PCM Development/Palladio Concall/Minutes 20161212

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Attendees

  • Steffen Becker (TUC)
  • Christian Vögele (Fortiss)
  • Markus Frank (TUC)
  • Michael Langhammer (KIT)
  • Misha Strittmatter (KIT)
  • Sebastian Krach (FZI)
  • Stephan Seifermann (FZI)

Stateful/Stateless in Palladio

  • Christian speaks for Felix
  • Several PCM extensions developed / planned by fortiss
  • Recurring issue: stateful/stateless
  • Examples
    • Memory extension by state that decides about garbage collection (by Felix)
    • Need state for several extensions (simulation works, analytical solver most probably not)
  • Arguments against stateful plugins?
    • Steffen: old discussion (publications of Lucia, stateful PCM branch)
    • Steffen: main problem are solvers because do not converge anymore (state space explosion)
    • Steffen: often probabilistic modeling is a workaround for state
    • Steffen: use cases for stateful PCM might exist (e.g. embedded systems) but do not require properties that cannot be calculated with state anymore
  • Misha: State in language or in simulation/solver?
    • Christian: Example state-based GC triggering
    • Steffen: Garbage collection can be modelled with probabilistic modeling
    • Christian: Paper available?
    • Steffen: Watch processing rate, if 10% GC time, ...
    • Christian: So, the major issue is introducing new parameters in language?
    • Steffen: Yes, because wrong usage of PCM.
    • Christian: Passive resources have state. Do they work with LQN solvers?
    • Steffen: Yes, is treated as a special construct.
  • Christian: Built an extension that introduces guards for Actions introduced (if action A did not run yet, action B must not run)
    • Steffen: Steady-state assumption does not hold anymore, not proovable. If not important for use case, it is ok.
    • Steffen: Would use two separate runs for the two situations.
  • Christian: Will talk with Felix if probabilistic modeling could address issues.
    • Misha: Might be a topic for the next concall again

JIRA Documentation Type

Editor Value Editing in Ressource Environment

  • Resource environment holds several values
    • linking resource: throughput, latency
    • are random values
    • good enough if editable via edit box or should StoEx editor be available?
    • latency could be useful, but is processing rate really a random variable?
    • Steffen: Garbage collection or background processes can be modelled with this feature
    • Misha: Do simulators support this?
    • Steffen: Yes, Simulizar and SimuCom at least.
  • Misha: OK, will add the StoEx dialogs

Updated QuAL Report

  • Only one author and branded with CloudScale
    • Steffen: No reason against converting the document. Would be appreciated.

EMFProfiles update site

  • Update site was down, Christian repaired it and pointed to old build
  • Steffen: We have own EMFProfiles that works and deploys nightly builds
  • Steffen: Issue with GIT-based builds fixed for Sirius editors but other projects might have to be adjusted as the Sirius editors
    • Update site still has to be checked
    • Michael: Nightly drop from last week worked but not tested deeply

Meta-Model Generator

  • Steffen: generation of meta-model code works again, so ready for meta-model release
  • Simulizar and SimuCom build against nightly build of PCM, has to be changed back to release when releasing
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