Hi Present were: Bhavesh, Elo, Erik, Frank, Gwyneth, Ian H., Peter, Roberto, Steven, and Vassili
Status on KNLs Some independently developed optionlists exist, but none are production-ready: - Erik's optionlist on Cori: in branch in simfactory2 - Frank will put his option list into simfactory. - Eloisa has one for Marconi + KNL, and will also put it in simfactory. Test suites and Jenkins: - Erik: optimizations on "jenkins" use optimization, performance difference ~8% - discussion about - whether to use optimizations or not / whether 8% are ok to loose - whether optimizations "dangerous" or not. - result for now: try to see if testsuites are broken and fix, if possible. - Eloisa will look at boostedpuncture test case - Roland will look at Spec test suites - Frank &| Roland will have a look at the hydro failure Piraha CST parsing (Stev): - caching parse-tree cuts down time practically to 0 - files holding cache (one per ccl file) will be within configurations - plan: new ticket, branch, eventually inclusion - parallelism problematic with Perl, but may not be needed anyway Gwyneth asked: - Constraints: what/how to use to calculate?- ML_AMD_Contstraints: uses ADM constraints, independent of evolution system
- McLachlan: uses BSSN variables, no need to calculate ADM variables
result: It does (and should) not really matter.
Preferences for one or the other exist, and may depend on
particular simulation specifics, but both should get the results
to within numerical accuracy.
- What thorn to use for which output type (basic/scalar/ascii)
(Frank: It would probably be good to have this as overview on a page or so.)
- Question about comment in bbh gallery example par file:
"SummationByParts::sbp_upwind_deriv": not required for that parameter file
would drop order of derivatives near boundary in some cases, but
derivatives are not used here
- ADMMass: how to measure
- using initial data output (but that might differ from the one on the finite
comp. grid)
- ADMMass thorn: surface integral or
- ADMMass thorn: volume integral (but needs thorn not in the toolkit to
excise BHs) or
- QuasiLocalMeasures: surface integral
- time refinement factors on coarse grids
- Stricter requirements on time step on very coarse grids than regular cfl
factor may
lead to instabilities (gauge evolution in particular).
- Result: don't need to use if no instability seen.
Frank
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