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Status Needs more information
Workspace Spectrum LSF
Components Other
Created by Guest
Created on Oct 23, 2025

RELATED IDEAS

Reduce the size of the initial outgoing UDP packet when a LIM restarts

The current implementation of the LIM sends a large initial UDP packet, which includes information about all the resources that are configured. When there is a network bottleneck that limits the size of UDP packets between the management host and the execution hosts, this packet can be too large and never reach the execution host LIM. When this happens, there is a very long delay or a situation where the execution host never comes out of closed_LIM state. This is obviously fatal for the remote hosts in a farm that encounter this.

We would like to have an option that will limit this initial UDP packet size in a structured way so we can set a limit on the size, or even have the master LIM only send a small packet at first to determine how large the status packet can be.

The original case we opened created a very significant outage at a time when we were at a critical point of development and caused a delay in that development, costing us a not insignificant amount of money. This is an important request to us.

Needed By Quarter
  • Guest
    Nov 25, 2025

    To move the initial negotiation to TCP would require some rework I think for things like threads and shared memory.  All good from my perspective.  Be well.

    Reply
  • Guest
    Nov 25, 2025

    I think that in Fix Pack 15, those LIM packets are compressed.  I don't know if they are removing 'comments' from the packet, but I do know that they are in fact being compressed now.  I'm not certain what the factor was though and how much of that could simply be send over TCP instead.  There is no reason that the initial negotiation should not be TCP IMHO.  LIM resource updates should remain UDP for scalability reasons.

    Getting the configuration via LIM for Clients has always been problematic as the whole lsf.conf had to be sent.  Better to use something like https for that in the longer run.

    Reply
  • Admin
    Bill McMillan
    Nov 5, 2025

    From the support ticket is unclear why the initial packet, in your cluster is so large. Other customers with considerably larger clusters are not experiencing this.
    We would need to get to identify the root cause before considering an enhancement.


    1 reply
  • Guest
    Oct 23, 2025

    Extremely important for proper LIM restart

    Reply

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