void CalculateProcessorTopology(CPUNumaNodes& out_nodes, uint32_t& out_numThreadsPerProcGroup)
{
out_nodes.clear();
out_numThreadsPerProcGroup = 0;
#if defined(_WIN32)
std::vector<KAFFINITY> threadMaskPerProcGroup;
static std::mutex m;
std::lock_guard<std::mutex> l(m);
DWORD bufSize = 0;
BOOL ret = GetLogicalProcessorInformationEx(RelationProcessorCore, nullptr, &bufSize);
SWR_ASSERT(ret == FALSE && GetLastError() == ERROR_INSUFFICIENT_BUFFER);
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX pBufferMem = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX)malloc(bufSize);
SWR_ASSERT(pBufferMem);
ret = GetLogicalProcessorInformationEx(RelationProcessorCore, pBufferMem, &bufSize);
SWR_ASSERT(ret != FALSE, "Failed to get Processor Topology Information");
uint32_t count = bufSize / pBufferMem->Size;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX pBuffer = pBufferMem;
for (uint32_t i = 0; i < count; ++i)
{
SWR_ASSERT(pBuffer->Relationship == RelationProcessorCore);
for (uint32_t g = 0; g < pBuffer->Processor.GroupCount; ++g)
{
auto& gmask = pBuffer->Processor.GroupMask[g];
uint32_t threadId = 0;
uint32_t procGroup = gmask.Group;
Core* pCore = nullptr;
uint32_t numThreads = (uint32_t)_mm_popcount_sizeT(gmask.Mask);
while (BitScanForwardSizeT((unsigned long*)&threadId, gmask.Mask))
{
// clear mask
KAFFINITY threadMask = KAFFINITY(1) << threadId;
gmask.Mask &= ~threadMask;
if (procGroup >= threadMaskPerProcGroup.size())
{
threadMaskPerProcGroup.resize(procGroup + 1);
}
if (threadMaskPerProcGroup[procGroup] & threadMask)
{
// Already seen this mask. This means that we are in 32-bit mode and
// have seen more than 32 HW threads for this procGroup
// Don't use it
#if defined(_WIN64)
SWR_INVALID("Shouldn't get here in 64-bit mode");
#endif
continue;
}
threadMaskPerProcGroup[procGroup] |= (KAFFINITY(1) << threadId);
// Find Numa Node
uint32_t numaId = 0;
PROCESSOR_NUMBER procNum = {};
procNum.Group = WORD(procGroup);
procNum.Number = UCHAR(threadId);
ret = GetNumaProcessorNodeEx(&procNum, (PUSHORT)&numaId);
SWR_ASSERT(ret);
// Store data
if (out_nodes.size() <= numaId)
{
out_nodes.resize(numaId + 1);
}
auto& numaNode = out_nodes[numaId];
numaNode.numaId = numaId;
uint32_t coreId = 0;
if (nullptr == pCore)
{
numaNode.cores.push_back(Core());
pCore = &numaNode.cores.back();
pCore->procGroup = procGroup;
}
pCore->threadIds.push_back(threadId);
if (procGroup == 0)
{
out_numThreadsPerProcGroup++;
}
}
}
pBuffer = PtrAdd(pBuffer, pBuffer->Size);
}
free(pBufferMem);
#elif defined(__linux__) || defined (__gnu_linux__)
// Parse /proc/cpuinfo to get full topology
std::ifstream input("/proc/cpuinfo");
std::string line;
char* c;
uint32_t procId = uint32_t(-1);
uint32_t coreId = uint32_t(-1);
uint32_t physId = uint32_t(-1);
while (std::getline(input, line))
{
if (line.find("processor") != std::string::npos)
{
auto data_start = line.find(": ") + 2;
procId = std::strtoul(&line.c_str()[data_start], &c, 10);
continue;
}
if (line.find("core id") != std::string::npos)
{
auto data_start = line.find(": ") + 2;
coreId = std::strtoul(&line.c_str()[data_start], &c, 10);
continue;
}
if (line.find("physical id") != std::string::npos)
{
auto data_start = line.find(": ") + 2;
physId = std::strtoul(&line.c_str()[data_start], &c, 10);
continue;
}
if (line.length() == 0)
{
if (physId + 1 > out_nodes.size())
out_nodes.resize(physId + 1);
auto& numaNode = out_nodes[physId];
numaNode.numaId = physId;
if (coreId + 1 > numaNode.cores.size())
numaNode.cores.resize(coreId + 1);
auto& core = numaNode.cores[coreId];
core.procGroup = coreId;
core.threadIds.push_back(procId);
}
}
out_numThreadsPerProcGroup = 0;
for (auto &node : out_nodes)
{
for (auto &core : node.cores)
{
out_numThreadsPerProcGroup += core.threadIds.size();
}
}
#elif defined(__APPLE__)
auto numProcessors = 0;
auto numCores = 0;
auto numPhysicalIds = 0;
int value;
size_t size = sizeof(value);
int result = sysctlbyname("hw.packages", &value, &size, NULL, 0);
SWR_ASSERT(result == 0);
numPhysicalIds = value;
result = sysctlbyname("hw.logicalcpu", &value, &size, NULL, 0);
SWR_ASSERT(result == 0);
numProcessors = value;
result = sysctlbyname("hw.physicalcpu", &value, &size, NULL, 0);
SWR_ASSERT(result == 0);
numCores = value;
out_nodes.resize(numPhysicalIds);
for (auto physId = 0; physId < numPhysicalIds; ++physId)
{
auto &numaNode = out_nodes[physId];
auto procId = 0;
numaNode.cores.resize(numCores);
while (procId < numProcessors)
{
for (auto coreId = 0; coreId < numaNode.cores.size(); ++coreId, ++procId)
