kpccl_shm_win_alloc

接口定义

int kpccl_shm_win_alloc(size_t size, kpccl_shm_comm_h comm, void **baseptr, kpccl_shm_win_h *win)

环境变量

使用环境变量 KPCCL_SHM_TYPE 控制共享内存底层实现方式。

可选值：

• posix（默认）
• xpmem

参数

返回值

• 成功：返回KPCCL_OK
• 失败：返回KPCCL_ERROR

示例

#include <stdio.h> 
#include <mpi.h>
#include "kpccl.h" 
 
int oob_allgather_callback(const void *sendbuf, void *recvbuf, int size, void *group，kpccl_shm_datatype_t datatype)
{
switch (datatype) {
        case KPCCL_SHM_DATATYPE_CHAR:
            return MPI_Allgather(sendbuf, size, MPI_CHAR, recvbuf, size, MPI_CHAR, (MPI_Comm)group);
        case KPCCL_SHM_DATATYPE_INT:
            return MPI_Allgather(sendbuf, size, MPI_INT, recvbuf, size, MPI_INT, (MPI_Comm)group);
        case KPCCL_SHM_DATATYPE_LONG:
            return MPI_Allgather(sendbuf, size, MPI_LONG, recvbuf, size, MPI_LONG, (MPI_Comm)group);
        case KPCCL_SHM_DATATYPE_FLOAT:
            return MPI_Allgather(sendbuf, size, MPI_FLOAT, recvbuf, size, MPI_FLOAT, (MPI_Comm)group);
        case KPCCL_SHM_DATATYPE_DOUBLE:
            return MPI_Allgather(sendbuf, size, MPI_DOUBLE, recvbuf, size, MPI_DOUBLE, (MPI_Comm)group);
        default:
            kpccl_error("not support datatype");
            return KPCCL_ERROR;
   }
}

int oob_barrier_callback(void *group) 
{
    return MPI_Barrier((MPI_Comm)group);
}
 
int main()
{
    int myid, numprocs;
    int check = 1;
    MPI_Comm comm = MPI_COMM_WORLD;
    MPI_Comm_size(comm, &numprocs);
    MPI_Comm_rank(comm, &myid);
    
    kpccl_shm_oob_cb_t oob_cbs;
    kpccl_shm_oob_cb_h oob_cbs_h = &oob_cbs;
    oob_cbs_h->oob_allgather = oob_allgather_callback;
    oob_cbs_h->oob_barrier = oob_barrier_callback;
 
    kpccl_shm_comm_h kpccl_comm;
    kpccl_shm_comm_create(numprocs, myid, myid, oob_cbs_h , (void *)comm, &kpccl_comm);
    kpccl_shm_win_h win;
    void *baseptr;
    kpccl_shm_win_alloc(256, kpccl_comm, &baseptr, &win);
    MPI_Barrier(comm);
    void *attach_address;
    kpccl_shm_win_query(win, 0, &attach_address);
    ((int *)attach_address)[myid] = myid + 1;
    MPI_Barrier(comm);
    if (myid == 0) {
        for (int i = 0; i < numprocs; i++) {
            if (((int *)attach_address)[i] != I + 1) {
   check = 0;
 break;
}
    }
       if (check) {
            printf("check success\n");
        } else {
  printf("check failed\n");
        }
    }
    kpccl_shm_win_free(win);
    kpccl_shm_comm_destroy(kpccl_comm);
}
 
 

运行结果如下。

check success

上述示例演示了创建、查询、清理一个kpccl win的流程。kpccl_shm_win_alloc函数创建一个kpccl win。