Author Topic: CPU affinity not working.  (Read 1690 times)

Offline J. B.

  • New
  • *
  • Posts: 1
  • Gender: Male
CPU affinity not working.
« on: February 24, 2020, 07:18:55 AM »
After 3 years after when I post my problem Affinity still is not working: Dual Xeon E5-2697 v4  (36/72). Is something change in LassoPro that I can setup to solve problem?

Offline Jeremy Collake

  • Administrator
  • Member#
  • *****
  • Posts: 5411
  • Gender: Male
  • The Lasso
    • Bitsum
Re: CPU affinity not working.
« Reply #1 on: February 24, 2020, 09:29:17 AM »
Process Lasso now supports multiple processor groups (except for the graphs), and a novel technology (Group Extender) that allows group unaware apps to use the entire CPU instead of only a single processor group.

However, there are some fundamental limitations in Windows around processor groups.

A system like you describe, with more than 64 logical cores, would have two processor groups. In your case, 36 cores each.

If you play with the group extender, I'd love to hear your experiences. Email me at

If that doesn't suffice, please clarify your issue.

Further reading:
Software Engineer. Bitsum LLC.