任务管理器从哪里提取 GPU 和 CPU 的指标？

Question

I have been trying to get details from WMI to be able to replicate the task manager tabs for GPU metrics

I have settled on the following WMI classes to get some details which are shown in the

• \\<machine-name>\ROOT\CIMV2:Win32_VideoController for the driver details
• \\<device-name>\ROOT\CIMV2:Win32_PerfFormattedData_GPUPerformanceCounters_GPUEngine for the GPU utilization information
• \\<machine-name>\ROOT\CIMV2:Win32_PerfFormattedData_GPUPerformanceCounters_GPUAdapterMemory class for the shared and dedicated memory utilization

However, the last 2 classes mentioned do not provide the metrics mapped to a named GPU identifier. Instead these are mapped to a LUID

I am still not sure where Task Manager gets the details for the Total Dedicated Memory as I have not found any class or property exposing the same reliably. I know the total shared memory is calculated as TotalPhysicalMemory/2

Where is Task Manager getting all these data and how is it mapping it to the particular GPU (As there can be multiple GPUs in a machine)?

I have come across a blog post that tells how some of the metrics are calculated, but it does not say where the date is captured from: https://devblogs.microsoft.com/directx/gpus-in-the-task-manager/

Answer 1

GPU and CPU speeds can be accessed by using Perfmon (performance counters). You can speed information, read/write etc.,.. It is also an alternative to using WMI.

However, the CPU and GPU are also dependent on the vendor. Which means if the manufacturer has not released documentation you will not be able to accurately pull the information needed.

Take temperature for example. Many vendors keep the documentation non existent to developers, some vendors welcome the development on documentation.

So it boils down to the information you want versus what is available. Most CPU and GPU information is limited and depends on the vendor.

I ran into this a few years back with the CPU temp. I could get the temp from one PC and not another. Found out it relies on the vendor and disclosure.

Basic information you can get as percentage, read/write and so forth. So be sure to see documentation for vendors and you may have to make a list of different vendors that shows which has access and which doesn't.