Recommended # of Load Agents to Users?

4 posts, 0 answers
  1. David
    David avatar
    19 posts
    Member since:
    Jun 2019

    Posted 21 Oct Link to this post

    Is there any recommendation on about how many virtual users can run against a machine with certain specs?

     

    We're trying to make a determination how many machines we'll need to procure to run the load we're needing.

  2. Plamen Mitrev
    Admin
    Plamen Mitrev avatar
    157 posts

    Posted 22 Oct Link to this post

    Hi David,

    Based on our experience, approximately 8 users can be supported per CPU unit. This seems to have realistic load testing results. If there are a lot more users allocated per CPU. there might be HTTP requests queued up, due to overload of the execution machine CPU.

    You can use the above information as a base guideline and experiment on your end to find the optimal virtual user count per CPU.

    I remain available, if you have other questions.

    Regards,
    Plamen Mitrev
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  3. David
    David avatar
    19 posts
    Member since:
    Jun 2019

    Posted 22 Oct in reply to Plamen Mitrev Link to this post

    Thanks Plamen 

    So to confirm if our CPU has 8 cores, than the recommended is 64 users for that machine?  If I understand what you are saying.

  4. Plamen Mitrev
    Admin
    Plamen Mitrev avatar
    157 posts

    Posted 22 Oct Link to this post

    Hi David,

    Yes, that is absolutely correct. Our tests approximate that 8 virtual users per CPU, or in your case 64 virtual users in total, produce good results. That said, I would advise you to leave some room for other application and services that are running on the machine and of course for Windows. My advice is to use only 6 or 7 of the CPUs or 48-56 virtual users.

    Please let me know, if there is anything else that concerns you.

    Regards,
    Plamen Mitrev
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