bins, but generates spurs if injected at Fs/8 or nearby
Spurs move with the test tone and decrease with amplitude if you move away from Fs/8
May be problem with MMCM or OGP calibration
Update on calibration
A suggestion was made to build a BOF with digital noise source to test
tough for 8192, others should be ok
test w/ 64 chl mode since testing already done by Jason
work needs to prioritized against other work
Duplicated signal in i0800x8192
Unknown by attendees if any work has been done
Related to above issue
Low bandwidth modes
New filter coefficients
Spectrum output instead of time series
Implement PFB code
Could single GPU keep up with coherent dedispersion?
Reviewed John's email suggestion with Paul - more detailed query with John recommended
Is there an advantage to FFTs in FPGA? (none identified)
GPU (S/W) vs. FPGA (H/W)
GPU likely preferable if it can handle it
requires a benchmarking test
existing FPGA filter work could be affected
S/W CUDA-savvy resource constrained
Justin will look at it
How about running a higher bandwidth modes and ignoring some of the spectra?
limits on number of channels likely an issue
Software
Configtool changes
Status of rebasing on current release version
after next M&C Release
dual backend code added but not system tested
Justin to test on next maintenance day
GBT Status shared memory parameters in PSRFITS headers
Done and seems to be working well
Switching signal generation
Cal successfully controlled by VEGAS
Actual swper still not matching requested swper
Status of calculation of actual swper
no progress/solution not clear
Matrix HPC
built compliance for all threads in Guppi Dac Server
some require additional work
GBT testing
No updates
Wideband AP
Status of new filters
on order, delayed by ITAR issues, now resolved
Due in ~ 3wks
Populating circuit boards with other parts
Any other updates
VEGAS/DIBAS-style backend for FAST
John and Richard met with Tony B and Karen on Dec 22
Updates from that meeting
No response to email asking FAST to send request to T. Beasley
Multicasting for spectral line and pulsar modes
Modifications to ROACH configuration and net task must bind to a multicast group instead of a specific host
All the 10-gig addresses on the ROACH would be multicast groups, and config will be told which to bind to
Some changes to net task code (in VEGAS HPC and guppi_daq code) to initialize sockets
Resource Allocations for next quarter
See above
Date / Time of Next Meeting
January 18
--
RyanLynch
- 2015-12-30
--
MartyBloss
- 2016-01-12
This topic: CICADA
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Topic revision:
2016-01-12,
MartyBloss
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