LCOV - code coverage report
Current view: top level - legacy/ascend910/algorithm/base/alg_template/temp_scatter - scatter_nb.cc (source / functions) Coverage Total Hit
Test: coverage.info Lines: 0.0 % 141 0
Test Date: 2026-08-18 17:47:01 Functions: 0.0 % 11 0

            Line data    Source code
       1              : /**
       2              :  * Copyright (c) 2025 Huawei Technologies Co., Ltd.
       3              :  * This program is free software, you can redistribute it and/or modify it under the terms and conditions of
       4              :  * CANN Open Software License Agreement Version 2.0 (the "License").
       5              :  * Please refer to the License for details. You may not use this file except in compliance with the License.
       6              :  * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
       7              :  * INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
       8              :  * See LICENSE in the root of the software repository for the full text of the License.
       9              :  */
      10              : 
      11              : #include "scatter_nb.h"
      12              : #include "alg_template_register.h"
      13              : 
      14              : namespace hccl {
      15            0 : ScatterNB::ScatterNB(const HcclDispatcher dispatcher) : NBBase(dispatcher), interRank_(0), interRankSize_(0) {}
      16              : 
      17            0 : ScatterNB::~ScatterNB() {}
      18              : 
      19            0 : HcclResult ScatterNB::RunScatterNB(const std::vector<std::shared_ptr<Transport>>& links)
      20              : {
      21            0 :     HcclResult ret = HCCL_SUCCESS;
      22              :     // 需要判断input不等于outputmem,scatter 输入只有一个input时不用拷贝
      23            0 :     if (inputMem_ != outputMem_) {
      24            0 :         ret = HcclD2DMemcpyAsync(dispatcher_, outputMem_, inputMem_, stream_);
      25            0 :         CHK_PRT_RET(
      26              :             ret != HCCL_SUCCESS,
      27              :             HCCL_ERROR(
      28              :                 "[Run][ScatterOnRootRank]root rank[%u] memcpy async from input[%p] "
      29              :                 "failed to output[%p]",
      30              :                 interRank_, inputMem_.ptr(), outputMem_.ptr()),
      31              :             ret);
      32              :     }
      33              : 
      34              :     // 计算通信步数:ceiling(log2(rankSize))
      35            0 :     u32 nSteps = CalcCeilLog2(interRankSize_);
      36              : 
      37              :     // 逐步编排任务
      38            0 :     u32 deltaRoot = (interRank_ + interRankSize_ - root_) % interRankSize_;
      39            0 :     for (u32 step = 0; step < nSteps; step++) {
      40            0 :         if (deltaRoot < u32(1 << step)) {
      41            0 :             if (step != nSteps - 1 || deltaRoot < (interRankSize_ - (1 << step))) {
      42            0 :                 RunScatterTx(step, links);
      43              :             }
      44            0 :         } else if (deltaRoot < u32(1 << (step + 1)) && interRank_ != root_) {
      45            0 :             RunScatterRx(step, links);
      46              :         }
      47              :     }
      48            0 :     return HCCL_SUCCESS;
      49              : }
      50              : 
      51            0 : HcclResult ScatterNB::RunScatterTx(const u32 step, const std::vector<std::shared_ptr<Transport>>& links)
      52              : {
      53            0 :     HcclResult ret = HCCL_SUCCESS;
      54              : 
      55              :     // 计算通信对象
      56            0 :     u32 deltaRank = 1 << step;
      57            0 :     u32 sendTo = (interRank_ + deltaRank) % interRankSize_;
      58              :     // 数据份数和数据编号增量
