Steve I am using HT on and 340 on my six core but for some reason on an hour fight the ground textures turn to blur and mud and I loose all definition. Is this to do with my core setting?

 

This is with Global and Pago Pago and no photo scenery that I am aware of. 

 

It certainly will be. I get this when i move Prepar3d away from the first core. But I'm on a four core 4790k. At the moment I'm running 85 which seems to be good (01010101). But it will be different for a six core.

@Mike. You need proper results of fps and rate of change of fps. Also none of those HT enabled AMs are any good. Try 1360=(00,00,01,01,01,01,00,00);

 

@Paul. If you've got HT enabled and a 6 core, you won't be able to get better performance with 340. This is giving four cores to the sim without much chance of contention, and what those owning four cores dream about. Your blurry textures may be something else like mesh resolution eats away at LOD.

 

Incidentally, those hearing talk about core parking need not worry, it only effects non utilised COREs or CPUs. And so none of the configurations recommended provide any under utilised cores to sleep.

 

@Robert. Any program that runs on the same core as the first sim thread, will cause the sim to share time of that core with the other process. This often produces what appears to be faster fps, but it's found not to when the true output from the GPU is monitored, since it sawtooths.

 

 

...the GPU has time during the lee side of the sawtooth to catch back up and appears to be running slightly faster, the faster time being shown on the screen, a difficult concept to grasp agreed.

What AM did you use with HT enabled Rob? Can you try one that provides just 4 LPs with HT enabled? e.g. 340=(00,00,00,01,01,01,01,00).

 

I kept a spreadsheet of all the AM's I tested with (I'll try to dig it up) ... I didn't try ALL combination obviously, but I did use your information as a guide (340 and variants of that with 4 LPs, 5 LPs, 6 LPs, 7 LPs) to using several different AM's with HT ON, but time frame data and VAS usage data results had HT OFF no AM ended up being the best option for my 5960X.  HT OFF also generates considerably less heat at 4.625 GHz ... it was difficult to get a stable 4.625GHz with HT ON.

 

Cheers, Rob.

True, whether running the sim or not, the chip will definitely be hotter with HT enabled.

Thanks, Manny, and with HT on?

 

Jim

4 cores with HT.. and my Affinity mask is (11111101) 

 

AffinityMask=253

 

Basically the core 1 used for the main P3D and the second logical processor of core 1 is not used... all the other 3 cores are used (6 logical processors)

time frame data and VAS usage data results had HT OFF no AM ended up being the best option for my 5960X

Could well be some other ceiling at play within the hardware, but I'm uncertain. Apart from extra heat, the utilisation of HT saves around half the time the CPU spends saving registers and swapping threads, that are only doing the same thing on the same cores without HT enabled, just slower. I'll have a think.

 

Rob, what I always said; when pushing an overclock, it's about finding the final temperature through extra GHz with HT disabled, rather than staying slower with slicker thread swapping with HT on, and the main sim thread doesn't really benefit much from that, it's the way to go. You're just demonstrating that fact. Those that aren't pushing an OC need not turn off HT.

Hi Steve,

 

Ok, will do. Any reason why you are suggesting trying a different set of 4 cores for Rob and myself? I know we have the luxury of being able to make our 4 core selection in pretty much any combination we like, but you appear to be being quite specific.

 

340=(00,00,00,01,01,01,01,00)

1360=(00,00,01,01,01,01,00,00)

 

What would be the effective difference if HT is disabled and Rob and I selected the same 4 physical cores from the 8 using AM. Presumably this would give the potential CPU heat advantages while running overclocked. Or, am I still misunderstanding something....quite likely :(

 

30=0,0,0,1,1,1,1,0

60=0,0,1,1,1,1,0,0

 

Regards,

Mike

340 1360 the same thing, those are equivalents. That's what I said, use an AM with the 8 core 30 or 60 are the same thing with HT disabled.

 

 

...if you're only using four of the 8 you're not producing the heat, all eight will get warm. lol

 

 

 

...if you're only using four of the 8 you're not producing the heat, all eight will get warm. lol

 

And, just to emphasize the point, this only applies while Prepar3D is running. Other installed CPU intensive applications which are probably using all 8 physical cores/16 LP's will run the CPU overclocked significantly warmer/hotter still.

 

Mike

 

@Mike. You need proper results of fps and rate of change of fps. Also none of those HT enabled AMs are any good. Try 1360=(00,00,01,01,01,01,00,00)

 

Hi Steve,

 

Have now completed my testing and, yet again, I have to conclude that my subjective impression favours Hyperthreading - Disabled and No Affinity Mask in Prepar3D V3. This, I believe, is mirroring Rob's experience with his i7-5960X. Our Systems are very similar - same cpu, mainboard, ram, SSDs and operating system. He is currently using a TitanX whereas I have 2xSTRIX-GTX980 in SLI. Our cooling solutions also differ and his System is overclocked.

 

Perhaps there is something about the 8 cored 5960X which accounts for this difference in behaviour when compared with folks' experiences with 4 and 6 cored CPUs.

 

Anyway, I find that all 8 cores (0-7) are being used well while P3DV3 is running. This image was taken during takeoff at Seattle-Tacoma:

 

 

Regards,

Mike

I find that all 8 cores (0-7) are being used well while P3DV3 is running.

 

 

Yes, it will happily take over all your cores, but adds no more performance after 4, just eats into it.

Let's face it Mike, with 8 cores running like the clappers you need cooling. I thought the idea was to push the frequency up to the limit and by being careful with heat. Why not consider an AM like 30 or 60 with HT off?

Imagine turning on HT and you'll be getting 16 of them vying for the same time on each LP, doubling the work on each core, that'll really up the ante. No wonder HT gets a bad name.

I remember affinity masks being used 20 years ago on dual CPU SQL servers where the rear CPU had access to better cooling so the main work was targeted on that package.

 

Why not get clever with Overclocking and use an AM that only uses each corner core on the 8 core? Or do they get hotter? Or an AM that selects each alternate core like 85 or 170 with HT off?

 

Testing needs care, "subjective" doesn't cut it. I use a repeatable scenario with no randoms, no changing start time or weather, and so on, run it a couple of times to get cached up. Then take a trace of fps and rate of change of fps. I usually use a saved game on AP, with an outside view looking back over an airport just after takeoff. So that the plane flies in an arc then straightens up and capture that for a few minutes. That kind of thing. Could be there's some other ceiling with your setup, perhaps try turning off all AA features before testing, so that the GPU performance does not get in the way. The thing is, there's not much change in fps the performance lies in smooth behaviour.

Ok Steve, I have proven that AM at 340 for my six core causes texture loading problems. I replied in an earlier post that I thought it might because on an hour flight sometimes the ground textures blur toward the end of the flight. 

 

Today I set up the Aerosoft bus at Pago Pago. This scenery has several people and a few airplanes sitting around the pad. With AM at 340 I get good 47 fps but the textures load very slowly and can take a minute or two for all the planes and people to turn from black to textured. 

 

I than removed the AM setting completely (both number and text) from the config and opened the saved scenario again and lost 6 fps,,,but textures, all textures loaded almost instantly with no black items. 

 

I also reversed this procedure to eliminate any saving of loaded textures and started with no AM first and same experience.

 

So now what?

The textures load up much faster the second time. There's no chance your system relies on any more than 4 processors, none of the 4core guys would be happy.

I did reverse the process,,loaded with AM off and so textures should be loaded in memory,,than tried with AM on and still black planes and people for a minute or two.

I'm not seeing that, are you sure you got HT enabled Paul?