LabVIEW
Bug with CPU Information
Surprised this thread got that much traction. A few things, yes to caching the result. I like UIs to be responsive, and did not appreciate the lag in my system information window when querying this value. I did not include the caching aspect here.
The System Configuration VIs work, but, there seems to be an issue with its mutex. I called the function in two different locations, non reentrant VIs, one call was for the CPU core count, the other call was to determine if there were any PXI chassis connected. Not always, but enough to easily notice, I would get a weird error from the System Configuration Initialization vi. So beware if you use that call in multiple spots.
Lastly, below and v2019 attached, is another way to get the core count. The first call to the function is also slow. This was inspired by Andrey Dmitriev's 20 year old thread. It is not pretty. 🙂 It can probably be cleaned up by a dotNET savant.
@mcduff wrote:
...
Lastly, below and v2019 attached, is another way to get the core count. The first call to the function is also slow. This was inspired by Andrey Dmitriev's 20 year old thread. It is not pretty. 🙂 It can probably be cleaned up by a dotNET savant.
Well, nowadays I'll do probably something like that:
int GetCPUinfo (int *LVtotalLogical, int *LVtotalCores, int *LVpCores, int *LVeCores)
{
SYSTEM_INFO sysInfo;
GetSystemInfo(&sysInfo);
int totalLogicalProcessors = sysInfo.dwNumberOfProcessors;
DWORD length = 0;
GetLogicalProcessorInformationEx(RelationProcessorCore, NULL, &length);
SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *buffer = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *)malloc(length);
if (!buffer || !length) return -1;
GetLogicalProcessorInformationEx(RelationProcessorCore, buffer, &length);
int totalCores = 0;
int pCores = 0;
SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *ptr = buffer;
while ((char *)ptr < (char *)buffer + length) {
if (ptr->Relationship == RelationProcessorCore) {
totalCores++;
if (ptr->Processor.Flags == LTP_PC_SMT) {
pCores++;
}
}
ptr = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *)((char *)ptr + ptr->Size);
}
int eCores = totalCores - pCores;
*LVtotalLogical = totalLogicalProcessors;
*LVtotalCores = totalCores;
*LVpCores = pCores;
*LVeCores = eCores;
free(buffer);
return 0;
}
Then
Test project (downgraded to LV2018) in the attachment, but I haven't appropriate CPU to test it.
NI CVI 2020 was used for DLL. (zip attachment with binaries wasn't accepted, therefore 7z).
Hi Andrey,
the latest CoreUltra200 come with P-cores without SMT:
And some even come with two different kind of E-cores ("low power" and "even lower power")…
