Struct TopologyInfo 

pub struct TopologyInfo { /* private fields */ }

MPI topology information gathered across all ranks in a communicator.

This is produced by a collective operation (Communicator::topology) and contains the rank-to-host mapping, MPI library metadata, and optional SLURM job information.

Display

The Display implementation produces a human-readable topology report:

================ MPI Topology ================
Library:   Open MPI v4.1.6
Standard:  MPI 4.0
Threads:   Funneled
Processes: 8 across 2 nodes

  compute-01: ranks 0, 1, 2, 3  (4 processes)
  compute-02: ranks 4, 5, 6, 7  (4 processes)
==============================================

Implementations

impl TopologyInfo

pub fn hosts(&self) -> &[HostEntry]

Hosts and their assigned ranks, ordered by first rank on each host.

pub fn library_version(&self) -> &str

MPI library version string (implementation-specific).

pub fn standard_version(&self) -> &str

MPI standard version string.

pub fn thread_level(&self) -> ThreadLevel

Thread support level granted by the MPI runtime.

pub fn size(&self) -> i32

Total number of processes in the communicator.

pub fn num_hosts(&self) -> usize

Number of distinct hosts.

Trait Implementations

impl Display for TopologyInfo

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.