I'm using OpenMPI 1.3 on ten nodes connected with Gigabit Ethernet on Redhat Linux x86_64. 

I run a test like this: just killed the orted process and the job hung for a long time (hang for 2~3 hours then I killed the job).
I have the follow questions:
     when network failed or host failed or orted deamon was killed by accident, How long would the running mpi job notice and exit? 
     Does OpenMPI support a heartbeat mechanism or how could I fast detect the failture to avoid the mpi job hang?
thanks a lot!

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