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Status Delivered
Workspace Spectrum LSF
Created by Guest
Created on Jul 8, 2019

RELATED IDEAS

Availability of direct communication to the mbatch daemon from programming interface

In our own pam module we use the function lsb_openjobinfo to identify if a user has a running job on the node or not. We do this to decide if the user can establish a connection to the node (usually the ssh connection at the beginning of a job). Unfortunately, the function lsb_openjobinfo talk to the fork of the mbatchd. So the information about the status of a job and the allocated slots could be 10s old (MBD_REFRESH_TIME ). This causes randomly errors before rewriting the pam module (see support case ID). All workarounds are not realy satisfying (check the status over 10s -> delay in runing the task, use a fake lsf.conf -> inconstency of configuration files or try to handle it by hostslist in a file -> additional I/O). So it would be greateful if one can directly talk to the mbatch daemon from the programming interface or have a parameter like NEWJOB_REFRESH to send updates to the fork of mbatchd of the event PEND to RUN.

  • Guest
    Reply
    |     Jul 10, 2019

    Salbem,

    Have you reviewed the following pam module: https://github.com/IBMSpectrumComputing/lsf-plugins/tree/master/pam_lsf. It is designed to block logins with the exception of users who have jobs. It introduces a delay due to the fact that NEWJOB_REFRESH does not update the status information to 'RUN' from 'PEND' and populate the execution node. This is also important for jobs that are using 'bsub -IX' for SSH port forwarding.

    I do agree with you that having a switch in the code for when you are asking for a specific host/user that we should be able to query the master batch daemon directly though.

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