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- Use the Windows system function to determine the number of physical CPU cores.

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The generic version does not appear to work as intended.
This commit is contained in:
Christoph Oelckers 2018-03-13 20:04:41 +01:00
parent d83456e9cc
commit 49f590c797
1 changed files with 37 additions and 0 deletions
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37
src/d_stats.cpp
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@ -185,12 +185,49 @@ static int GetOSVersion()
#endif #endif
} }
#ifdef _WIN32
static int GetCoreInfo()
{
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = NULL;
DWORD returnLength = 0;
int cores = 0;
uint32_t byteOffset = 0;
auto rc = GetLogicalProcessorInformation(buffer, &returnLength);
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)malloc(returnLength);
if (!GetLogicalProcessorInformation(buffer, &returnLength)) return 0;
}
else
{
return 0;
}
ptr = buffer;
while (byteOffset + sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) <= returnLength)
{
if (ptr->Relationship == RelationProcessorCore) cores++;
byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
ptr++;
}
free(buffer);
return cores < 2 ? 0 : cores < 4 ? 1 : cores < 6 ? 2 : cores < 8 ? 3 : 4;
}
#else
static int GetCoreInfo() static int GetCoreInfo()
{ {
int cores = std::thread::hardware_concurrency(); int cores = std::thread::hardware_concurrency();
if (CPU.HyperThreading) cores /= 2; if (CPU.HyperThreading) cores /= 2;
return cores < 2? 0 : cores < 4? 1 : cores < 6? 2 : cores < 8? 3 : 4; return cores < 2? 0 : cores < 4? 1 : cores < 6? 2 : cores < 8? 3 : 4;
} }
#endif
static int GetRenderInfo() static int GetRenderInfo()
{ {