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aclnnMatmulAllReduce

支持的产品型号

  • Atlas A2训练系列产品/Atlas 800I A2推理产品。

说明: 使用该接口时,请确保驱动固件包和CANN包都为配套的8.0.RC2版本或者配套的更高版本,否则将会引发报错,比如BUS ERROR等。

接口原型

每个算子分为两段式接口,必须先调用“aclnnMatmulAllReduceGetWorkspaceSize”接口获取计算所需workspace大小以及包含了算子计算流程的执行器,再调用“aclnnMatmulAllReduce”接口执行计算。

  • aclnnStatus aclnnMatmulAllReduceGetWorkspaceSize(const aclTensor *x1, const aclTensor *x2, const aclTensor *bias, const char* group, const char *reduceOp, int64_t commTurn, int64_t streamMode, const aclTensor *output, uint64_t *workspaceSize, aclOpExecutor **executor)
  • aclnnStatus aclnnMatmulAllReduce(void *workspace, uint64_t workspaceSize, aclOpExecutor *executor, const aclrtStream stream)

功能描述

  • 算子功能:完成mm + all_reduce_base计算。
  • 计算公式output=allreduce(x1@x2+bias)output = allreduce(x1 @ x2 + bias)

aclnnMatmulAllReduceGetWorkspaceSize

  • 参数说明:

    • x1(aclTensor*, 计算输入):公式中的输入x1,数据格式支持ND。Device侧的aclTensor,mm左矩阵。当前版本仅支持二维或者三维输入。
      • Atlas A2训练系列产品/Atlas 800I A2推理产品:数据类型支持BFLOAT16、FLOAT16。
    • x2(aclTensor*, 计算输入):公式中的输入x2,Device侧的aclTensor,mm右矩阵。
      • Atlas A2训练系列产品/Atlas 800I A2推理产品:数据类型支持BFLOAT16、FLOAT16,格式支持ND。该数据格式下,仅支持二维输入。
    • bias(aclTensor*, 计算输入):公式中的输入bias,数据格式支持ND。Device侧的aclTensor,对应计算公式中bias偏移。当前版本仅支持一维输入。
      • Atlas A2训练系列产品/Atlas 800I A2推理产品:数据类型支持BFLOAT16、FLOAT16。
    • group(char*, 计算输入):Host侧标识列组的字符串,通信域名称,数据类型支持string,通过Hccl提供的接口获取:extern HcclResult HcclGetCommName(HcclComm comm, char* commName); commName即为group。
    • reduceOp(char*, 计算输入):reduce操作类型,数据类型支持String,当前版本仅支持输入"sum"。
    • commTurn(int64_t, 计算输入):Host侧的整型,数据类型支持int64_t,通信数据切分数,即总数据量/单次通信量,当前版本仅支持输入0。
    • streamMode(int64_t, 计算输入):Host侧的整型,类型支持int64_t,AscendCL流模式的枚举,当前版本仅支持枚举值1。
    • output(aclTensor*, 计算输出):公式中的输出output,且数据类型同x1输入。Device侧的aclTensor,mm计算+all_reduce_base通信的结果。
      • Atlas A2训练系列产品/Atlas 800I A2推理产品:数据类型支持BFLOAT16、FLOAT16。
    • workspaceSize(uint64_t*, 出参):返回需要在Device侧申请的workspace大小。
    • executor(aclOpExecutor **, 出参):返回op执行器,包含了算子计算流程。
  • 返回值:

    返回aclnnStatus状态码,具体参见aclnn返回码

aclnnMatmulAllReduce

  • 参数说明:

    • workspace(void*, 入参):在Device侧申请的workspace内存地址。
    • workspaceSize(uint64_t, 入参):在Device侧申请的workspace大小,由第一段接口aclnnMatmulAllReduceGetWorkspaceSize获取。
    • executor(aclOpExecutor*, 入参):op执行器,包含了算子计算流程。
    • stream(aclrtStream, 入参):指定执行任务的AscendCL stream流。
  • 返回值:

    返回aclnnStatus状态码,具体参见aclnn返回码

约束与限制

  • 增量场景不使能MC2,全量场景使能MC2。
  • 输入x1可为二维或者三维,其维度为(b, s, k)或者(m, k)。x2必须是二维,其维度为(k, n),轴满足mm算子入参要求,k轴相等。bias若非空,其维度为(n)。
  • Atlas A2训练系列产品/Atlas 800I A2推理产品:b*s、m、k、n的值均不得超过2147483647(INT32_MAX)。
  • 当输入x1维度为(b, s, k)时,输出output维度为(b, s, n),当输入x1维度为(m, k)时,输出output维度为(m, n)。
  • x1、x2、bias计算输入的数据类型要和output计算输出的数据类型一致。
  • 只支持x2矩阵转置/不转置,x1矩阵支持不转置场景。
  • Atlas A2训练系列产品/Atlas 800I A2推理产品:支持1、2、4、8卡,并且仅支持hccs链路all mesh组网。
  • 一个模型中的通算融合MC2算子,仅支持相同通信域。

