Windows 10: Is there a way to set processor affinity for a process using commands invoked from within...

I have a processor/memory -intensive program that runs twice as fast if I affiniate it to a single processor. Is there a command to perform the task that I currently do manually via task manager after having the program's initialization pause and ask me to do it manually via task manager?


Microsoft Windows 10 Pro Version 10.0.18362 Build 18362


The program is single-threaded, so doesn't benefit from having multiple logical processors, and pinning it to the highest-numbered processor tends to keep all the other processes running on the PC from disrupting its cache references. The program has access to its PID, if that helps.

:)

 

Affinity Command in CMD


How are you implementing the command? Affinity takes a hexadecimal number.
For exmaple:
processor 0: 0x1
processor 1: 0x2
processor 2: 0x4
processor 2 & 4: 0x14

You can use the calculator to get these numbers. In Programmer mode, go to the bit toggling keypad.





And before you state it. Yes this is how it worked in Windows 7 as well. Using plain decimal numbers (1-8 etc.) did not correspond to a CPU number. You just never double checked the command in task manager to make sure it set that process to the CPU you picked. I.E. using "affinity 3" did not restrict the process to processor 3. No, instead it restricted the process to CPU 0 and 1.

 

CPU / CPU Processor problems / Processor affinity

We appreciate the information you provided. Your processor is working as expected. CPU affinity is only showing CPU (0) since 1 processor is working at the moment. It's very likely that your computer is using a balanced power plan, so we suggest changing
your power plan to High Performance by following these steps:

• Right-click Start.
• Click Power Options.
• Choose High Performance.

In addition to that, we recommend installing the latest updates to keep your system current and secure. Go to
Start > Settings > Update & Security > Check for updates.

Some programs may also be automatically launching whenever you boot your computer, affecting the performance. To disable them, follow these steps:

• Right-click your taskbar.
• Click Task Manager.
• Under the Startup tab, find the programs that you don't need.
• Right-click the program and choose Disable.

You're also using your computer for a game that was designed to run on an earlier version of Windows, so it's possible that it's slowing down your computer. In this case, use the Compatibility Troubleshooter to find and fix problems with the program using
these steps:

• Click Start.
• Type Troubleshooting and press Enter.
• Click Run programs made for previous versions of Windows.
• Click Next.
• Choose the program from the list and click Next.

Let us know if you need further assistance with your computer.

 

Affinity Command in CMD

Yes, I am perfectly aware of how the hexadecimal system works with Affinity. In my case I'm trying to make said program only run on CPU 0, thus the bat file looks like this:

Code:

Code:

Start /affinity 1 program.exe

But Windows seems to ignore it, running the program with all cores. And it's not just that specific program, I've tested with multiple and it's all the same. It works just fine with the exact same command, exact same program on my Windows 8.1 PC, but not on my Windows 10.

Maybe someone with Windows 10 can test and confirm to see if I'm the only one with this problem.