Thus, loading up threads 1 and 2 will offer inferior performance to loading up the two distinct physical cores of 1 and 3. threads 1 and 2) share computational units. For instance, threads 1 and 3 would be physical cores, while cores 2 and 4 would be logical cores attached to physical cores 1 and 3, respectively.Įach logical CPU core pair (e.g. If you use Process Lasso, you'll want to use 'CPU Sets' rather than affinity because setting the affinity on game startup will cause some games to crash. Then fill in this line under target (desctopshortcut card): ComSpec /C Start 'RSI Launcher' /High /Affinity 5555 'YOUR LOCATION OF RSI Launcher.exe'. When Hyper-Threading/SMT is enabled, you can consider every other CPU core as physical, and the interlaced ones as logical. But there is a solution without having to deactivate your eCores in Bios or without using tools like Process Lasso: Right click on the RSI Launcher and hit properties. It will allow you to compare the relative performance of threads running on specific CPU cores. To aid you in determining the actual performance capabilities of your logical CPU cores, you can use our nifty ThreadRacer tool. Bulldozer) it is the only way to completely disable use of paired cores. The latter lets you restrict use of of non-physical cores to only applications that need real-time performance, without disabling Hyper-Threading entirely, and for some older AMD architectures (e.g. You can either disable Hyper-Threading at the UEFI (BIOS) level, or dynamically, per-process, with Process Lasso’s Hyper-Threaded Core Avoidance. Still, sometimes it is preferred to disable Hyper-Threading to ensure consistent application performance, particularly in real-time applications. You can observe this in the way it interleaves thread utilization across logical CPU cores. However, in the past several years, both Intel and AMD have changed their architectures, and the Windows CPU scheduler is very aware that it needs to prioritize thread scheduling to real CPU cores first. Further complicating matters, the Windows CPU scheduler was not fully aware that it needed to first utilize real CPU cores before loading up Hyper-Threaded logical CPU cores. When Hyper-Threading was first introduced, its logical cores were little more than an add-on, providing as little as 10% of the performance of a real CPU core. For security, given recent MDS ( Microarchitectural Data Sampling) side-channel attacks, MAYBE. Should I Disable Hyper-Threading?įor performance, generally NO. Otherwise, those hardware resources might be sitting idle and unused. This allows for more efficient use of computational resources on the CPU die since two distinct software threads have the opportunity to utilize them at any given time. If neither of the paired cores needs to use the same CPU resources, then they can run simultaneously. Gaming Mode further features AUTOMATIC STEAM GAME DETECTION and more. It does this by sharing computational units of the physical CPU core between the two virtual CPU cores. Now Process Lasso offers a power plan pre-configured for maximal performance. Symmetric Multi-Threading (SMT), also known as Hyper-Threading, exposes two logical CPU cores for every physical CPU core.
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