PC Processors

[chrisclk]

On Windows 10, I call GetLogicalProcessorInformationEx(RelationGroup, Buffer, &Length);

The return data is that there are two groups with 32 logical processors in each group. I was expecting 64 logical processors in each group.

What are the reasons that this might be happening?

[elstaci]

It will be extremely helpful to know your computer specs especially the Make & Model of your CPU and Motherboard and Windows version you have installed before, at least in my case, I can give you an applicable reply.

[chrisclk]

Its running on an AMD 3990X 64 core cpu. The system is running Windows 10, don't know the version number.

I don't have details on the motherboard etc. as I don't own the computer. I am debugging an application running on someone else's computer. I will get the motherboard/Windows version.

[elstaci]

Download SPECCY which will give most of your computer's hardware and software installed.

What does Windows Task Manager show under "Processor"?

[misterj]

chrisclk, SPECCY is probably the worst utility you can use.  Please post the the actual output of your command.  Thanks and enjoy, John.

EDIT: Please run the PowerShell command get-computerinfo in an elevated command prompt and post the results.  The output will contain some personal information information, so I recommend editing before posting.  Please tell us if this is what you are looking for and if not, what is.

I assume you are running on the HW and not on Hyper-V?

Please run the utility (MS) CoreInfo from Sysinternals and post the output (check for private info)

[elstaci]

This website give you several ways to check your PC Hardware and software using Windows plus a couple of 3rd party APPs which they recommend which happens to contradict the other User's misinformed personal opinion: https://www.timeatlas.com/check-computer-specs/

EDIT: Found this GITHUB Thread with a similar issue as the one your having with the same processor: https://github.com/giampaolo/psutil/issues/1809

[chrisclk]

This is the processor/motherboard info:

Operating System
Windows 10 Pro 64-bit
CPU
AMD Ryzen Threadripper 3990X 44 °C
Castle Peak 7nm Technology
RAM
64.0GB Unknown @ 1064MHz (15-15-15-36)
Motherboard
ASUSTeK COMPUTER INC. ROG ZENITH II EXTREME ALPHA (sTRX4) 39 °C

The github thread seems to be about the known Windows limitation in that there are a maximum of 64 logical processors in a single group, so the 3990X 128 threads cannot be represented in a single group. The GetLogicalProcessorInformationEx call returns the two groups but does not return 64 logical processors in each group.

[misterj]

chrisclk, please answer my previous questions ans see this thread.  This concerns Hyper-V which does have a problem here.  That is why I asked about it.  There is a screenshot of the task manager running all 128 logical processors.  Please post the same shot of yours.  Thanks and enjoy, John.

[elstaci]

Thanks that should help other Users in assisting your problem.

If you don't get a satisfactory answer in this thread then try opening a AMD Service Request (Official AMD SUPPORT) from here: https://www.amd.com/en/support/contact-email-form

It may take them a couple of days to respond though.

Just for your FYI in case you hadn't seen this before in the past, Microsoft explanation of the function you are using: https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getlogicalprocessorinfor...

[chrisclk]

Thanks for all your help with this.

I think I have discovered the issue. A 64 bit process returns 64 processors per group and a 32 bit process returns 32 processors per group. I was aware that the affinity bitmap is a problem for a 32 bit process as the bitmap is only 32 bits wide, but I thought the function could still return the number of processors. I am going to try using bcdedit to create 4 groups of 32 processors and see if a 32 bit process works properly with that.

[elstaci]

I will take your word for your possible solution :smileyvery-happy:

I guess you are talking about this from the link I provided in my previous reply:

Which seems to be what you are talking about.

Hope you BCDEDIT helps finally to solve your problem.

Good luck and take care.