lzhou-arch commented on issue #4887: multi-node training hangs occasionally
   @feiyulv Have you figured it out? I have exactly the same issue. 
   After I launch the job on a two-machine cluster, it hangs at 
   [14:45:23] src/van.cc:183: Barrier count for 7 : 3
   @szha Can you reopen this post since the issue is still pending? It would be 
great to have some pointers to debug the problem. 

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