2 hours ago, FBW737 said:

I'm not going to post an image because its a pain the, but I made a HT on to HT off Comparison my 10900K system and to my surprise nearly 10% higher FPS with HT off!

I set up a static eternal view of the A330 at a gate in KLAX at 10:40am with Few Clouds theme. Used CapFrameX for a 120 second capture. did ity with HT on and HT off.

The average FPS with HT on was 34.5 and with HT off it was 37.7

Your post made me take look at this.

I've been running my 10900K at 5.2 on water with HT on.

I parked the PMDG736 at gate C33 at JFK and set an external view.

With HT on I was seeing FPS 39 to 43 and core temps 48 to 51 degrees.

With HT off I was seeing FPS 44 to 49 and much lower core temps at 38 to 41 with the added bonus of much less fan noise.

Hopefully the sim is still smooth with no stutters.

I expect it will be but if not, reluctantly, I'll have to turn HT back on.

 

 

Out of all the suggestions I've seen here about how to make your sim run smoother, none of them have worked as well as this has. My sim is noticeably smoother after turning HT off. I'm so glad I gave this a shot and it only took 2 minutes to make the change in my BIOS, which - with modern day motherboards, is ridiculously easy. Thanks!

2 minutes ago, Bdub22 said:

Out of all the suggestions I've seen here about how to make your sim run smoother, none of them have worked as well as this has. My sim is noticeably smoother after turning HT off. I'm so glad I gave this a shot and it only took 2 minutes to make the change in my BIOS, which - with modern day motherboards, is ridiculously easy. Thanks!

What's your CPU?

34 minutes ago, Alvega said:

What's your CPU?

i7 11700K

I was intrigued...



🤔will have to see what it's like in a normal flight as that's different from a standard benchmark.
(VR, Reverb G2)

In a variation on this theme, I had been running MSFS on my 10-core 10900K with HT off.  I've observed that the main thread runs on the last core (core 9 in my case).

As an experiment I lowered my all-core overclock to 4.8 GHz from 5.1 GHz, turned HT back on, and since MSFS doesn't have a config option to manage processor affinity, I used Process Lasso to externally set an affinity mask that keeps MSFS off of the paired virtual CPU on the core running the main thread, so the main thread doesn't share its core with other threads.  In other words, Process Lasso allows MSFS to use virtual CPUs 0-18, and blocks vCPU 19 so that the core running the main thread doesn't have to share its processor time with other threads.

This is an alternative to the all-or-nothing HT on or HT off approach, and it seems to have significantly mitigated the stability issues I was having with memory access violation (0xC0000005) crashes, and without any real performance hit.

Thanks. I turned off HT and things are much smoother. 

4 hours ago, Bob Scott said:

This is an alternative to the all-or-nothing HT on or HT off approach, and it seems to have significantly mitigated the stability issues I was having with memory access violation (0xC0000005) crashes, and without any real performance hit.

The other alternative to the All or Nothing HT on or off approach is to simply turn off HT on Physical Core9 and leave it on on all the other physical cores. You can do that in the BIOS. I was actually using that approach before making the HT on on all cores OR HT off on all cores comparison. When I get around to it I'll make the comparison between HT off on all cores and HT on on all but the core that hosts the main thread thereby establishing whether I actually gained anything by turning HT off altogether. I have a feeling of deja vu. It's just like the old days! 🤪

Edited December 10, 20232 yr by FBW737

5 minutes ago, FBW737 said:

The other alternative to the All or Nothing HT on or off approach is to simply turn off HT on Physical Core9 and leave it on on all the other physical cores. You can do that in the BIOS. I was actually using that approach before making the HT on on all cores OR HT off on all cores. When I get around to it I'll make the comparison between HT off on all cores and HT on on all but the core that hosts the main thread thereby establishing whether I actually gained anything by turning HT off all together. I have a feeling of deja vu. It's just like the old days! 🤪

Per-core HT isn't possible on a 10th-gen CPU.  I can do that on my 13900KS, but not on the 10900K in my MSFS box.

