Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 1 | /* |
Pablo Tello | 456e479 | 2018-01-31 17:27:09 +0000 | [diff] [blame] | 2 | * Copyright (c) 2016-2018 ARM Limited. |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: MIT |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to |
| 8 | * deal in the Software without restriction, including without limitation the |
| 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 10 | * sell copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all |
| 14 | * copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
| 24 | #include "arm_compute/runtime/IScheduler.h" |
| 25 | |
| 26 | #include <array> |
| 27 | #include <cstdlib> |
| 28 | #include <cstring> |
| 29 | #include <fcntl.h> |
Georgios Pinitas | 53d1227 | 2018-02-01 20:23:25 +0000 | [diff] [blame] | 30 | #include <fstream> |
| 31 | #include <map> |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 32 | #include <sched.h> |
| 33 | #include <sys/stat.h> |
| 34 | #include <sys/types.h> |
| 35 | #include <unistd.h> |
| 36 | |
Georgios Pinitas | 53d1227 | 2018-02-01 20:23:25 +0000 | [diff] [blame] | 37 | #ifndef BARE_METAL |
| 38 | #include <regex> |
| 39 | #include <thread> |
| 40 | #endif /* BARE_METAL */ |
| 41 | |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 42 | namespace |
| 43 | { |
Georgios Pinitas | 53d1227 | 2018-02-01 20:23:25 +0000 | [diff] [blame] | 44 | unsigned int get_threads_hint() |
| 45 | { |
| 46 | unsigned int num_threads_hint = 1; |
| 47 | |
| 48 | #ifndef BARE_METAL |
| 49 | std::map<std::string, unsigned int> cpu_part_occurrence_map; |
| 50 | |
| 51 | // CPU part regex |
| 52 | std::regex cpu_part_rgx(R"(.*CPU part.+?(?=:).+?(?=\w+)(\w+).*)"); |
| 53 | std::smatch cpu_part_match; |
| 54 | |
| 55 | // Read cpuinfo and get occurrence of each core |
| 56 | std::ifstream cpuinfo; |
| 57 | cpuinfo.open("/proc/cpuinfo", std::ios::in); |
| 58 | if(cpuinfo.is_open()) |
| 59 | { |
| 60 | std::string line; |
| 61 | while(bool(getline(cpuinfo, line))) |
| 62 | { |
| 63 | if(std::regex_search(line.cbegin(), line.cend(), cpu_part_match, cpu_part_rgx)) |
| 64 | { |
| 65 | std::string cpu_part = cpu_part_match[1]; |
| 66 | if(cpu_part_occurrence_map.find(cpu_part) != cpu_part_occurrence_map.end()) |
| 67 | { |
| 68 | cpu_part_occurrence_map[cpu_part]++; |
| 69 | } |
| 70 | else |
| 71 | { |
| 72 | cpu_part_occurrence_map[cpu_part] = 1; |
| 73 | } |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | // Get min number of threads |
| 79 | auto min_common_cores = std::min_element(cpu_part_occurrence_map.begin(), cpu_part_occurrence_map.end(), |
| 80 | [](const std::pair<std::string, unsigned int> &p1, const std::pair<std::string, unsigned int> &p2) |
| 81 | { |
| 82 | return p1.second < p2.second; |
| 83 | }); |
| 84 | |
| 85 | // Set thread hint |
| 86 | num_threads_hint = cpu_part_occurrence_map.empty() ? std::thread::hardware_concurrency() : min_common_cores->second; |
| 87 | #endif /* BARE_METAL */ |
| 88 | |
| 89 | return num_threads_hint; |
| 90 | } |
| 91 | |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 92 | unsigned int get_cpu_impl() |
| 93 | { |
| 94 | #ifndef BARE_METAL |
| 95 | int fd = open("/proc/cpuinfo", 0); // NOLINT |
Pablo Tello | 456e479 | 2018-01-31 17:27:09 +0000 | [diff] [blame] | 96 | std::array<char, 3000> buff{ {} }; |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 97 | char *pos = nullptr; |
| 98 | char *end = nullptr; |
| 99 | bool foundid = false; |
| 100 | |
| 101 | int cpu = sched_getcpu(); |
| 102 | |
| 103 | if(fd == -1) |
| 104 | { |
| 105 | return 0; |
| 106 | } |
| 107 | |
Pablo Tello | 456e479 | 2018-01-31 17:27:09 +0000 | [diff] [blame] | 108 | int charsread = read(fd, buff.data(), 3000); |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 109 | pos = buff.data(); |
| 110 | end = buff.data() + charsread; |
