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fix get_num_physical_cores() (#1436)

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* fix get_num_physical_cores()
had been broken on complex topologies because "cpu cores" in /proc/cpuinfo is per-"physical id"

* Add spaces to maintain consistent formatting

---------

Co-authored-by: slaren <ddevesa@gmail.com>
This commit is contained in:
zrm 2023-05-14 22:25:42 -04:00 committed by GitHub
parent b5c9295eef
commit 63d20469b8
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1 changed files with 15 additions and 14 deletions
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25
examples/common.cpp
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@ -8,6 +8,7 @@
#include <iterator>
#include <algorithm>
#include <sstream>
#include <unordered_set>
#if defined(__APPLE__) && defined(__MACH__)
#include <sys/types.h>
@ -28,21 +29,21 @@
int32_t get_num_physical_cores() {
#ifdef __linux__
std::ifstream cpuinfo("/proc/cpuinfo");
// enumerate the set of thread siblings, num entries is num cores
std::unordered_set<std::string> siblings;
for (uint32_t cpu=0; cpu < UINT32_MAX; ++cpu) {
std::ifstream thread_siblings("/sys/devices/system/cpu"
+ std::to_string(cpu) + "/topology/thread_siblings");
if (!thread_siblings.is_open()) {
break; // no more cpus
}
std::string line;
while (std::getline(cpuinfo, line)) {
std::size_t pos = line.find("cpu cores");
if (pos != std::string::npos) {
pos = line.find(": ", pos);
if (pos != std::string::npos) {
try {
// Extract the number and return it
return static_cast<int32_t>(std::stoul(line.substr(pos + 2)));
} catch (const std::invalid_argument &) {
// Ignore if we could not parse
}
if (std::getline(thread_siblings, line)) {
siblings.insert(line);
}
}
if (siblings.size() > 0) {
return static_cast<int32_t>(siblings.size());
}
#elif defined(__APPLE__) && defined(__MACH__)
int32_t num_physical_cores;