Struct mpi::datatype::Partition

pub struct Partition<'b, B: 'b + ?Sized, C, D> { /* private fields */ }

Adds a partitioning to an existing Buffer so that it becomes Partitioned

Implementations

impl<'b, B, C, D> Partition<'b, B, C, D>

where B: 'b + Buffer + ?Sized, C: Borrow<[Count]>, D: Borrow<[Count]>,

pub fn new(buf: &B, counts: C, displs: D) -> Partition<'_, B, C, D>

Partition buf using counts and displs

Examples found in repository

examples/scatter_varcount.rs (line 30)

fn main() {
    let universe = mpi::initialize().unwrap();
    let world = universe.world();

    let rank = world.rank();
    let size = world.size();

    let root_rank = 0;
    let root_process = world.process_at_rank(root_rank);

    let mut buf = vec![0; rank as usize];

    if rank == root_rank {
        let msg: Vec<_> = (0..size).flat_map(|i| (0..i)).collect();
        let counts: Vec<Count> = (0..size).collect();
        let displs: Vec<Count> = counts
            .iter()
            .scan(0, |acc, &x| {
                let tmp = *acc;
                *acc += x;
                Some(tmp)
            })
            .collect();
        let partition = Partition::new(&msg[..], counts, &displs[..]);
        root_process.scatter_varcount_into_root(&partition, &mut buf[..]);
    } else {
        root_process.scatter_varcount_into(&mut buf[..]);
    }

    assert!(buf.iter().zip(0..rank).all(|(&i, j)| i == j));
    println!("Process {} got message: {:?}", rank, buf);
}

examples/immediate_scatter_varcount.rs (line 30)

fn main() {
    let universe = mpi::initialize().unwrap();
    let world = universe.world();

    let rank = world.rank();
    let size = world.size();

    let root_rank = 0;
    let root_process = world.process_at_rank(root_rank);

    let mut buf = vec![0; rank as usize];

    if rank == root_rank {
        let msg: Vec<_> = (0..size).flat_map(|i| (0..i)).collect();
        let counts: Vec<Count> = (0..size).collect();
        let displs: Vec<Count> = counts
            .iter()
            .scan(0, |acc, &x| {
                let tmp = *acc;
                *acc += x;
                Some(tmp)
            })
            .collect();
        let partition = Partition::new(&msg[..], counts, &displs[..]);
        mpi::request::scope(|scope| {
            root_process
                .immediate_scatter_varcount_into_root(scope, &partition, &mut buf[..])
                .wait();
        });
    } else {
        mpi::request::scope(|scope| {
            root_process
                .immediate_scatter_varcount_into(scope, &mut buf[..])
                .wait();
        });
    }

    assert!(buf.iter().zip(0..rank).all(|(&i, j)| i == j));
    println!("Process {} got message: {:?}", rank, buf);
}

Trait Implementations

impl<'b, B, C, D> AsDatatype for Partition<'b, B, C, D>

where B: 'b + AsDatatype + ?Sized,

type Out = <B as AsDatatype>::Out

The type of the associated MPI datatype (e.g. SystemDatatype or UserDatatype)

fn as_datatype(&self) -> Self::Out

The associated MPI datatype

impl<'b, B, C, D> Partitioned for Partition<'b, B, C, D>

where B: 'b + ?Sized, C: Borrow<[Count]>, D: Borrow<[Count]>,

fn counts(&self) -> &[Count]

The count of elements in each partition.

fn displs(&self) -> &[Count]

The displacement from the start of the buffer for each partition.

impl<'b, B, C, D> Pointer for Partition<'b, B, C, D>

where B: 'b + Pointer + ?Sized,

fn pointer(&self) -> *const c_void

A pointer to the starting address in memory

impl<'b, B, C, D> PartitionedBuffer for Partition<'b, B, C, D>

where B: 'b + Pointer + AsDatatype + ?Sized, C: Borrow<[Count]>, D: Borrow<[Count]>,