MPI_Allreduce 源
我正在编写涉及 for 循环的代码，该循环在每个索引处进行计算。
这些计算中的最小值存储在变量中，我在程序末尾使用 MPI_Allreduce 来确定所有进程的全局最小值。
但是，我需要一种方法来知道哪个进程具有最小值，即 MPI_Allreduce 可以告诉我哪个进程发送结果吗？值最小的过程？我需要从该过程中获取一些额外的数据。
预先感谢您的任何帮助！
I am writing code that involved a for loop that makes calculations at each index.
The smallest of these calculations is stored in a variable and I use MPI_Allreduce at the end of the program to determine the global minimum across all processes.
However, I need a way of knowing which process has the smallest value, i.e. can MPI_Allreduce tell me which process sends the result? the process with the smallest value? there is some additional data I need to get from that process.
Thanks in advance for any help!
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您可以在reduce 操作中使用
MPI_MINLOC运算符来接收具有最小值的进程的排名（更具体地说，是具有最小值的排名最低的进程）。请参阅http://www.netlib.org/utk/papers/ mpi-book/node114.html#SECTION005103000000000000000
You can use the
MPI_MINLOCoperator in the reduce operation to receive the rank of the process with the minimal value (more specifically, the lowest ranked process that has a minimal value).See http://www.netlib.org/utk/papers/mpi-book/node114.html#SECTION005103000000000000000