Dear MPICH team, I use MPICH2. I have configuration: Main application which executes: "mpiexec.hydra -genvall -disable-auto-cleanup -f MpiConfigMachines.txt -launcher=rsh -n 20 node" After fail of single "node" process, I need to restart all system w/o restarting Main application process. After fail of "node" process, I execute some inner logic and then I call MPI_Abort from Master process (rank 0) to abort all "node" processes. Then I send signal SIG_TERM to mpiexec.hydra in order to finish hydra process and executing again: "mpiexec.hydra -genvall -disable-auto-cleanup -f MpiConfigMachines.txt -launcher=rsh -n 20 node" The problem: sometimes I see mpiexec.hydra which is stalled I execute: ::kill(mProcId, SIGTERM) where mProcId is "mpiexec.hydra" id. Then I see that mpiexec.hydra process is still exist, sometimes hydra_pmi_proxy too. If I execute "kill -9" mpiexec.hydra always killed and hydra_pmi_proxy too. My question is if "kill -9" in the case of "node" process failure is recommended way? If not, what is recommended way. Regards, Anatoly.