8000 ANN_BENCH: fix the reported core count by achirkin · Pull Request #896 · rapidsai/cuvs · GitHub
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ANN_BENCH: fix the reported core count #896

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May 15, 2025
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ANN_BENCH: fix the reported core count #896

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8 changes: 5 additions & 3 deletions cpp/bench/ann/src/common/util.hpp
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2023-2024, NVIDIA CORPORATION.
* Copyright (c) 2023-2025, NVIDIA CORPORATION.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
Expand Down Expand Up @@ -388,20 +388,22 @@ inline auto host_info()
uint64_t cpu_freq_max = 0;
int host_processors_used = 0;
int host_cores_used = 0;
std::set<int> host_cores_selected{};
std::set<std::pair<int, int>> host_cores_selected{}; // pairs of (socket_id, core_id)
for (int cpu_id = 0; cpu_id < host_processors_configured; cpu_id++) {
if (CPU_ISSET_S(cpu_id, affinity_mask_buf.size(), affinity_mask) == 0) { continue; }
host_processors_used++;
std::string cpu_fpath = "/sys/devices/system/cpu/cpu" + std::to_string(cpu_id);
if (!std::filesystem::exists(cpu_fpath)) { continue; }

int this_cpu_core = 0;
int this_cpu_package = 0;
uint64_t this_cpu_freq_min = 0;
uint64_t this_cpu_freq_max = 0;
std::ifstream(cpu_fpath + "/topology/core_id") >> this_cpu_core;
std::ifstream(cpu_fpath + "/topology/physical_package_id") >> this_cpu_package;
std::ifstream(cpu_fpath + "/cpufreq/scaling_min_freq") >> this_cpu_freq_min;
std::ifstream(cpu_fpath + "/cpufreq/scaling_max_freq") >> this_cpu_freq_max;
host_cores_selected.insert(this_cpu_core);
host_cores_selected.insert(std::make_pair(this_cpu_package, this_cpu_core));
cpu_freq_min = cpu_freq_min == 0
? (this_cpu_freq_min * 1000ull)
: std::min<uint64_t>(this_cpu_freq_min * 1000ull, cpu_freq_min);
Expand Down
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