调用示例

Atlas A2训练系列产品/Atlas 800I A2推理产品:ND格式调用示例代码如下,仅供参考,具体编译和执行过程请参考编译与运行样例

#include <iostream>
#include <vector>
#include <thread>
#include "aclnnop/aclnn_matmul_all_reduce.h"

int ndev = 8;

#define CHECK_RET(cond, return_expr) \
do {                               \
    if (!(cond)) {                   \
    return_expr;                   \
    }                                \
} while (0)

#define LOG_PRINT(message, ...)     \
do {                              \
    printf(message, ##__VA_ARGS__); \
} while (0)

int64_t GetShapeSize(const std::vector<int64_t> &shape) {
    int64_t shapeSize = 1;
    for (auto i: shape) {
        shapeSize *= i;
    }
    return shapeSize;
}

template<typename T>
int CreateAclTensor(const std::vector<T> &hostData, const std::vector<int64_t> &shape, void **deviceAddr,
                    aclDataType dataType, aclTensor **tensor) {
    auto size = GetShapeSize(shape) * sizeof(T);
    // 调用aclrtMalloc申请device侧内存
    auto ret = aclrtMalloc(deviceAddr, size, ACL_MEM_MALLOC_HUGE_FIRST);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtMalloc failed. ERROR: %d\n", ret); return ret);
    // 调用aclrtMemcpy将host侧数据拷贝到device侧内存上
    ret = aclrtMemcpy(*deviceAddr, size, hostData.data(), size, ACL_MEMCPY_HOST_TO_DEVICE);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtMemcpy failed. ERROR: %d\n", ret); return ret);
    // 计算连续tensor的strides
    std::vector<int64_t> strides(shape.size(), 1);
    for (int64_t i = shape.size() - 2; i >= 0; i--) {
        strides[i] = shape[i + 1] * strides[i + 1];
    }
    // 调用aclCreateTensor接口创建aclTensor
    *tensor = aclCreateTensor(shape.data(), shape.size(), dataType, strides.data(), 0, aclFormat::ACL_FORMAT_ND,
                            shape.data(), shape.size(), *deviceAddr);
    return 0;
}

struct Args {
    uint32_t rankId;
    HcclComm hcclComm;
    aclrtStream stream;
    aclrtContext context;
};

int launchOneThreadMatmulAllReduce(Args &args) {
    int ret;
    ret = aclrtSetCurrentContext(args.context);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtSetCurrentContext failed. ERROR: %d\n", ret); return ret);
    char hcom_name[128];
    ret = HcclGetCommName(args.hcclComm, hcom_name);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("[ERROR] HcclGetCommName failed. ret = %d \n", ret); return -1);
    LOG_PRINT("[INFO] rank %d hcom: %s stream: %p, context : %p\n", args.rankId, hcom_name, args.stream,
            args.context);

    std::vector<int64_t> x1Shape = {32, 64};
    std::vector<int64_t> x2Shape = {64, 128};
    std::vector<int64_t> biasShape = {128};
    std::vector<int64_t> outShape = {32, 128};
    void *x1DeviceAddr = nullptr;
    void *x2DeviceAddr = nullptr;
    void *biasDeviceAddr = nullptr;
    void *outDeviceAddr = nullptr;
    aclTensor *x1 = nullptr;
    aclTensor *x2 = nullptr;
    aclTensor *bias = nullptr;
    aclTensor *out = nullptr;

    int64_t commTurn = 0;
    int64_t streamMode = 1;
    uint64_t workspaceSize = 0;
    aclOpExecutor *executor;
    void *workspaceAddr = nullptr;

