IBM Data and AI Ideas Portal for Customers


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Status Not under consideration
Workspace Spectrum LSF
Created by Guest
Created on Jan 4, 2018

RELATED IDEAS

PIM does not calculate memory utilization properly 100% of the time

PIM doesn't detect vfork() 100% of the time for Java 1.8 when checking the threads status. There are times when PIM reads memory value the vfork() as double or triple the actual amount of memory actually being used. I don't think this scenario can be avoided with the current PIM design.

  • Guest
    Reply
    |     Mar 7, 2018

    We added PIM to LSF many years ago to try and get the correct memory usage for jobs as, at the time, the kernel did not provide any method for it. PIM was never 100% accurate as it was sampling data via different methods. Different kernels, libraries and indeed how applications used memory resulted in different values, hence why PIM has numerous options to try and account for this.

    One of the key motivations of control groups being added to the kernel was to be able to report consistently on key metrics, such as cpu time and memory, for a group of processes.

    We added cgroup support to LSF ~5 years ago to allow LSF to gain access to exactly what the kernel was reporting for a set of processes rather than using PIM. That is the preferred and recommended method.

    As per the information in the PMR, when running the test case within a control group the memory is correctly reported.

    We have no plans to further enhance PIM.

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