Hyperthreading for P3D. Yes or no?

[Guest]

4 Core CPU HT ON

6 core CPU HT ON/OFF (experiment) ... if you can get a significant increase in CPU frequency with HT OFF then go that route

8+ core CPU HT OFF

That's been my experience so far with P3D and XP11 and AF2.

HT/SMT has been around for a long time, the effectiveness of HT can be very application specific and how much is being threaded relative to available resources ... a long read from NASA Ames research paper here: https://www.nas.nasa.gov/assets/pdf/papers/saini_s_impact_hyper_threading_2011.pdf  there conclusion was HT good for 3 apps, bad for 1 app and needed more investigation on power and thermal efficiency.

Cheers, Rob.

Edited December 14, 2018 by Guest

[lownslo 592]

2 hours ago, jabloomf1230 said:

Although I agree with the theory that HT either on or off makes very little difference in P3d4. It's a matter of personal preference, since everyone's hardware and software is different.

QFT!  It's not just about P3D... which ran fine on all LP's with HT ON or all 6 cores with HT OFF during the first week after I installed 4.4.  Then, HT ON of OFF made no difference... the sim ran just great!  But adding all the stuff we all want to run along with the sim can change how all that works, and then it's incumbent upon us to manage the resources we have to create the best experience for ourselves.  It's not about old technology vs. new, or HT On for X number of cores and OFF for Y number of cores.  Just make the system work it's best for you... and allow others to do the same for themselves.

Greg

[Mace 1,909]

9 hours ago, ieydis said:

I agree with Joe on PL.  For me, much worse performance - stutters all over the place.  With my 8700K, HT Off and plays nice at 5Ghz.

 

 

Are you running 4K resolution?

[Iceman2 110]

I needed an AM for 4.3 due blurries but 4.4 I don’t get the blurs anymore so don’t use the AM.

However now after starting P3Dv4.4 I notice core 0 always runs at 100% and produces a slight stutter. I can fix this by deselecting core 0 then re-selecting it again. Everything then runs like silk on my 6700k. 

4.4 seems quite different.

[newtie 533]

1 hour ago, Iceman2 said:

I needed an AM for 4.3 due blurries but 4.4 I don’t get the blurs anymore so don’t use the AM.

However now after starting P3Dv4.4 I notice core 0 always runs at 100% and produces a slight stutter. I can fix this by deselecting core 0 then re-selecting it again. Everything then runs like silk on my 6700k. 

4.4 seems quite different.

Is core selection done through the task manager, PL or...

Cheers,

Mark

[SierraDelta 1,342]

I dropped using a P3D AM setting when P3Dv4 was launched, but I do believe that it's good practice to keep add-on programs away from Core 0. No need to use Process Lasso, batchfiles etc. since FSUIPC5 has an often overlooked function to do this for you, such as:

[Programs]
Run1=CLOSE,AM=4,D:\Program Files (x86)\HiFi\AS_P3Dv4\AS_P3Dv4.exe
Run2= ...

Pretty self-explanatory, but you can look in the FSUIPC5 for Advanced Users manual for all the details of how to use.

[Skywolf 992]

4 minutes ago, SierraDelta said:

I dropped using a P3D AM setting when P3Dv4 was launched, but I do believe that it's good practice to keep add-on programs away from Core 0. No need to use Process Lasso, batchfiles etc. since FSUIPC5 has an often overlooked function to do this for you, such as:

[Programs]
Run1=CLOSE,AM=4,D:\Program Files (x86)\HiFi\AS_P3Dv4\AS_P3Dv4.exe
Run2= ...

Pretty self-explanatory, but you can look in the FSUIPC5 for Advanced Users manual for all the details of how to use.

This is cool....

[Iceman2 110]

3 hours ago, newtie said:

Is core selection done through the task manager, PL or...

Yes newtie that’s how I do it. What’s strange, after deselecting core 0 unpausing the SIM then reselecting all cores, core 0 runs normally with the others and not at 100%. 

I’ve tried starting 4.4 with an AM that excludes core 0 but Im still getting stutters until I reselect all cores through the TM.

IM

[GSalden 4,656]

1 hour ago, SierraDelta said:

I dropped using a P3D AM setting when P3Dv4 was launched, but I do believe that it's good practice to keep add-on programs away from Core 0. No need to use Process Lasso, batchfiles etc. since FSUIPC5 has an often overlooked function to do this for you, such as:

[Programs]
Run1=CLOSE,AM=4,D:\Program Files (x86)\HiFi\AS_P3Dv4\AS_P3Dv4.exe
Run2= ...

Pretty self-explanatory, but you can look in the FSUIPC5 for Advanced Users manual for all the details of how to use.

If you have addons who need to be started after P3D is already running and you need to wait for them to start till another addon is running , you need batchfiles.

in batchfiles you can set the time between starting the addons.

With my adon cockpit software I have set starting paused of 10-15 sec between the apps.

Edited December 15, 2018 by GSalden

[pmb 5,137]

1 hour ago, Iceman2 said:

Yes newtie that’s how I do it. What’s strange, after deselecting core 0 unpausing the SIM then reselecting all cores, core 0 runs normally with the others and not at 100%. 

This has been known for a long time. It's been even discussed at the LM forum time ago, however, LM advises against this trick as it destroys the intended Prepar3d threading behavior. It's for a reason core-0 running maxed doing all management while the others serve texture loading essentially.

BTW, I tried this ages ago and it did not pay off w.r.t fps or other improvements.

Kind regards, Michael

[Iceman2 110]

16 minutes ago, pmb said:

This has been known for a long time. It's been even discussed at the LM forum time ago, however, LM advises against this trick as it destroys the intended Prepar3d threading behavior. It's for a reason core-0 running maxed doing all management while the others serve texture loading essentially.

BTW, I tried this ages ago and it did not pay off w.r.t fps or other improvements.

Kind regards, Michael

Thanks for the info.

Its only in 4.4 that I’ve noticed core 0 max’d out. But for now this method is my only remedy for the stutters.

I’ll keep tweaking and see if I can find another solution. 

[virtualstuff 758]

19 hours ago, G-YMML1 said:

What is the general consensus regarding HT usage for P3D? I have been using it ON with my 6700k and modest 4.6 OC, but now I'm planning to reach 5.0 OC with 9900k. However, there is a vast majority of comments that stable 5.0 OC on 9900k is reachable with HT off only. Hence, I'm wondering whether P3D does benefit from HT. If it does, then perhaps I should curb my enthusiasm and stick with 4.8.  

Thanks

Dmitriy

HT=ON and smooth,,,makes no sense to turn it off only if you don;'t have a clue what you are doing 😉

[Ray Proudfoot 8,952]

2 hours ago, GSalden said:

If you have addons who need to be started after P3D is already running and you need to wait for them to start till another addon is running , you need batchfiles.

in batchfiles you can set the time between starting the addons.

With my adon cockpit software I have set starting paused of 10-15 sec between the apps.

There are alternatives to batch files. SimStarterNG has the option to start a program only when P3D is ready. And you can do the same with FSUIPC5 using the Run option.

[Langyboy63 22]

Lasso does for me, as I said all this batch file milarky isnt for me, adding AM's to CFG isnt for me.

If it isnt broke.

[GSalden 4,656]

2 hours ago, Ray Proudfoot said:

There are alternatives to batch files. SimStarterNG has the option to start a program only when P3D is ready. And you can do the same with FSUIPC5 using the Run option.

Batchfiles start apps from within Windows with the choosen affinity settings.

All other apps push the affinity settings..

Steve W has written about that several times. Just use Search.