Atlas A2 Training Product / Atlas A2 Inference Product

This section describes the communication operators supported by the Atlas A2 training product/Atlas A2 inference product.

Single-operator zero-copy: To reduce the memory copy overhead, HCCL can directly operate the memory transferred by the service to improve communication performance.
Communication operator retry: When the communication is intermittently interrupted due to a network fault, HCCL attempts to retry the communication operator to improve communication stability.
Deterministic computing: The same output is generated if a reduction communication operator is executed for multiple times with the same hardware and input.

The following tables list the communication operators supported in expansion mode. Modes not listed are unsupported.
In tables of this section, "√" indicates supported, "☓" indicates unsupported, and "N/A" indicates not involved. The Atlas A2 training product/Atlas A2 inference product does not support single-operator zero-copy or operator retry.
Operators and network modes not listed are not supported.

HOST/HOST_TS

Operator	Network Mode	Single-Operator Zero-Copy	Deterministic Computing	Retry	Intra-Rank Communication	Inter-Rank Communication
Broadcast	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√
AllGather	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√
AllGatherV	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√
Reduce	Single-operator	☓	√	☓	√	√
	Graph (Ascend IR)	☓	√	☓	√	√
	Graph capture (ACLGraph)	☓	√	☓	√	√
AllReduce	Single-operator	☓	√	☓	√	√
	Graph (Ascend IR)	☓	√	☓	√	√
	Graph capture (ACLGraph)	☓	√	☓	√	√
Scatter	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√
ReduceScatter	Single-operator	☓	√	☓	√	√
	Graph (Ascend IR)	☓	√	☓	√	√
	Graph capture (ACLGraph)	☓	√	☓	√	√
ReduceScatterV	Single-operator	☓	√	☓	√	√
	Graph (Ascend IR)	☓	√	☓	√	√
	Graph capture (ACLGraph)	☓	√	☓	√	√
AlltoAll	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√
AlltoAllV	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√
AlltoAllVC	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√
Send	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√
Recv	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√
BatchSendRecv	Single-operator	☓	N/A	☓	√	√
	Graph (Ascend IR)	☓	N/A	☓	√	√
	Graph capture (ACLGraph)	☓	N/A	☓	√	√

AIV

Operator	Network Mode	Single-Operator Zero-Copy	Deterministic Computing	Retry	Intra-Rank Communication	Inter-Rank Communication
Broadcast	Single-operator	☓	N/A	☓	√	☓
	Graph (Ascend IR)	☓	N/A	☓	√	☓
	Graph capture (ACLGraph)	☓	N/A	☓	√	☓
AllGather	Single-operator	☓	N/A	☓	√	☓
	Graph (Ascend IR)	☓	N/A	☓	√	☓
	Graph capture (ACLGraph)	☓	N/A	☓	√	☓
AllGatherV	Single-operator	☓	N/A	☓	√	☓
	Graph (Ascend IR)	☓	N/A	☓	√	☓
	Graph capture (ACLGraph)	☓	N/A	☓	√	☓
AllReduce	Single-operator	☓	√	☓	√	☓
	Graph (Ascend IR)	☓	√	☓	√	☓
	Graph capture (ACLGraph)	☓	√	☓	√	☓
ReduceScatter	Single-operator	☓	√	☓	√	☓
	Graph (Ascend IR)	☓	√	☓	√	☓
	Graph capture (ACLGraph)	☓	√	☓	√	☓
ReduceScatterV	Single-operator	☓	√	☓	√	☓
	Graph (Ascend IR)	☓	√	☓	√	☓
	Graph capture (ACLGraph)	☓	√	☓	√	☓
AlltoAll	Single-operator	☓	N/A	☓	√	☓
	Graph (Ascend IR)	☓	N/A	☓	√	☓
	Graph capture (ACLGraph)	☓	N/A	☓	√	☓
AlltoAllV	Single-operator	☓	N/A	☓	√	☓
	Graph (Ascend IR)	☓	N/A	☓	√	☓
	Graph capture (ACLGraph)	☓	N/A	☓	√	☓
AlltoAllVC	Single-operator	☓	N/A	☓	√	☓
	Graph (Ascend IR)	☓	N/A	☓	√	☓
	Graph capture (ACLGraph)	☓	N/A	☓	√	☓

Parent topic: Communication Operator Support List