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CasaParallelMinutes20110627
(2011-07-11,
JamesRobnett
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Casa Parallelization meeting minutes
Monday June 27th Room 317, 3:30pm MDT
Attendees: Kumar, James, Jeff, James, Jim, Sanjay
Targets/tasks for June 27th - July 10th
Give Kumar 3 MS, 16 spw, 16 time and 16spwsx2time domains
Jeff
3c147 in L band 8 hour observation set up by
Sanjay
Discussion/Agenda
No meeting next week
Examine async thread failure problem
Jim/James
Memory resident subtables may help
Move subtables to in memory storage rather than storage manager
Jim
In early testing stage
Discussion of whether it should go in casacore portion of MS or in visiterator
Suggested by Ger in favor of AIPSio storage manager
Work toward implementing streaming framework in applycal
Jim
deferred for subtable storage manager rework
Spectral imaging
Kumar
Parallelization status
Generates correct results
Performance issue putting images back together plane by plane is slow
Complete parallel user interface frame work
Jeff/Honglin
In testing: flagging, calibration seem to work
Confusion with respect to memory consumption in pcont
May get checked in this week
Slow scan selection fixed
Refine and distribute cluster scheduler interface
James
Re-addressing this week,
Parallel gridder status
Sanjay
Defer for now
Needs further optimization
on hold
Need 400+GB continuum case with complex field
Sanjay
3c147 in L band 8 hour observation set up by
Sanjay
Michel Brenjens may generate scheduling block
MS-MFS performance vs image size
James
Defer for now
Appears to be an L1-L2 cache issue on older systems (newer Nehalems have one cache line per core)
Consider other parallelization approaches
Test version of auto-flagging
Few weeks from suitable for testing here
Give Kumar 3 MS, 16 spw, 16 time and 16spwsx2time domains
Priorities based on 3.3 release plans
Parallel framework
BDF size independent filler aka streaming filler
Async I/O
Multims spectral, continuum imaging
auto-flagging
ARDG Targets
What is negative side effect of CVel in filler, non-reversible
What needs to be done to acceptably implement Auto-boxing with large number of channels
Broader parallelization of minor cycle for MS-MFS
--
JamesRobnett
- 2011-06-20
--
JamesRobnett
- 2011-07-11
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Topic revision: r1 - 2011-07-11,
JamesRobnett
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