![]() However, generally, Windows is too aggressive in its core parking, resulting in high latency during bursting CPU loads, stemming from the overhead of having to unpark CPU cores. ![]() There are many factors that will determine precisely how effective it will be for a given situation. Efficacy of Disabling Core ParkingĮmpirical evidence shows that disabling CPU core parking can make a tangible improvement in system performance. Process Lasso has a similar feature with its IdleSaver. ParkControl has Dynamic Boost to allow you to set active and idle power plans. For instance, with Process Lasso, you can automatically enter ‘Bitsum Highest Performance’ will you start a game, then go back to ‘Balanced’ when you exit. ParkControl (and Process Lasso) not only let one more easily configure CPU core parking and frequency scaling, but also allow for dynamic entrance into a higher performance power plan. The new ‘Ultra Performance’ power plan copies what Bitsum did with our own ‘Bitsum Highest Performance’ power plan and finally disables core parking entirely. Even the default ‘High Performance’ power plan is not immune. Intel moved core parking control onto the chip in the Skylake generation, and AMD followed, but still the parameters of the Windows power plans are set to aggressively park CPU cores. The aggressive core parking of Windows led to a great deal of inefficiency during bursting CPU loads. Initially, core parking was controlled entirely by the operating system. ![]() Unfortunately, this power saving comes at a price: Latency when CPUs need unparked to execute code. It dynamically disables CPU cores in an effort to conserve power when idle. Lifetime licenses are one-time payments for all future updates.ĬPU Parking is a low-power sleep state (C6) supported by most modern processors and operating systems. I could wake up the PC instantly (no mainboard post messages, etc) by pressing any key on the keyboard.Entire Home licenses allow installation on up to 5 PCs based in the same home. Rundll32.exe powrprof.dll,SetSuspendState 0,1,0 seems to be doing the same thing, but somehow, the programme above did not put the computer into hibernation. SetSuspendState(FALSE, FALSE, FALSE) <- Added this actual call. #include "PowrProf.h" <- Added this to use the sleep function. #include "windows.h" <- Added this to make it work on Windows. You need to add "PowrProf.lib" to the additional dependencies of the Linker. If you do not trust me (which is totally fine) or the file has been deleted, you can compile the code yourself, Of course. ![]() I have uploaded the executable I compiled to this page (click the "SleepTest.exe"), but this file could be deleted after a while (this is a free file hosting site that I just found by a quick Google search). I could not wake up the PC using the keyboard I had to press the power button, and the PC showed the mainboard post messages, etc.Īfter reading the Windows API document, I created a very simple programme with just 3 lines of typing. I have created a shortcut for rundll32.exe powrprof.dll,SetSuspendState 0,1,0 (also tried with 0,0,0), but running the shortcut seemed to put my PC into hibernation. Set "s3=public static void PowerSleep()' add-type -name Import -member $m -namespace Dll ::PowerSleep() " Set "s2=static extern bool SetSuspendState(bool hibernate, bool forceCritical, bool disableWakeEvent) " So here's my simple power_sleep.bat: off &mode 32,2 &color cf &title Power Sleep There are so many " proper" solutions proposing external tools, yet I can't seem to find a native (hybrid / pinvoke / whatever) batch script, even if this question has remained active over the years. But that's the nature of Windows - a black box that people have poked around and found hundreds of workarounds to get a job done (shout-out to dostips). Shutdown.exe /? shows all choices to shutdown / restart / advanced options boot / firmware boot.īut I see so much bashing thrown around about the Sleep part.Įverybody gets it that rundll32.exe should not be used to call random functions and it just works here for hibernate entirely by coincidence. The shutdown part of the question is clear for everybody.
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