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Fix PFASST I/O and pre-initialize coarse preconditioner for Parareal

Jacques Xing requested to merge CFD-Xing/nektar:fix-to-parallel-in-time into master

Issue/feature addressed

For Parareal, the initialization of the preconditioner on the serial-in-time coarse solver cause significant overhead proportional to the number of time step. This MR also fixes an I/O bug with PFASST.

Proposed solution

Artificially run one step on the coarse solver to initialize the preconditioner for Parareal.



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  • Functions and classes, or changes to them, are documented.
  • [ ] User guide/documentation is updated.
  • Changelog is updated.
  • [ ] Suitable tests added for new functionality.
  • Contributed code is correctly formatted. (See the contributing guidelines).
  • [ ] License added to any new files.
  • No extraneous files have been added (e.g. compiler output or test data files).
Edited by Jacques Xing

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