kparzysz-quic commented on PR #10945:
URL: https://github.com/apache/tvm/pull/10945#issuecomment-1093393396

   To add more context here: the RPC server will connect to a first available 
port in some range (which typically starts at 7070).  If there are two servers 
running on the same machine, one of them will get 7070, and the other 7071.  
The clients will not know the actual port, instead they will query the RPC 
tracker for a server with a given device key.  Since the Hexagon RPC server 
always used the same key, the tracker could not distinguish between the one 
bound to 7070, and the one bound to 7071.  To avoid this ambiguity, make the 
device key unique (by attaching the PID of the process creating it to it).


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