3.2 reduce-scatter overlap p2p 3.3 reduce-scatter overlap pipeline chunk 四、 tp_comm_bulk_ag 和 tp_comm_bulk_rs 五、小结 六、参考 这篇文章想来探索Megatron中实现计算通信overlap的方法。具体来说,Megatron的dp、tp和pp部分,都有可以做overlap的地方,本文探索的是tp部分(更准确地说是megatron sp-tp)。
Hello, When I configured --sequence-parallel and --tp-comm-overlap and started the training. It shows below information: TypeError: UbufP2PCommOverlap(): incompatible function arguments. The following argument types are supported: 1. () ...
1)为了排查是否是通信提交方式导致的性能差异,我们将Ring-Flash-Attention中的P2P通信提交方式由batch改为了单个提交方式。 P2P通信改成以单独提交的方式后的Ring-Flash-Attention Forward Trace 如上图所示,将P2P通信改为单独提交的方式后,Ring-Flash-Attention 的性能有所提升,但通信 kernel 的调度仍与 NeMo 有显著...
print('WARNING: Setting args.overlap_p2p_comm to False since non-interleaved ' 'schedule does not support overlapping p2p communication') if args.overlap_param_gather: assert args.use_distributed_optimizer, \ '--overlap-param-gather only supported with distributed optimizer' # Parameters dtype. arg...
The PP communication overlap is enabled when settingoverlap_p2p_comm=true. Also, settingbatch_p2p_comm=falseuses separate kernels for the send and the receive, which further improves the communication efficiency and GPU resource utilization. NeMo supports PP communication overlap only with virtual...
Similar to TP communication overlap, PP communication overlap configurations are added via the callbackMegatronCommOverlapCallback. The PP communication overlap is enabled when settingoverlap_p2p_comm=True. Also, settingbatch_p2p_comm=Falseuses separate kern...
因此,AllGather 并不必然依赖 P2P 通信。同时,在 AllGather 中,通信的分块策略(tilescomm)与 GEMM 计算的分块策略相互解耦。这一设计提供了一种灵活的权衡方式,能够在不损害 GEMM 效率的前提下,选择 Overlap 机会与通信效率之间的最佳平衡。 7.2.4 方案对比...
The PP communication overlap is enabled when settingoverlap_p2p_comm=true. Also, settingbatch_p2p_comm=falseuses separate kernels for the send and the receive, which further improves the communication efficiency and GPU resource utilization. NeMo supports PP communication overlap only with virtual...