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Fix sloppy L3 cache detection code

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Fixes https://github.com/official-stockfish/Stockfish/issues/6857

Many thanks to Andrew for the repro

closes https://github.com/official-stockfish/Stockfish/pull/6858

No functional change
This commit is contained in:
anematode
2026-05-27 07:05:56 +02:00
committed by Joost VandeVondele
parent 77a8f6ccf3
commit 564f9f9c85
1 changed files with 6 additions and 11 deletions
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src/numa.h
+5 -10
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@@ -1166,23 +1166,18 @@ class NumaConfig {
#if defined(__linux__) && !defined(__ANDROID__) #if defined(__linux__) && !defined(__ANDROID__)
std::set<CpuIndex> seenCpus; std::set<CpuIndex> seenCpus;
auto nextUnseenCpu = [&seenCpus]() {
for (CpuIndex i = 0;; ++i)
if (!seenCpus.count(i))
return i;
};
while (true) for (const auto& [next, _] : systemConfig.nodeByCpu)
{ {
CpuIndex next = nextUnseenCpu(); if (seenCpus.count(next))
continue;
auto siblingsStr = auto siblingsStr =
read_file_to_string("/sys/devices/system/cpu/cpu" + std::to_string(next) read_file_to_string("/sys/devices/system/cpu/cpu" + std::to_string(next)
+ "/cache/index3/shared_cpu_list"); + "/cache/index3/shared_cpu_list");
if (!siblingsStr.has_value() || siblingsStr->empty()) if (!siblingsStr.has_value() || siblingsStr->empty())
{ continue;
break; // we have read all available CPUs
}
L3Domain domain; L3Domain domain;
for (size_t c : indices_from_shortened_string(*siblingsStr)) for (size_t c : indices_from_shortened_string(*siblingsStr))