PHAREHUB/PHARE

Restart file / code compatibility

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#1,118 opened on Jan 8, 2026

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featuregood first issue

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Description

SAMRAI restart files are setup in such a way as to match the registered patch data ids of PHARE code at a particular point in time. This can make a newer version of PHARE incompatible with existing SAMRAI restart files for PHARE.

Currently, attempting to restart PHARE with an incompatible SAMRAI restart file, will most likely lead to errors, segfaults, etc. And it may not be completely obvious the error is even related to the restart file incompatibility.

So, we probably want to consider some sort of versioning system, which could be some hash of all available patch data names for all models.

something like https://coliru.stacked-crooked.com/a/12f52e362131a9f8

Contributor guide

Research direction
Investigate using a compile time hash of all registered patch data names to detect incompatibility and provide a clear error message.
Tech stack
cpp
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40