SyncType

#include <poplar/SyncType.hpp>

namespace poplar

Poplar classes and functions.

A VectorList is a list of vectors with a specific layout and with the usage semantics of a 2D vector.

A 1D vector must be laid out in a contiguous memory region. A 2D vector is a vector of 1D vectors. Each of these 1D vectors that make up a 2D vector is called a “sub-vector” for the remainder of this document. The elements of a 2D vector can be accessed by indexing the 2D vector along the outer and inner dimensions as A[outer][inner].

The following two categories of layouts are supported:

1. VectorListLayout::DELTANELEMENTS is a memory efficient 2D vector layout. For legacy systems VectorListLayout::DELTAN served a similar purpose. Each sub-vector must be laid out as a contiguous memory region but the sub-vectors may may not be laid out contiguous with respect to each other in memory. Each sub-vector may have a different length.

2. VectorListLayout::ONE_PTR and other VectorListLayout layouts that are prefixed by SCALED_PTR are for Poplar runtime use only.

Enums

enum class SyncType

An enumeration used to state what type of synchronisation a Sync program represents.

Values:

enumerator INTERNAL

Each tile waits until all the other tiles in the same IPU reach the Sync program before continuing.

enumerator EXTERNAL

Each tile waits until all the other tiles in all IPUs in the device reach the Sync program before continuing.

enumerator GLOBAL

Each tile waits until all the other tiles in all IPUs globally reach the Sync program before continuing.

Functions

std::ostream &operator<<(std::ostream &os, const SyncType &t)