      59            0 :     u32 nSlices = (interRankSize_ - 1 + (1 << step)) / (1 << (step + 1));
      60            0 :     u32 deltaSliceIndex = 1 << (step + 1);
      61            0 :     u32 sliceIdx = (interRank_ + (1 << step)) % interRankSize_;
      62            0 :     LINK linkRight = links[sendTo];
      63            0 :     CHK_SMART_PTR_NULL(linkRight);
      64              : 
      65            0 :     std::vector<Slice> txSlices;
      66            0 :     for (u32 i = 0; i < nSlices; i++) {
      67            0 :         if (slicesFlag_[sliceIdx] == false) {
      68            0 :             continue;
      69              :         }
      70            0 :         txSlices.push_back(slices_[sliceIdx]);
      71            0 :         sliceIdx = (sliceIdx + deltaSliceIndex) % interRankSize_;
      72              :     }
      73              : 
      74            0 :     CHK_RET(linkRight->RxAck(stream_));
      75            0 :     ret = Tx(linkRight, txSlices);
      76            0 :     CHK_PRT_RET(
      77              :         ret != HCCL_SUCCESS,
      78              :         HCCL_ERROR("[Run][Scatter]rank[%u] step[%u] RightLink tx slices count [%u] Failed", interRank_, step, nSlices),
      79              :         ret);
      80            0 :     ret = linkRight->TxWaitDone(stream_);
      81            0 :     CHK_PRT_RET(ret != HCCL_SUCCESS, HCCL_ERROR("[Run][Scatter]TxWaitDone failed"), ret);
      82              : 
      83              :     // 为了避免在大数据量场景下触发网卡轮询机制,这里添加一组Data Notify,确保对端数据接收完成才进行下一次通信任务
      84            0 :     CHK_RET(linkRight->RxDataSignal(stream_));
      85            0 :     return HCCL_SUCCESS;
      86            0 : }
      87              : 
      88            0 : HcclResult ScatterNB::RunScatterRx(const u32 step, const std::vector<std::shared_ptr<Transport>>& links)
      89              : {
      90            0 :     HcclResult ret = HCCL_SUCCESS;
      91              : 
      92              :     // 计算通信对象
      93            0 :     u32 deltaRank = 1 << step;
      94            0 :     u32 recvFrom = (interRank_ + interRankSize_ - deltaRank) % interRankSize_;
      95              :     // 数据份数和数据编号增量
      96            0 :     u32 nSlices = (interRankSize_ - 1 + (1 << step)) / (1 << (step + 1));
      97            0 :     u32 deltaSliceIndex = 1 << (step + 1);
      98            0 :     u32 sliceIdx = interRank_;
      99            0 :     LINK linkLeft = links[recvFrom];
     100            0 :     CHK_SMART_PTR_NULL(linkLeft);
     101              : 
     102            0 :     std::vector<Slice> rxSlices;
     103            0 :     for (u32 i = 0; i < nSlices; i++) {
     104            0 :         rxSlices.push_back(slices_[sliceIdx]);
     105            0 :         sliceIdx = (sliceIdx + deltaSliceIndex) % interRankSize_;
     106            0 :         slicesFlag_[sliceIdx] = true;
     107              :     }
     108              : 
     109            0 :     CHK_RET(linkLeft->TxAck(stream_));
     110            0 :     ret = Rx(linkLeft, rxSlices);
     111            0 :     CHK_PRT_RET(
     112              :         ret != HCCL_SUCCESS,
     113              :         HCCL_ERROR(
     114              :             "[Run][Scatter]rank[%u] step[%u] Right Link rx slices count [%u] "
     115              :             "Failed",
     116              :             interRank_, step, nSlices),
     117              :         ret);
     118              : 
     119            0 :     ret = linkLeft->RxWaitDone(stream_);
     120            0 :     CHK_PRT_RET(ret != HCCL_SUCCESS, HCCL_ERROR("[Run][Scatter]RxWaitDone failed"), ret);
     121              : 
     122              :     // 为了避免在大数据量场景下触发网卡轮询机制,这里添加一组Data Notify,确保对端数据接收完成才进行下一次通信任务
