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Hi,
I came across a potential issue with launching 4 processes for notepad using IntelMPI 2021.8.
I can launch the processes using Windows PowerShell and navigating to the folder where IntelMPI 2021.8 (and mpiexec.exe) is installed and run the following command form Windows PowerShell:
- .\mpiexec.exe -np 4 "C:\Windows\System32\notepad.exe"
It launches 4 notepad processes and mpiexec.exe (from which I can see in task manager). However when I kill mpiexec.exe in task manager I would expect the 4 notepad processes to die as well but they do not. They hang.
In tried with IntelMPI 2018.3.210. When I run the same command as above using IntelMPI 2018.3.210 I get 4 notepad processes and when I kill mpiexec.exe it automatically kills the 4 processes as well.
So I was wondering about this difference in behaviour between MPI versions. By killing mpiexec.exe should it not kill all attached processes (as seen in version 2018.3.210)?
Thanks in advance.
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Hi,
Thank you for posting in Intel Community.
Please set the following environment variable.
I_MPI_HYDRA_BSTRAP_KEEP_ALIVE
Set this variable to keep hydra_bstrap_proxy alive after launching hydra_pmi_proxy.
Syntax
I_MPI_HYDRA_BSTRAP_KEEP_ALIVE=<arg>
Argument
<arg> | Binary indicator |
enable | yes | on | 1 | Do not close hydra_bstrap_proxy. |
disable | no | off | 0 | Close hydra_bstrap_proxy. This is the default value. |
Description
Set this variable to keep hydra_bstrap_proxy alive after launching hydra_pmi_proxy. It allows you to keep full process tree (mpiexec —> hydra_bstrap_proxy —> hydra_pmi_proxy —> app) connected on localhost. The default value closes hydra_bstrap_proxy to reduce the number of running processes.
Please refer this link
Thanks and regards,
Aishwarya
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Hi,
Thank you for posting in Intel Community.
Please set the following environment variable.
I_MPI_HYDRA_BSTRAP_KEEP_ALIVE
Set this variable to keep hydra_bstrap_proxy alive after launching hydra_pmi_proxy.
Syntax
I_MPI_HYDRA_BSTRAP_KEEP_ALIVE=<arg>
Argument
<arg> | Binary indicator |
enable | yes | on | 1 | Do not close hydra_bstrap_proxy. |
disable | no | off | 0 | Close hydra_bstrap_proxy. This is the default value. |
Description
Set this variable to keep hydra_bstrap_proxy alive after launching hydra_pmi_proxy. It allows you to keep full process tree (mpiexec —> hydra_bstrap_proxy —> hydra_pmi_proxy —> app) connected on localhost. The default value closes hydra_bstrap_proxy to reduce the number of running processes.
Please refer this link
Thanks and regards,
Aishwarya
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Thanks Aishwarya for the information.
I have set the environment variable to I_MPI_HYDRA_BSTRAP_KEEP_ALIVE = yes. I can clearly see all my processes (mpiexec —> hydra_bstrap_proxy —> hydra_pmi_proxy —> app) in task manager. However, I would expect that killing mpiexec.exe should kill all the remain processes including the app (notepad.exe in here). Is this not the case? If I kill mpiexec.exe all the remain processes stay alive (I would expect them to die as well). I observe this in 2021.8.
In version 2018.3.210 if I kill mpiexec.exe, notepad.exe dies as well.
Thanks again,
Dan
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Just wanted to say that this has solved my problem in my original application.
Thanks once again
Dan
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Hi,
Thanks for accepting our solution. If you need any additional information, please post a new question as this thread will no longer be monitored by Intel.
Thanks and regards,
Aishwarya
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