Windows 10 CPU Scheduling

Ndimz · Aug 18, 2015

Hello there peeps

I've been experiencing some serious lag on Watchdogs on Win 10 which I never had on Win 8.1. Seemed queer how at one moment all was fine (performance wise) and just after my upgrade to the new MS OS my programs seemed somewhat delayed responsive. I checked Advanced system settings and CPU scheduling was set for Background services? Is this some new implementation by MS?

Regards

Ndimz

tsunami231 · Aug 18, 2015

mine is set to programs, by default less Samsung SSd magician set it to that when pick max performance for the ssd in it

CCoR- · Aug 19, 2015

Mines set to programs too

umeng2002 · Aug 19, 2015

Every time you attack a minority in the game, Windows 10 sends that telemetry data to FBI to update your Federal Profile.

Seriously though, I've never seen a difference in performance between programs and background services. You would be quick to blame Windows, but it's usually the newer drivers made for Windows 10.

mbk1969 · Aug 19, 2015

From "Windows internals" by Mark Russinovich, David A. Solomon, Alex Ionescu

Quantum
As mentioned earlier in the chapter, a quantum is the amount of time a thread gets to run before Windows checks to see whether another thread at the same priority is waiting to run. If a thread completes its quantum and there are no other threads at its priority, Windows permits the thread to run for another quantum.
On client versions of Windows, threads run by default for 2 clock intervals; on server systems, by default, a thread runs for 12 clock intervals. (We’ll explain how you can change these values later.) The rationale for the longer default value on server systems is to minimize context switching. By having a longer quantum, server applications that wake up as the result of a client request have a better chance of completing the request and going back into a wait state before their quantum ends.

Controlling the Quantum
You can change the thread quantum for all processes, but you can choose only one of two settings:
short (2 clock ticks, which is the default for client machines) or long (12 clock ticks, which is the default for server systems).
To change this setting, right-click on your Computer icon on the desktop, or in Windows Explorer, choose Properties, click the Advanced System Settings label, click on the Advanced tab, click the Settings button in the Performance section, and finally click on the Advanced tab.
The Programs setting designates the use of short, variable quantums—the default for client versions of Windows. If you install Terminal Services on a server system and configure the server as an application server, this setting is selected so that the users on the terminal server have the same quantum settings that would normally be set on a desktop or client system. You might also select this manually if you were running Windows Server as your desktop operating system.
The Background Services option designates the use of long, fixed quantums—the default for server systems. The only reason you might select this option on a workstation system is if you were using the workstation as a server system. However, because changes in this option take effect immediately, it might make sense to use it if the machine is about to run a background/server-style workload. For example, if a long-running computation, encoding or modeling simulation needs to run overnight, Background Services mode could be selected at night, and the system put back in Programs mode in the morning.
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Windows 10 CPU Scheduling

Ndimz Active Member

tsunami231 Ancient Guru

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umeng2002 Maha Guru

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