MyPC8MyBrain 273 Posted October 19, 2015 Report Share Posted October 19, 2015 so we got another one of those magic tricks to increase performance in P3Dv3its just started on AVSIM; worth keeping an eye on the claim is that HT OFF will save 500MB VAS and increase FPS.As you know I'm extremely skeptical about "magic bullets" and have explored many of them over the last decade ... however, this "finding" came to me from Saul (LM moderator using the same CPU I have) who was reading a post by Aviator1979 here: http://www.prepar3d.com/forum/viewtopic.php?f=6312&t=114987Since I had just done some VAS testing earlier in and around Aerosoft's EGLL, I thought I'd put the HT OFF claim to the test. To my surprise I was able to confirm the 500MB VAS savings and a 22% FPS increase.Here is the scenario I used:Prepar3D V3Aerosoft Heathrow (EGLL)Orbx FTX GlobalOrbx OpenLC EUPILOT's FS Global 2010 FTX Edtion MeshFSDT GSX ground services (active)Active Sky Next (ASN) Weather Engine (Archive weather 10/18/2015)Majestic Dash-8 Q400MyTraffic 6 - 2015 scheduleFSUIPCGoFlight Interface ToolGraphics Settings used: http://www.robainscough.com/P3DV3_Settings_Very_Low.htmlCPU used: 5960XDo NOT use any affinity tweaks (temporarily remove them if you have them).Departing gate 108 at EGLL - 11:17 AM - Take note of VASTaxi to runway 09L (departing east)Take off and climb to 20,000 FT - DTO to MEDWYAt MEDWY, come back to PILOK then D113B for landing(if you miss approach just come back around and land on 09L)Park at Gate 188 or 186Shutdown and evoke GSX deboarding - Take note of VASIf you have FRAPS then log time frame data to fileRun this scenario with HT ON and then again with HT OFF and report back and be sure to indicate what type of CPU you have.I'll post my video's with my findings tomorrow (uploading them now), but would like to hear from others.Cheers, Rob. http://www.avsim.com/topic/476776-500mb-vas-reduction-and-increase-fps-by-22-in-v3-need-some-testers/ Link to post Share on other sites
Kevin Firth 114 Posted October 19, 2015 Report Share Posted October 19, 2015 From a reputable source ofc but I dont understand how it apparently has that impact :s Link to post Share on other sites
MyPC8MyBrain 273 Posted October 19, 2015 Author Report Share Posted October 19, 2015 join the rest of us 1 Link to post Share on other sites
mutley 4,498 Posted October 19, 2015 Report Share Posted October 19, 2015 Skeptical +1 but I have always had Hyper Threading switched off, still enjoying P3Dv3 a lot! Thanks for the HU and sharing Chris Link to post Share on other sites
MyPC8MyBrain 273 Posted October 20, 2015 Author Report Share Posted October 20, 2015 here's Rob's latest video that confirms this Link to post Share on other sites
Christopher Low 63 Posted October 20, 2015 Report Share Posted October 20, 2015 Is HT on by default with CPUs? If so, which CPUs have it? I have an i5 4690k. Link to post Share on other sites
needles 1,013 Posted October 20, 2015 Report Share Posted October 20, 2015 Chris, Your particular cpu does not appear to have HT available. If you have a look at the Intel website and the range of CPUs, it tells you there which CPUs have HT. 1 Link to post Share on other sites
Christopher Low 63 Posted October 20, 2015 Report Share Posted October 20, 2015 Based on the OOMs I have suffered in FSX and P3D in the past, I can only assume that my i5 4690k (and the i5 2500k before it) were somehow emulating HT Link to post Share on other sites
mutley 4,498 Posted October 20, 2015 Report Share Posted October 20, 2015 I thought my HT wasn't activated, but it was, I disabled it and trying it out at the moment, the jury is still out but as I had no issues before it is going to be difficult to compare. Link to post Share on other sites
MyPC8MyBrain 273 Posted October 20, 2015 Author Report Share Posted October 20, 2015 usually HT is on by default in all new systems! (bios settings) when you hit task manager performance tab and you see more than one cpu graph; that means HT is on (unless you have physical dual cpu) you should be able to visually confirm the gains than scientifically using Process Explore back that up Link to post Share on other sites
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