    long long x1ShapeSize = GetShapeSize(x1Shape);
    long long x2ShapeSize = GetShapeSize(x2Shape);
    long long biasShapeSize = GetShapeSize(biasShape);
    long long outShapeSize = GetShapeSize(outShape);
    std::vector<int16_t> x1HostData(x1ShapeSize, 0);
    std::vector<int16_t> x2HostData(x2ShapeSize, 0);
    std::vector<int16_t> biasHostData(biasShapeSize, 0);
    std::vector<int16_t> outHostData(outShapeSize, 0);
    // 创建 tensor
    ret = CreateAclTensor(x1HostData, x1Shape, &x1DeviceAddr, aclDataType::ACL_FLOAT16, &x1);
    CHECK_RET(ret == ACL_SUCCESS, return ret);
    ret = CreateAclTensor(x2HostData, x2Shape, &x2DeviceAddr, aclDataType::ACL_FLOAT16, &x2);
    CHECK_RET(ret == ACL_SUCCESS, return ret);
    ret = CreateAclTensor(biasHostData, biasShape, &biasDeviceAddr, aclDataType::ACL_FLOAT16, &bias);
    CHECK_RET(ret == ACL_SUCCESS, return ret);
    ret = CreateAclTensor(outHostData, outShape, &outDeviceAddr, aclDataType::ACL_FLOAT16, &out);
    CHECK_RET(ret == ACL_SUCCESS, return ret);
    // 调用第一段接口
    ret = aclnnMatmulAllReduceGetWorkspaceSize(x1, x2, bias, hcom_name, "sum", commTurn, streamMode,
                                            out, &workspaceSize, &executor);
    CHECK_RET(ret == ACL_SUCCESS,
            LOG_PRINT("aclnnMatmulAllReduceGetWorkspaceSize failed. ERROR: %d\n", ret); return ret);
    // 根据第一段接口计算出的workspaceSize申请device内存
    if (workspaceSize > 0) {
        ret = aclrtMalloc(&workspaceAddr, workspaceSize, ACL_MEM_MALLOC_HUGE_FIRST);
        CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("allocate workspace failed. ERROR: %d\n", ret); return ret);
    }
    // 调用第二段接口
    ret = aclnnMatmulAllReduce(workspaceAddr, workspaceSize, executor, args.stream);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclnnMatmulAllReduce failed. ERROR: %d\n", ret); return ret);
    //(固定写法)同步等待任务执行结束
    ret = aclrtSynchronizeStreamWithTimeout(args.stream, 10000);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtSynchronizeStream failed. ERROR: %d\n", ret); return ret);
    LOG_PRINT("device%d aclnnMatmulAllReduce execute success \n", args.rankId);
    // 释放device资源,需要根据具体API的接口定义修改
    if (x1 != nullptr) {
        aclDestroyTensor(x1);
    }
    if (x2 != nullptr) {
        aclDestroyTensor(x2);
    }
    if (bias != nullptr) {
        aclDestroyTensor(bias);
    }
    if (out != nullptr) {
        aclDestroyTensor(out);
    }
    if (x1DeviceAddr != nullptr) {
        aclrtFree(x1DeviceAddr);
    }
    if (x2DeviceAddr != nullptr) {
        aclrtFree(x2DeviceAddr);
    }
    if (biasDeviceAddr != nullptr) {
        aclrtFree(biasDeviceAddr);
    }
    if (outDeviceAddr != nullptr) {
        aclrtFree(outDeviceAddr);
    }
    if (workspaceSize > 0) {
        aclrtFree(workspaceAddr);
    }
    aclrtDestroyStream(args.stream);
    HcclCommDestroy(args.hcclComm);
    aclrtDestroyContext(args.context);
    aclrtResetDevice(args.rankId);
    return 0;
}

int main(int argc, char *argv[]) {
    int ret;
    int32_t devices[ndev];
    for (int i = 0; i < ndev; i++) {
        devices[i] = i;
    }
    HcclComm comms[128];
    ret = aclInit(nullptr);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclInit failed. ERROR: %d\n", ret); return ret);
    // 初始化集合通信域
    for (int i = 0; i < ndev; i++) {
        ret = aclrtSetDevice(devices[i]);
        CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtSetDevice failed. ERROR: %d\n", ret); return ret);
    }
    ret = HcclCommInitAll(ndev, devices, comms);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("HcclCommInitAll failed. ERROR: %d\n", ret); return ret);
    Args args[ndev];
    aclrtStream stream[ndev];
    aclrtContext context[ndev];
    for (uint32_t rankId = 0; rankId < ndev; rankId++) {
        ret = aclrtSetDevice(rankId);
        CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtSetDevice failed. ERROR: %d\n", ret); return ret);
        ret = aclrtCreateContext(&context[rankId], rankId);
        CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtCreateContext failed. ERROR: %d\n", ret); return ret);
        ret = aclrtCreateStream(&stream[rankId]);
        CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtCreateStream failed. ERROR: %d\n", ret); return ret);
    }
    // 启动多线程
    std::vector<std::unique_ptr<std::thread>> threads(ndev);
    for (uint32_t rankId = 0; rankId < ndev; rankId++) {
        args[rankId].rankId = rankId;
        args[rankId].hcclComm = comms[rankId];
        args[rankId].stream = stream[rankId];
        args[rankId].context = context[rankId];
        threads[rankId].reset(new(std::nothrow) std::thread(&launchOneThreadMatmulAllReduce, std::ref(args[rankId])));
    }
    for (uint32_t rankId = 0; rankId < ndev; rankId++) {
        threads[rankId]->join();
    }
    aclFinalize();
    return 0;
}