MPI中大小可变的消息 [英] Variable sized message in MPI

问题描述

是否存在允许使用MPI发送/接收大小可变的消息的库调用?

Is there a library call that would allow for sending/receiving of variable sized messages using MPI?

一种解决方法是在第一条消息中发送数据大小，并在其后跟随实际的有效负载，但是我想知道是否存在将这两个单独的消息组合在一起的约定.

A work around would be to send the data size in the first message and follow it with the actual payload, but I was wondering if there was a convention for combining these two separate messages.

推荐答案

提供给MPI_Recv的计数只是一个上限. MPI_Get_count可用于查找收到的物品的确切数量.

The count provided to MPI_Recv is only an upper bound. MPI_Get_count can be used to find the exact number of items received.

我猜有点类似的插座.

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