mpi_cluster constructor that allows other types of communicator
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- Dominant language
- C++
- Stars
- 839
- Forks
- 220
- Avg merge
- 2d 4h
- Merged PRs (30d)
- 14
Description
Summary:
Allows other types of mpi communicator used in mpi_cluster
Description:
Currently we only allow MPI_COMM_WORLD in MPI jobs. This is not enough if we want to mix Stan with other MPI-enabled libraries when Stan only utilized part of the MPI cluster in the whole cluster, or to allow Stan to dispatch part of cluster to a specific task. An application is when used with a PDE solver where there may be multiple groups of nodes, each of which running in its own communicator for part of the PDE problem.
Reproducible Steps:
n/a, new feature
Current Output:
n/a
Expected Output:
mpi_cluster uses user-supplied communicator.
Additional Information:
Provide any additional information here.
Current Version:
v2.18.0
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by locating the mpi_cluster constructor and the existing handling of MPI_COMM_WORLD. Read the surrounding MPI integration and communicator usage before determining the API changes needed. Done means mpi_cluster accepts a user-supplied communicator so Stan can use a subset of an MPI cluster alongside other MPI-enabled work.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- distributed-systems
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100