09a263e607
git-subtree-dir: deps/memkind/src git-subtree-split: bb9f19dd1b3ed6cc5e1b35919564ccf6f4b32f69
95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
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/*
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* Copyright (C) 2016 - 2018 Intel Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice(s),
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice(s),
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <fstream>
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#include <string.h>
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#include <numa.h>
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#include <vector>
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#include <iostream>
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#include <stdexcept>
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/*
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* HugePageOrganizer sets hugepages per NUMA node and restore initial setup of hugepages.
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* It writes and reads from the same file, so using HugePageOrganizer with parallel execution may cause undefined behaviour.
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*/
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class HugePageOrganizer
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{
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public:
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HugePageOrganizer(int nr_hugepages_per_node)
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{
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for (int node_id = 0; node_id < numa_num_configured_nodes(); node_id++) {
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initial_nr_hugepages_per_nodes.push_back(get_nr_hugepages(node_id));
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if (set_nr_hugepages(nr_hugepages_per_node, node_id)) {
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restore();
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throw std::runtime_error("Error: Could not set the requested amount of huge pages.");
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}
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}
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}
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~HugePageOrganizer()
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{
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restore();
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}
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private:
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std::vector<int> initial_nr_hugepages_per_nodes;
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int get_nr_hugepages(int node_number)
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{
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std::string line;
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char path[128];
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sprintf(path,
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"/sys/devices/system/node/node%d/hugepages/hugepages-2048kB/nr_hugepages",
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node_number);
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std::ifstream file(path);
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if (!file) {
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return -1;
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}
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std::getline(file, line);
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return strtol(line.c_str(), 0, 10);
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}
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int set_nr_hugepages(int nr_hugepages, int node_number)
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{
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char cmd[128];
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sprintf(cmd, "sudo sh -c \"echo %d > \
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/sys/devices/system/node/node%d/hugepages/hugepages-2048kB/nr_hugepages\"",
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nr_hugepages, node_number);
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if (system(cmd) || (get_nr_hugepages(node_number) != nr_hugepages)) {
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return -1;
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}
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return 0;
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}
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void restore()
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{
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for(size_t node_id = 0; node_id < initial_nr_hugepages_per_nodes.size();
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node_id++) {
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set_nr_hugepages(initial_nr_hugepages_per_nodes[node_id], node_id);
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}
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}
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};
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