     123            0 :     CHK_RET(linkLeft->TxDataSignal(stream_));
     124            0 :     return HCCL_SUCCESS;
     125            0 : }
     126              : 
     127            0 : void ScatterNB::PrepareSlicesData(const u32 unitSize, const u64 totalCount, const u32 rankSize) const
     128              : {
     129            0 :     slices_.resize(rankSize);
     130            0 :     u64 sliceSize = (totalCount / rankSize) * unitSize;
     131              : 
     132            0 :     for (u32 i = 0; i < rankSize; i++) {
     133            0 :         slices_[i].offset = i * sliceSize;
     134            0 :         slices_[i].size = sliceSize;
     135              :     }
     136            0 : }
     137              : 
     138              : // scatter的入口函数
     139            0 : HcclResult ScatterNB::RunAsync(const u32 rank, const u32 rankSize, const std::vector<std::shared_ptr<Transport>>& links)
     140              : {
     141            0 :     CHK_SMART_PTR_NULL(dispatcher_);
     142            0 :     CHK_PTR_NULL(stream_.ptr());
     143            0 :     if (!outputMem_ || !inputMem_) {
     144            0 :         HCCL_ERROR("[ScatterNB][RunAsync]run_async inputmem or outputmem is null");
     145            0 :         return HCCL_E_PTR;
     146              :     }
     147              : 
     148            0 :     interRank_ = rank;
     149            0 :     interRankSize_ = rankSize;
     150            0 :     if (interRank_ == root_) {
     151            0 :         slicesFlag_.resize(interRankSize_, true);
     152              :     } else {
     153            0 :         slicesFlag_.resize(interRankSize_, false);
     154              :     }
     155              : 
     156              :     // ranksize为1时,只有当input!=output 时候进行拷贝
     157            0 :     if (interRankSize_ == 1) {
     158            0 :         if (inputMem_ != outputMem_) {
     159            0 :             CHK_RET(HcclD2DMemcpyAsync(dispatcher_, outputMem_, inputMem_, stream_));
     160              :         }
     161            0 :         return HCCL_SUCCESS;
     162              :     }
     163              : 
     164            0 :     u32 unitSize = DataUnitSize(dataType_);
     165            0 :     CHK_PRT_RET(
     166              :         unitSize == 0, HCCL_ERROR("[ScatterNB][RunAsync]rank[%u] unit data size is zero", rank), HCCL_E_INTERNAL);
     167              : 
     168              :     // 带入vecotr为空,计算每个rank的结果偏移和大小
     169            0 :     if (slices_.size() == 0) {
     170            0 :         PrepareSlicesData(unitSize, count_, interRankSize_);
     171              :     }
     172              : 
     173            0 :     CHK_PRT_RET(
     174              :         links.size() < rankSize,
     175              :         HCCL_ERROR("[ScatterNB][RunAsync]rank[%u] link size[%llu] is less than rank size", rank, links.size()),
     176              :         HCCL_E_INTERNAL);
     177              : 
     178            0 :     CHK_RET(RunScatterNB(links));
     179              : 
     180            0 :     if (barrierSwitchOn_) {
     181              :         // 执行barrier,保证数据收发完成
     182            0 :         CHK_RET(ExecuteBarrier(
     183              :             links[(interRank_ + interRankSize_ - 1) % interRankSize_], links[(interRank_ + 1) % interRankSize_]));
     184              :     }
     185            0 :     return HCCL_SUCCESS;
     186              : }
     187              : 
     188            0 : HcclResult ScatterNB::Tx(const LINK& link, const std::vector<Slice>& txSlices)
     189              : {
     190            0 :     std::vector<TxMemoryInfo> txMems;
     191            0 :     for (const Slice& txSlice : txSlices) {
     192            0 :         DeviceMem srcMem = outputMem_.range(txSlice.offset, txSlice.size);
