PrimeGrid
Please visit donation page to help the project cover running costs for this month
1) Message boards : Number crunching : Linux & Hyperthreading (Message 93823)
Posted 1349 days ago by Profile [AF>Libristes]Maeda
No, I set 100% CPU time, but 80% of multiprocessors, resulting in using 6/8 virtual CPU.
2) Message boards : Number crunching : Linux & Hyperthreading (Message 93813)
Posted 1349 days ago by Profile [AF>Libristes]Maeda
Well, I'm doing some couple of tests. HT does NOT run 5 WU at the same time (percentages are pausing somehow).
5 WU on 3 physical CPU means never have 100% CPU per WU.
3) Message boards : Number crunching : Linux & Hyperthreading (Message 93810)
Posted 1349 days ago by Profile [AF>Libristes]Maeda
But LLR is not the main goal of my computer, i'm running several projects, and several type of WU (LLR / CPU intensive, but also other not affected by HT).
With HT enabled means more time to complete WU, but executing 5 WU at the same time. The ratio between 5 at a time @3.4GHz and 3 at a time @ 3.8GHz, the overall more job is done with 5 at a time. I'll go with the #1 option then.
And if I only have to do LLR WU, i'll switch to #2 option :).
4) Message boards : Number crunching : Linux & Hyperthreading (Message 93797)
Posted 1349 days ago by Profile [AF>Libristes]Maeda
Hi !

I was wondering too, if I have to turn off HT or not.

Because of heat, here are my options :
    #1 With HT enabled, I can run 5 WU at the same time @3.4GHz each (turbo mode disabled)
    #2 With HT disabled, I can run 3 WU at the same time @3.8GHz each (turbo mode enabled)



What's the best option to take ?

Now I'm with option #2 (because WU are faster), but I'm wondering if spending long hours of job done will results in better work done with option #1.

Any advice ?
Thanks.

5) Message boards : Generalized Fermat Prime Search : Deprecating GeneferCUDA (Message 93328)
Posted 1364 days ago by Profile [AF>Libristes]Maeda
Reporting results here, as expected the two cpuGFN20 without HT completed in 31.5 hours and 32.4 hours.
I turn HT on again.

I found another topic "LLR and HT", and it seems that it's only on Windows based system that makes a difference.
6) Message boards : Generalized Fermat Prime Search : Deprecating GeneferCUDA (Message 93189)
Posted 1368 days ago by Profile [AF>Libristes]Maeda
OK but I get "Seg fault" as a results with those two commands.

P.S. : it seems that WU now running GFN20cpu without HT are estimated 33hours (same as HT enabled).
7) Message boards : Generalized Fermat Prime Search : Deprecating GeneferCUDA (Message 93139)
Posted 1369 days ago by Profile [AF>Libristes]Maeda
Well, thanks for those great explanations, I have some CPU time for GFN, for example : GFN20 (3.09) 32 hours to complete. I'll try without HT and see results.

And be sure that my old GT 430 will be on Sieve tasks, as it's my second graphic card Boinc dedicated.
8) Message boards : Generalized Fermat Prime Search : Deprecating GeneferCUDA (Message 93134)
Posted 1369 days ago by Profile [AF>Libristes]Maeda
You've asked a really good question here. Suggesting that the GT 430 is getting a bit long in the tooth would be insulting long teeth. It's fairly old, and even when brand new was at the bargain-basement end of Nvidia's product line.

OK I think that's why I turned off GPU for GFN.
[...] effectively turning off hyperthreading, and you'll be running GFN tasks fairly quickly. I'd say away from GFN-22's, because they're so long.

50% to get some CPU for myself :).
I should turn off hyperthreading ? What benefits ?
They will probably take about 3 weeks or more on your CPU. The n=21 tasks would be about 4 times shorter.

Well, my cumputer don't work 24/7. If the deadline is OK, I can crunch long tasks, but if the deadline need full day on it, I won't do it.
There's 9 different sizes of GFN tasks to choose from, but only some of them (22, 21, and for at least a few more tasks, 20 and 19) will be able to use the full abilities of your CPU. The other N's have to use slower transforms.

The last (22) is very long indeed. I think all others are OK.
I keep my old GPU for easiest tasks (Sieve or other projects) then.
9) Message boards : Generalized Fermat Prime Search : Deprecating GeneferCUDA (Message 93129)
Posted 1370 days ago by Profile [AF>Libristes]Maeda
I remember now, I switched to GFN CPU, I leave Sieve as CUDA's app.
Well, should I test first if GFN CUDA's working before testing OCL GFN app ?

I did had a previous GFN problem but I changed both system and hardware (but not the graphic card).

Before trying to fix something, do you think that if I run GFNcpu app with an Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz, it's better than an old (CUDA or OCL) GPU GT430 ?

I don't remember if I try both :/. Maybe should I continue with GFNcpu :)
10) Message boards : Generalized Fermat Prime Search : Deprecating GeneferCUDA (Message 93123)
Posted 1370 days ago by Profile [AF>Libristes]Maeda
Hi !

Just tried OCL app (GFN16) instead of CUDA with my Nvidia GT430 (no oc), compute capability = 2.1..
It's very fast !! 14min to get... an error while computing.

On Boinc's events, it's returning the results and then say that if I get errors repeatly I should reset the project.

Any advice ?
For now, I stay on CUDA.
Thanks.


Next 10 posts
[Return to PrimeGrid main page]
DNS Powered by DNSEXIT.COM
Copyright © 2005 - 2019 Rytis Slatkevičius (contact) and PrimeGrid community. Server load 1.29, 1.06, 1.26
Generated 14 Dec 2019 | 18:54:45 UTC