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CPU VPs configuration on VMWARE

  • 1.  CPU VPs configuration on VMWARE

    Posted Tue May 17, 2022 12:46 PM

    Hi folks, long time no see, I hope everybody doing well.


    I have a question: I have read and tested configuring more than one CPU VP per core on AIX Power VM, using SMT=2 or 1 at the system level. This works pretty well.
    I would like to know what is your opinion (with respective real life production experience) to do such a config on a VMWARE/Intel architecture.
    The hypervisor will host Xeon Gold procs @2,6Ghz. Preferably no other VM in that system.
    Up to how many CPU VPS would you configure per CORE .

    1. Definitely 1 per core, not more ?
    2. 2 per core ?
    3. 3 per core ?
    4. More ?


    Art K has been talking about 1 CPU VP per 'slice' of 700Khz, does this work also with VMWare/Intel ?





    Eric Vercelletto
    Data Management Architect and Owner / Begooden IT Consulting
    KandooERP Founder and CTO
    IBM Champion 2013,2014,2015,2016,2017,2018,2019,2020

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  • 2.  RE: CPU VPs configuration on VMWARE

    IBM Champion
    Posted Tue May 17, 2022 12:55 PM
    On Intel @ 2.6GHZ I would:

    • Disable hyperthreading (but not on AMD, only Intel)
    • Configure three CPU VPs per core
    • Use affinity if there are multiple chips/sockets to limit CPU VP migration off a single socket where practical. Affine other VP types (NET, AIO, etc.) to the other sockets.
    • The only exception would be a DSS environment (complex queries, single threaded) where I would do one VP per core across all sockets.
    The only problem with VM environments, besides the possibility of sharing resources on the "frame", is that performance is inconsistent making it hard to test and evaluate different configurations. Make many tests with each setup before deciding which is working for you.

    Art S. Kagel, President and Principal Consultant
    ASK Database Management Corp.

  • 3.  RE: CPU VPs configuration on VMWARE