×
INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Measuring scalability of MPI program

Measuring scalability of MPI program

Measuring scalability of MPI program

(OP)
Hi. I have been measuring the scalability of some codes I have written in Fortran, and parallelized with MPI.

The thing is if I have been doing it properly (the code scales, however, I would expect it to scale a little bit more with the number of processors).

I am using an amd ryzen 7 1700 8 core processor, but I have also tested the code in a clustar with up to 80 cores.

The doubt I have is if when I run my code in the 8 processors in my ryzen cpu, each core will be working at the same frequency than working only with one. And I think that actually it doesn't, because I've read many times that the ryzen cpus, and threadripper, have some "boost" frequency (I think that you reach that by overclocking), and a base frequency, and even the benchmarks show that multitasking doesn't score as much as multiplying the performance of one clock per the number of clocks.

So, if I want to study scalability correctly, I should actually know the clock speed at which the cpu is working in each case. Also, I think it isn't the same if I put the cpu to work with the 8 cores, and let it run while I use the internet, that if it is running with nothing else going around.

Has somebody here made this type of scalability studies?

Thanks in advance.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close