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Status Not under consideration
Workspace Storage Scale (formerly known as GPFS)
Created by Guest
Created on Mar 30, 2020

RELATED IDEAS

Free unused dynamic heap memory

The GPFS memory footprint is defined by
- pagepool
- shared memory pool
- heap
- stack of all threads (512KB per GPFS thread, usually the stack size is not an issue)
"pagepool" and "shared memory pool" are configurable, but no parameter in GPFS to control the heap size. From OS view, we can use resource control to control the memory size of mmfsd (likes ulimit setting, the memory control subsystem of cgroup), the daemon will be killed by OS when mmfsd memory usage exceed the setting. That is not agood idea for GPFS to enforce the memory usage because of mmfsd died will impact the application and the whole setup.
The cache design doesn't work well in our case because of too many objects are cached and consume large number of memory space.

Idea priority Medium
  • Guest
    Reply
    |     Sep 30, 2020

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - IBM Spectrum Scale
    Product - Spectrum Scale (formerly known as GPFS) - Public RFEs
    Component - Product functionality

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - IBM Spectrum Scale
    Product - Spectrum Scale (formerly known as GPFS) - Public RFEs
    Component - Technical Foundation

  • Guest
    Reply
    |     Sep 17, 2020

    We do not foresee this behavior being changed in the next few releases.

  • Guest
    Reply
    |     Jun 29, 2020

    Clarification:
    We guarantee our users a defined amount of memory on each compute node. Therefore it is mandatory to know and define the memory usage of GPFS.
    In our setup we use only 8 GB pagepool. But we had to learn that in addition to the pagepool a dynamic memory is used. But this can't be limited.
    We were faced a couple of times that the system healthchecker checked empty nodes and marked them as offline due to not enough memory is available.

  • Guest
    Reply
    |     Jun 26, 2020

    It is not clear to me what problem you are asking us to solve. Can you describe more explicitly what behavior you want from Scale?

  • Guest
    Reply
    |     Jun 5, 2020

    Can you please explain the problem to be solved?

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