# Job sent on OpenPBS hangs in R status

**URL:** <https://community.openpbs.org/t/job-sent-on-openpbs-hangs-in-r-status/2935>\
**Category:** Users/Site Administrators\
**Created:** [January 19, 2022, 11:59am UTC](https://community.openpbs.org/t/job-sent-on-openpbs-hangs-in-r-status/2935 "2022-01-19T11:59:36Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![adarsh](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adarsh](https://community.openpbs.org/u/adarsh)\
**Post date:** [January 31, 2022, 6:15pm UTC](https://community.openpbs.org/t/job-sent-on-openpbs-hangs-in-r-status/2935/13 "2022-01-31T18:15:56Z")

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> [@Blackest](#):
>
> I am still confused about the passwordless thing. I am using openPBS on a single machine. I am not using external nodes or servers. I am connecting to the machine with SSH and password, but then I am sending the job using openPBS on the machine from the machine itself.

- mpi uses either rsh or ssh as launchers , if your MPI is compiled with openpbs TM libraries, then PBS would take care of the internode communication .  
[Openmpi support - #5 by adarsh](https://community.openpbs.org/t/openmpi-support/1396/5)

> [@Blackest](#):
>
> Maybe I am missing something but I do not need to do ssh on the server or different nodes. I only use SSH to access the workstation remotely.

Please check this link [c - MPI programs hanging up - Stack Overflow](https://stackoverflow.com/questions/29071788/mpi-programs-hanging-up)

> [@Blackest](#):
>
> Regarding the second point, I am able to run mpirun with all the available cores (20) without problems.

Please share the batch script and env variables used .

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