| 111 | |
| 112 | close(fd); |
| 113 | |
| 114 | /* So, to date I've encountered two formats for /proc/cpuinfo. |
| 115 | * |
| 116 | * One of them just lists processor : n for each processor (with no |
| 117 | * other info), then at the end lists part information for the current |
| 118 | * CPU. |
| 119 | * |
| 120 | * The other has an entire clause (including part number info) for each |
| 121 | * CPU in the system, with "processor : n" headers. |
| 122 | * |
| 123 | * We can cope with either of these formats by waiting to see |
| 124 | * "processor: n" (where n = our CPU ID), and then looking for the next |
| 125 | * "CPU part" field. |
| 126 | */ |
| 127 | while(pos < end) |
| 128 | { |
| 129 | if(foundid && strncmp(pos, "CPU part", 8) == 0) |
| 130 | { |
| 131 | /* Found part number */ |
| 132 | pos += 11; |
| 133 | |
| 134 | for(char *ch = pos; ch < end; ch++) |
| 135 | { |
| 136 | if(*ch == '\n') |
| 137 | { |
| 138 | *ch = '\0'; |
| 139 | break; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | return strtoul(pos, nullptr, 0); |
| 144 | } |
| 145 | |
| 146 | if(strncmp(pos, "processor", 9) == 0) |
| 147 | { |
| 148 | /* Found processor ID, see if it's ours. */ |
| 149 | pos += 11; |
| 150 | |
| 151 | for(char *ch = pos; ch < end; ch++) |
| 152 | { |
| 153 | if(*ch == '\n') |
| 154 | { |
| 155 | *ch = '\0'; |
| 156 | break; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | int num = strtol(pos, nullptr, 0); |
| 161 | |
| 162 | if(num == cpu) |
| 163 | { |
| 164 | foundid = true; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | while(pos < end) |
| 169 | { |
| 170 | char ch = *pos++; |
| 171 | if(ch == '\n' || ch == '\0') |
| 172 | { |
| 173 | break; |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | #endif /* BARE_METAL */ |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | } // namespace |
| 182 | |
| 183 | namespace arm_compute |
| 184 | { |
| 185 | IScheduler::IScheduler() |
| 186 | { |
Georgios Pinitas | 53d1227 | 2018-02-01 20:23:25 +0000 | [diff] [blame] | 187 | // Work out the best possible number of execution threads |
| 188 | _num_threads_hint = get_threads_hint(); |
| 189 | |
| 190 | // Work out the CPU implementation |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 191 | switch(get_cpu_impl()) |
| 192 | { |
Pablo Tello | 6f6639d | 2017-12-04 17:30:07 +0000 | [diff] [blame] | 193 | case 0xd0f: |
| 194 | _info.CPU = CPUTarget::A55_DOT; |
| 195 | break; |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 196 | case 0xd03: |
| 197 | _info.CPU = CPUTarget::A53; |
| 198 | break; |
| 199 | default: |
Moritz Pflanzer | 80373f6 | 2017-09-15 10:42:58 +0100 | [diff] [blame] | 200 | #ifdef __arm__ |
| 201 | _info.CPU = CPUTarget::ARMV7; |
| 202 | #elif __aarch64__ |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 203 | _info.CPU = CPUTarget::ARMV8; |
Moritz Pflanzer | 80373f6 | 2017-09-15 10:42:58 +0100 | [diff] [blame] | 204 | #else /* __arm__ || __aarch64__ */ |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 205 | _info.CPU = CPUTarget::INTRINSICS; |
Moritz Pflanzer | 80373f6 | 2017-09-15 10:42:58 +0100 | [diff] [blame] | 206 | #endif /* __arm__ || __aarch64__ */ |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 207 | break; |
| 208 | } |
| 209 | |
| 210 | _info.L1_size = 31000; |
| 211 | _info.L2_size = 500000; |
| 212 | } |
| 213 | |
| 214 | void IScheduler::set_target(CPUTarget target) |
| 215 | { |
| 216 | _info.CPU = target; |
| 217 | } |
| 218 | |
| 219 | CPUInfo IScheduler::cpu_info() const |
| 220 | { |
| 221 | return _info; |
| 222 | } |
Georgios Pinitas | 53d1227 | 2018-02-01 20:23:25 +0000 | [diff] [blame] | 223 | |
| 224 | unsigned int IScheduler::num_threads_hint() const |
| 225 | { |
| 226 | return _num_threads_hint; |
| 227 | } |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 228 | } // namespace arm_compute |