|
[Sponsors] |
December 2, 2017, 03:41 |
Hyper-Threading question
|
#1 |
New Member
hyhui
Join Date: Jul 2017
Posts: 19
Rep Power: 8 |
Hello everyone,
I have a question about the Hyper-Threading . When i enable the Hyper-Threading of the workstation with 12 cores and 24 threads, the calculate speed of Converge case slow down compare to disable the Hyper-Threading. So i am confused that why it slow down when the Hyper-Threading is used? Did you met this situation? Is there any solutions? Maybe it is recommended disabled the Hyper-Threading when use Converge? Thanks for your help! Sincerely! hyhui |
|
December 2, 2017, 06:58 |
|
#2 | |
Senior Member
Tobias
Join Date: May 2016
Location: Germany
Posts: 264
Rep Power: 10 |
Quote:
yes, it is recommended to disable HT. With HT, one physical core appears as two processors to the operating system, allowing concurrent scheduling of two processes per core. However, this slows down the processes. Easy way to say it, virtual cores are not as fast as physical ones, therefore the physical ones have to wait for the results calculated by the virtual ones, because load ballancing assumes equal perfomances. |
||
December 2, 2017, 07:24 |
|
#3 | |
New Member
hyhui
Join Date: Jul 2017
Posts: 19
Rep Power: 8 |
Quote:
|
||
July 12, 2018, 23:01 |
|
#4 |
Member
Join Date: Jul 2012
Location: India
Posts: 32
Rep Power: 13 |
Hi,
Where is the option to disable or use HT in Ansys Fluent? Thank you. |
|
July 13, 2018, 01:46 |
|
#5 |
Senior Member
Tobias
Join Date: May 2016
Location: Germany
Posts: 264
Rep Power: 10 |
I think that enable/disable HT can only be done in BIOS menu, not for specific applications.
|
|
July 13, 2018, 03:00 |
|
#6 |
Member
Join Date: Jul 2012
Location: India
Posts: 32
Rep Power: 13 |
||
August 14, 2018, 14:03 |
|
#7 |
New Member
Anonymous123
Join Date: Aug 2018
Posts: 5
Rep Power: 7 |
Hyperthreading is useful for simulations involving spray parcels, and can be upto 20-25% faster than when using physical cores, but this gain in speed is only during the duration of spray. Make sure you use the command '--t' in cmd while starting simulation to enable hyper-threading in converge. I dont know about the impact of this in a cluster based computer but this certainly is effective in workstations.
|
|
May 20, 2021, 06:58 |
|
#8 | |
Member
UOCFD
Join Date: Oct 2020
Posts: 40
Rep Power: 5 |
Quote:
Can you explain why is it useful for solving parcels?? I have read OF does not take advantage from hyperthreading. |
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Question about symmetry in Autodesk Cfd 2016 | ecto | Autodesk Simulation CFD | 0 | October 20, 2015 04:16 |
small question about the functionalities of topological changes in OpenFoam | ngj | OpenFOAM Running, Solving & CFD | 2 | February 28, 2013 10:02 |
Question Re Engineering Data Source | imnull | ANSYS | 0 | March 5, 2012 13:51 |
internal field question - PitzDaily Case | atareen64 | OpenFOAM Running, Solving & CFD | 2 | January 26, 2011 15:26 |
Poisson Solver question | Suresh | Main CFD Forum | 3 | August 12, 2005 04:37 |