VIATRA/DeveloperMeetingMinutes/Meeting20160915

Topics

Bugzilla status: VIATRA
TODOs from last week
- TODO finish CPS benchmark specification wiki page
- TODO Tutorial: Probably some links to EMF, VIATRA overview, etc. should be added
- TODO Aggregators
  - more test cases systematically for model changes
- TODO list industrial partners/projects on front page
Documentation:
- Gábor QBE https://bugs.eclipse.org/bugs/show_bug.cgi?id=495387
- Balázs: Local search https://bugs.eclipse.org/bugs/show_bug.cgi?id=501047
- Gábor: Aggregators https://bugs.eclipse.org/bugs/show_bug.cgi?id=501046
- Zoltán: Java types https://bugs.eclipse.org/bugs/show_bug.cgi?id=501048
- New and Noteworthy for 1.4: VIATRA/Releases/NewAndNoteworthy1.4 and VIATRA/Releases/MigrationTo1.4
Local search issues
- Performance benchmark
- Derived feature handling https://bugs.eclipse.org/bugs/show_bug.cgi?id=501395

Local search benchmark
- Measurement results: https://drive.google.com/drive/folders/0BxSC3bVi_TrSb1EyaV9rX3VPcmM
- A single, very expensive pattern (triggerPair) is responsible for 90% of execution time: https://github.com/viatra/org.eclipse.viatra.examples/blob/master/cps/transformations/org.eclipse.viatra.examples.cps.xform.m2m.batch.eiq/src/org/eclipse/viatra/examples/cps/xform/m2m/batch/eiq/queries/cpsXformM2M.vql#L63
- Size hints are given
Local search derived feature handling
- Non well-behaving derived features must not be indexed
Local search prepare current strategy
- All model elements are indexed that are required for a plan for any possible parameter binding
- Can be reduced by declaring parameter directions in the pattern
TODOs from last week
- Everything in progress
Aggregator test cases:
- Tomi will work on extending the test suite
Documentation
- QBE: http://viatra.net/news/2016/7/introducing-viatra-query-by-example
- Local search: under moderation
  - TODO Balázs: signal to webmaster
- Java types: TODO Zoli
- Aggregators: TODO Gaben, Zoli