{
auto &core = numaNode.cores[coreId];
core.procGroup = coreId;
core.threadIds.push_back(procId);
}
}
}
out_numThreadsPerProcGroup = 0;
for (auto &node : out_nodes)
{
for (auto &core : node.cores)
{
out_numThreadsPerProcGroup += core.threadIds.size();
}
}
#else
#error Unsupported platform
#endif
// Prune empty cores and numa nodes
for (auto node_it = out_nodes.begin(); node_it != out_nodes.end(); )
{
// Erase empty cores (first)
for (auto core_it = node_it->cores.begin(); core_it != node_it->cores.end(); )
{
if (core_it->threadIds.size() == 0)
{
core_it = node_it->cores.erase(core_it);
}
else
{
++core_it;
}
}
// Erase empty numa nodes (second)
if (node_it->cores.size() == 0)
{
node_it = out_nodes.erase(node_it);
}
else
{
++node_it;
}
}
}
void CalculateProcessorTopology(CPUNumaNodes& out_nodes, uint32_t& out_numThreadsPerProcGroup)
{
out_nodes.clear();
out_numThreadsPerProcGroup = 0;
#if defined(_WIN32)
static std::mutex m;
std::lock_guard<std::mutex> l(m);
static SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX buffer[KNOB_MAX_NUM_THREADS];
DWORD bufSize = sizeof(buffer);
BOOL ret = GetLogicalProcessorInformationEx(RelationProcessorCore, buffer, &bufSize);
SWR_ASSERT(ret != FALSE, "Failed to get Processor Topology Information");
uint32_t count = bufSize / buffer->Size;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX pBuffer = buffer;
for (uint32_t i = 0; i < count; ++i)
{
SWR_ASSERT(pBuffer->Relationship == RelationProcessorCore);
for (uint32_t g = 0; g < pBuffer->Processor.GroupCount; ++g)
{
auto& gmask = pBuffer->Processor.GroupMask[g];
uint32_t threadId = 0;
uint32_t procGroup = gmask.Group;
Core* pCore = nullptr;
uint32_t numThreads = (uint32_t)_mm_popcount_sizeT(gmask.Mask);
while (BitScanForwardSizeT((unsigned long*)&threadId, gmask.Mask))
{
// clear mask
gmask.Mask &= ~(KAFFINITY(1) << threadId);
// Find Numa Node
PROCESSOR_NUMBER procNum = {};
procNum.Group = WORD(procGroup);
procNum.Number = UCHAR(threadId);
uint32_t numaId = 0;
ret = GetNumaProcessorNodeEx(&procNum, (PUSHORT)&numaId);
SWR_ASSERT(ret);
// Store data
if (out_nodes.size() <= numaId) out_nodes.resize(numaId + 1);
auto& numaNode = out_nodes[numaId];
uint32_t coreId = 0;
if (nullptr == pCore)
{
numaNode.cores.push_back(Core());
pCore = &numaNode.cores.back();
pCore->procGroup = procGroup;
#if !defined(_WIN64)
coreId = (uint32_t)numaNode.cores.size();
if ((coreId * numThreads) >= 32)
{
// Windows doesn't return threadIds >= 32 for a processor group correctly
// when running a 32-bit application.
// Just save -1 as the threadId
threadId = uint32_t(-1);
}
#endif
}
pCore->threadIds.push_back(threadId);
if (procGroup == 0)
{
out_numThreadsPerProcGroup++;
}
}
}
pBuffer = PtrAdd(pBuffer, pBuffer->Size);
}
#elif defined(__linux__) || defined (__gnu_linux__)
// Parse /proc/cpuinfo to get full topology
std::ifstream input("/proc/cpuinfo");
std::string line;
char* c;
uint32_t threadId = uint32_t(-1);
uint32_t coreId = uint32_t(-1);
uint32_t numaId = uint32_t(-1);
while (std::getline(input, line))
{
if (line.find("processor") != std::string::npos)
{
if (threadId != uint32_t(-1))
{
// Save information.
if (out_nodes.size() <= numaId) out_nodes.resize(numaId + 1);
auto& numaNode = out_nodes[numaId];
if (numaNode.cores.size() <= coreId) numaNode.cores.resize(coreId + 1);
auto& core = numaNode.cores[coreId];
core.procGroup = coreId;
core.threadIds.push_back(threadId);
out_numThreadsPerProcGroup++;
}
auto data_start = line.find(": ") + 2;
threadId = std::strtoul(&line.c_str()[data_start], &c, 10);
continue;
}
if (line.find("core id") != std::string::npos)
{
auto data_start = line.find(": ") + 2;
coreId = std::strtoul(&line.c_str()[data_start], &c, 10);
continue;
}
if (line.find("physical id") != std::string::npos)
{
auto data_start = line.find(": ") + 2;
numaId = std::strtoul(&line.c_str()[data_start], &c, 10);
continue;
}
}
if (threadId != uint32_t(-1))
{
// Save information.
if (out_nodes.size() <= numaId) out_nodes.resize(numaId + 1);
auto& numaNode = out_nodes[numaId];
if (numaNode.cores.size() <= coreId) numaNode.cores.resize(coreId + 1);
auto& core = numaNode.cores[coreId];
core.procGroup = coreId;
core.threadIds.push_back(threadId);
out_numThreadsPerProcGroup++;
}
for (uint32_t node = 0; node < out_nodes.size(); node++) {
auto& numaNode = out_nodes[node];
auto it = numaNode.cores.begin();
for ( ; it != numaNode.cores.end(); ) {
if (it->threadIds.size() == 0)
numaNode.cores.erase(it);
else
++it;
}
}
#else
#error Unsupported platform
#endif
}