3 minutes ago, Bob Scott said:

Per-core HT isn't possible on a 10th-gen CPU.  I can do that on my 13900KS, but not on the 10900K in my MSFS box.

I can do it on my 10900k!

Its probably Motherboard and BIOS dependent

Edited December 10, 20232 yr by FBW737

2 minutes ago, FBW737 said:

I can do it on my 10900k!

OK...I went back into the BIOS and looked, and sure 'nuf, you can.  I stand corrected--and I'm gonna try that next!

30 minutes ago, Bob Scott said:

OK...I went back into the BIOS and looked, and sure 'nuf, you can.  I stand corrected--and I'm gonna try that next!

I really wonder, imagine if you had only two cores but both had hyperthreading, what would the difference be between running one core with HT (two threads), or both cores without HT (still two threads in effect).  Anyone hazard to take a guess?

I am thinking apart from higher temps on the hyperthreading core, not much difference really. 

1 hour ago, Bob Scott said:

OK...I went back into the BIOS and looked, and sure 'nuf, you can.  I stand corrected--and I'm gonna try that next!

I have the 10850K and it made a big difference. Hope it helps. 

1 hour ago, bobcat999 said:

I really wonder, imagine if you had only two cores but both had hyperthreading, what would the difference be between running one core with HT (two threads), or both cores without HT (still two threads in effect).  Anyone hazard to take a guess?

Sure.. Two real cores gives you two times 1 CPU core in computing power.  One core with HT gives you one CPU core in computing power.. half of the first.

13 hours ago, Bob Scott said:

In a variation on this theme, I had been running MSFS on my 10-core 10900K with HT off.  I've observed that the main thread runs on the last core (core 9 in my case).

As an experiment I lowered my all-core overclock to 4.8 GHz from 5.1 GHz, turned HT back on, and since MSFS doesn't have a config option to manage processor affinity, I used Process Lasso to externally set an affinity mask that keeps MSFS off of the paired virtual CPU on the core running the main thread, so the main thread doesn't share its core with other threads.  In other words, Process Lasso allows MSFS to use virtual CPUs 0-18, and blocks vCPU 19 so that the core running the main thread doesn't have to share its processor time with other threads.

This is an alternative to the all-or-nothing HT on or HT off approach, and it seems to have significantly mitigated the stability issues I was having with memory access violation (0xC0000005) crashes, and without any real performance hit.

I also use Process Lasso. Process Lasso is the best way in my opinion as it's so flexible and so easy to use, no need to go into bios to turn HT on or off, you can choose to have HT on or off on a per Application basis, and once you have decided what cores and hyperthreading mode you would like an application to use, Process Lasso remembers your settings for that app and will automatically apply them when you boot up your desired program. 

 

I use it to allocate some of my e-cores on my 13600KF to run external apps like one e-core assigned to FS Realistic Pro, another e-core to run FSLTL, another e-core to run AnyoneFly etc etc.

You can also tell Process Lasso to always run MSFS with High Priority all the time with one simple click, or instantly make MSFS use maximum performance CPU mode with one click etc.

I would argue it's almost indispensable if you are running a 12/13/14 series intel.

It's also handy for non MSFS related gaming stuff, a few examples:

Star Wars Empire at War rts game.  There are a load of great community mods for this old game, but it runs really poorly on my 13600KF as it was only really designed to run dual-core so you get about 10 frames a second.  With Process Lasso I just set the game to use 2 cores and bang. 60fps smooth as silk. Fire and forget, I never have to bother setting the affinity for that game ever again whenever I run it.

 

Assassins Creed Odyssey,  When the game loads up under normal circumstances on my 13600KF, it doesn't appear to enable any of my e-cores.  Now the game still runs great apart from randomly freezing for 5 seconds when you are playing. No rhyme or reason to it, just completely random.  It never crashes just freezes for 5 seconds then carries on as normal.  I use Process Lasso to enable all my cores for the game, and it now runs butter smooth all of the time. No more freezing.

Edited December 11, 20232 yr by 4L0M