CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Hardware

Deteriorated CPU performance

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree2Likes
  • 2 Post By flotus1

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 6, 2022, 10:41
Post Deteriorated CPU performance
  #1
New Member
 
Mashrur Muntasir Nuhash
Join Date: Sep 2022
Posts: 2
Rep Power: 0
Mmn11 is on a distinguished road
I'm using Ansys 2020 R1 and my PC has intel core i5 8th gen processor. It has 4cores and the base speed is 1.8GHz. When I run simulations in fluent I usually run parallel processing with 3 cores. My PC has 16GB ram. While a simulation runs the CPU usage is consistent at around 90% and RAM usage is 90-97%.

However, last few days my CPU usage is fluctuating around 30-60%, and a simulation which took 3 hours to complete previously is now requiring 15-15 hours. The ram usage is still consistent around 90%. Did any of you face similar issues? If so, please help!

I will be grateful for any suggestions. Cheers!
Mmn11 is offline   Reply With Quote

Old   October 6, 2022, 12:17
Default
  #2
Super Moderator
 
flotus1's Avatar
 
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,406
Rep Power: 48
flotus1 has a spectacular aura aboutflotus1 has a spectacular aura about
Sounds a lot like you are running out of physical memory.
Don't trust the memory total usage reported by Windows task manager. Your PC will start swapping (using disk space instead of memory) long before task manager reports 100% memory usage.
That would be in line with you seeing reduced CPU usage now. The data just can't be shoveled fast enough towards the CPU to keep the cores busy. And the fact that your simulations now take 5 times longer. And of course you already saw memory usage close to 100%

tl;dr: install more memory or reduce the cell count of your simulations
Or try to find other running programs that use a significant amount of memory and close them
evcelica and Mmn11 like this.
flotus1 is offline   Reply With Quote

Old   October 20, 2022, 03:07
Default
  #3
New Member
 
Bradley
Join Date: Oct 2022
Posts: 1
Rep Power: 0
Brad93 is on a distinguished road
Hello,

I have a small question, how do I know if I can close a running program that uses a large amount of memory. I am always a little afraid that closing them will cause problems with the operation of my PC.
__________________
My website : Hentai Porn Movie

Last edited by Brad93; October 27, 2022 at 06:52.
Brad93 is offline   Reply With Quote

Old   October 21, 2022, 20:33
Default
  #4
Senior Member
 
Will Kernkamp
Join Date: Jun 2014
Posts: 343
Rep Power: 13
wkernkamp is on a distinguished road
Only if it is an operating system related component. Otherwise, you can close anything without a problem. (Except for unsaved info)
wkernkamp is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
General recommendations for CFD hardware [WIP] flotus1 Hardware 19 Yesterday 18:02
Issues with poor performance in faster CPU gian93 Hardware 9 October 29, 2018 13:34
Superlinear speedup in OpenFOAM 13 msrinath80 OpenFOAM Running, Solving & CFD 18 March 3, 2015 05:36
Star cd es-ice solver error ernarasimman STAR-CD 2 September 12, 2014 00:01
OpenFOAM 13 Intel quadcore parallel results msrinath80 OpenFOAM Running, Solving & CFD 13 February 5, 2008 05:26


All times are GMT -4. The time now is 10:21.