94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/* XMRig
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* Copyright 2010 Jeff Garzik <jgarzik@pobox.com>
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* Copyright 2012-2014 pooler <pooler@litecoinpool.org>
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* Copyright 2014 Lucas Jones <https://github.com/lucasjones>
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* Copyright 2014-2016 Wolf9466 <https://github.com/OhGodAPet>
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* Copyright 2016 Jay D Dee <jayddee246@gmail.com>
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* Copyright 2016-2017 XMRig <support@xmrig.com>
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*
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <cpuid.h>
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#include <string.h>
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#include <stdbool.h>
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#include <math.h>
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#ifndef BUILD_TEST
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# include <libcpuid.h>
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#endif
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#include "cpu.h"
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#include "utils/applog.h"
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#ifndef BUILD_TEST
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void cpu_init_common() {
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struct cpu_raw_data_t raw = { 0 };
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struct cpu_id_t data = { 0 };
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cpuid_get_raw_data(&raw);
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cpu_identify(&raw, &data);
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strncpy(cpu_info.brand, data.brand_str, sizeof(cpu_info.brand) - 1);
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cpu_info.total_logical_cpus = data.total_logical_cpus;
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cpu_info.sockets = data.total_logical_cpus / data.num_logical_cpus;
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cpu_info.total_cores = data.num_cores * cpu_info.sockets;
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cpu_info.l2_cache = data.l2_cache > 0 ? data.l2_cache * cpu_info.total_cores * cpu_info.sockets : 0;
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cpu_info.l3_cache = data.l3_cache > 0 ? data.l3_cache * cpu_info.sockets : 0;
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# ifdef __x86_64__
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cpu_info.flags |= CPU_FLAG_X86_64;
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# endif
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if (data.flags[CPU_FEATURE_AES]) {
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cpu_info.flags |= CPU_FLAG_AES;
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}
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if (data.flags[CPU_FEATURE_BMI2]) {
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cpu_info.flags |= CPU_FLAG_BMI2;
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}
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}
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#endif
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int get_optimal_threads_count(int algo, bool double_hash, int max_cpu_usage) {
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if (cpu_info.total_logical_cpus == 1) {
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return 1;
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}
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int cache = cpu_info.l3_cache ? cpu_info.l3_cache : cpu_info.l2_cache;
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int count = 0;
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const int size = (algo ? 1024 : 2048) * (double_hash ? 2 : 1);
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if (cache) {
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count = cache / size;
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}
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else {
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count = cpu_info.total_logical_cpus / 2;
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}
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if (count > cpu_info.total_logical_cpus) {
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count = cpu_info.total_logical_cpus;
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}
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if (((float) count / cpu_info.total_logical_cpus * 100) > max_cpu_usage) {
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count = ceil((float) cpu_info.total_logical_cpus * (max_cpu_usage / 100.0));
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}
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return count < 1 ? 1 : count;
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}
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