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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 99 | pmbaty | 1 | /* |
| 2 | Texel - A UCI chess engine. |
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| 3 | Copyright (C) 2014 Peter Österlund, peterosterlund2@gmail.com |
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| 4 | |||
| 5 | This program is free software: you can redistribute it and/or modify |
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| 6 | it under the terms of the GNU General Public License as published by |
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| 7 | the Free Software Foundation, either version 3 of the License, or |
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| 8 | (at your option) any later version. |
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| 9 | |||
| 10 | This program is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | GNU General Public License for more details. |
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| 14 | |||
| 15 | You should have received a copy of the GNU General Public License |
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 17 | */ |
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| 18 | |||
| 19 | /* |
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| 20 | * numa.hpp |
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| 21 | * |
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| 22 | * Created on: Jul 24, 2014 |
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| 23 | * Author: petero |
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| 24 | */ |
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| 25 | |||
| 26 | #ifndef NUMA_HPP_ |
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| 27 | #define NUMA_HPP_ |
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| 28 | |||
| 29 | #include <vector> |
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| 30 | |||
| 31 | |||
| 32 | /** Bind search threads to suitable NUMA nodes. */ |
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| 33 | class Numa { |
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| 34 | public: |
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| 35 | /** Get singleton instance. */ |
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| 36 | static Numa& instance(); |
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| 37 | |||
| 38 | /** Disable NUMA awareness. Useful when running several single-threaded |
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| 39 | * test games simultaneously on NUMA hardware. */ |
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| 40 | void disable(); |
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| 41 | |||
| 42 | /** Preferred node for a given search thread. */ |
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| 43 | int nodeForThread(int threadNo) const; |
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| 44 | |||
| 45 | /** Bind current thread to NUMA node determined by nodeForThread(). */ |
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| 46 | void bindThread(int threadNo) const; |
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| 47 | |||
| 48 | /** Return true if threadNo runs on the same NUMA node as thread 0. */ |
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| 49 | bool isMainNode(int threadNo) const; |
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| 50 | |||
| 51 | private: |
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| 52 | Numa(); |
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| 53 | |||
| 54 | /** Thread number to node number. */ |
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| 55 | std::vector<int> threadToNode; |
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| 56 | |||
| 57 | struct NodeInfo { |
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| 58 | explicit NodeInfo(int n = 0, int c = 0, int t = 0); |
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| 59 | int node; |
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| 60 | int numCores; |
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| 61 | int numThreads; |
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| 62 | }; |
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| 63 | }; |
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| 64 | |||
| 65 | inline |
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| 66 | Numa::NodeInfo::NodeInfo(int n, int c, int t) |
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| 67 | : node(n), numCores(c), numThreads(t) { |
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| 68 | } |
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| 69 | |||
| 70 | #endif /* NUMA_HPP_ */ |