[Auto Parallel] fix hang caused by different process group initialization order #68847
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deepllz
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PR Category
Auto Parallel
PR Types
Bug fixes
Description
修复由于通信组创建顺序不同导致的hang的问题。此问题首次出现在调试allgather moe动转静测试中，具体原因如下：
目前动转静通信组的建立是在静半reshard模块中，例如：nd_mesh_reshard_func.py，创建通信组之后所有进程都要同步一次，用以避免其他的问题。所以要求全部rank创建通信组的顺序必须严格一致，否则可能导致hang。例如有4个进程[0, 1, 2, 3]，有的进程创建了[0, 2]通信组，有的进程没有，就会导致hang，moe场景恰好触发了这个case。
Pcard-73145