     193            0 :         HCCL_DEBUG("tx srcMem[%p] range[%llu] size[%llu] ", srcMem.ptr(), txSlice.offset, txSlice.size);
     194            0 :         txMems.emplace_back(
     195            0 :             TxMemoryInfo{UserMemType::OUTPUT_MEM, txSlice.offset + baseOffset_, srcMem.ptr(), txSlice.size});
     196            0 :     }
     197              : 
     198            0 :     CHK_RET(link->TxAsync(txMems, stream_));
     199            0 :     return HCCL_SUCCESS;
     200            0 : }
     201              : 
     202            0 : HcclResult ScatterNB::Rx(const LINK& link, const std::vector<Slice>& rxSlices)
     203              : {
     204            0 :     std::vector<RxMemoryInfo> rxMems;
     205            0 :     for (const Slice& rxSlice : rxSlices) {
     206            0 :         DeviceMem dstMem = outputMem_.range(rxSlice.offset, rxSlice.size);
     207            0 :         HCCL_DEBUG("rx dstMem[%p] range[%llu], size[%llu] ", dstMem.ptr(), rxSlice.offset, rxSlice.size);
     208            0 :         rxMems.emplace_back(
     209            0 :             RxMemoryInfo{UserMemType::OUTPUT_MEM, rxSlice.offset + baseOffset_, dstMem.ptr(), rxSlice.size});
     210            0 :     }
     211              : 
     212            0 :     CHK_RET(link->RxAsync(rxMems, stream_));
     213            0 :     return HCCL_SUCCESS;
     214            0 : }
     215              : 
     216              : HcclResult
     217            0 : ScatterNB::GetNslbAdjInfo(const u32 rank, const u32 rankSize, const std::vector<LINK>& links, AdjInfo& nslbAdjInfo)
     218              : {
     219            0 :     if (rankSize == 1) {
     220            0 :         return HCCL_SUCCESS;
     221              :     }
     222            0 :     if (links.size() < rankSize) {
     223            0 :         return HCCL_SUCCESS;
     224              :     }
     225            0 :     HCCL_DEBUG("[ScatterNB]GetNslbAdjInfo start");
     226            0 :     u32 nSteps = 0;
     227            0 :     for (u32 temp = rankSize - 1; temp != 0; temp >>= 1, ++nSteps) {
     228              :     }
     229              : 
     230            0 :     u32 deltaRoot = (rank + rankSize - root_) % rankSize;
     231            0 :     for (u32 step = 0; step < nSteps; step++) {
     232            0 :         if (deltaRoot >= u32(1 << step)) {
     233            0 :             continue;
     234              :         }
     235            0 :         HCCL_DEBUG("[ScatterNB]now step is %u start", step);
     236            0 :         if (step != nSteps - 1 || deltaRoot < (rankSize - (1 << step))) {
     237            0 :             u32 deltaRank = 1 << step;
     238            0 :             u32 sendTo = (rank + deltaRank) % rankSize;
     239            0 :             HCCL_DEBUG("[ScatterNB]sendTo is %u", sendTo);
     240            0 :             LINK linkRight = links[sendTo];
     241            0 :             CHK_SMART_PTR_NULL(linkRight);
     242              : 
     243            0 :             NslbDpAdjInfo adjInfoStep = {};
     244            0 :             adjInfoStep.dstLocalRankId = linkRight->GetRemoteRank();
     245            0 :             adjInfoStep.phaseId = step + 1;
     246            0 :             adjInfoStep.rev = 0;
     247            0 :             nslbAdjInfo.nsAdjInfo.push_back(adjInfoStep);
     248            0 :         }
     249              :     }
     250            0 :     nslbAdjInfo.dstRankNum = nslbAdjInfo.nsAdjInfo.size();
     251            0 :     return HCCL_SUCCESS;
     252              : }
     253              : REGISTER_TEMPLATE(TemplateType::TEMPLATE_SCATTER_NB, ScatterNB);
     254              : } // namespace hccl
        

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