Processing time: 1 WU vs 16 WU
log in

Advanced search

Message boards : Number crunching : Processing time: 1 WU vs 16 WU

Author Message
Millenium
Send message
Joined: 26 Jul 17
Posts: 14
Credit: 1,625,352
RAC: 36
Italy
Message 1634 - Posted: 12 Nov 2019, 18:50:10 UTC

Just a quick report, today I had the chance to run a single WU on a fresh OS installation.

OS: Kubuntu 19.10
CPU: AMD Ryzen 1700
RAM: 16GB (2* 8GB 2666MHz)

Running a single WU took 8,151 seconds to be completed.
Running 16 WUs together takes 12,500 seconds to complete a WU.

Nothing wrong with that, it makes sense, given the workload of the project. It is just curious to see the difference.

Jim1348
Send message
Joined: 29 Dec 16
Posts: 41
Credit: 6,027,795
RAC: 9,708
United States
Message 1635 - Posted: 12 Nov 2019, 20:08:40 UTC - in response to Message 1634.

Running a single WU took 8,151 seconds to be completed.
Running 16 WUs together takes 12,500 seconds to complete a WU.

If that single work unit was the only thing you were running, then it was running effectively on its own core. The 16 WUs were running on virtual cores (two per real core).
So that is the difference you expect between a full core and a virtual core.

Profile Buro87 [Lombardia]
Send message
Joined: 23 Nov 16
Posts: 65
Credit: 2,635,656
RAC: 433
Italy
Message 1636 - Posted: 15 Nov 2019, 22:19:44 UTC - in response to Message 1635.
Last modified: 15 Nov 2019, 22:23:47 UTC

It's not only this. TN Gridi is very memory-intensive project
At the end of tihs thread (las 6-7 post) you can see the answer from Daniel ( a project's developer) to my specific question
http://gene.disi.unitn.it/test/forum_thread.php?id=135&sort_style=8&start=150

TN-Grid love high speed RAM
@Millenium, if you can, try to overclock RAM

Millenium
Send message
Joined: 26 Jul 17
Posts: 14
Credit: 1,625,352
RAC: 36
Italy
Message 1637 - Posted: 18 Nov 2019, 17:32:45 UTC

Tried running only 2 WUs: 8,482 and 8,538 seconds.

A bit longer than just one but it can't be only due to multithread because they were only 2. Yup they were the only thing running, I left the PC alone.

Yeah it's not the first time I've heard about memory bandwidth being what bottleneck that project. I didn't save my times before I bought the second RAM DIMM, so no single channel data.

As for RAM frequency well, mine is a first gen Ryzen, 3000 would be like the max or so for it. So yeah I could try it, but nothing huge.


Post to thread

Message boards : Number crunching : Processing time: 1 WU vs 16 WU


Main page · Your account · Message boards


Copyright © 2020 CNR-TN & UniTN