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| 1 | +/* |
| 2 | + * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
| 3 | + * |
| 4 | + * Use of this source code is governed by a BSD-style license |
| 5 | + * that can be found in the LICENSE file in the root of the source |
| 6 | + * tree. An additional intellectual property rights grant can be found |
| 7 | + * in the file PATENTS. All contributing project authors may |
| 8 | + * be found in the AUTHORS file in the root of the source tree. |
| 9 | + */ |
| 10 | + |
| 11 | +#include "cpu_linux.h" |
| 12 | + |
| 13 | +#include <stdio.h> |
| 14 | +#include <stdlib.h> |
| 15 | +#include <string.h> |
| 16 | +#include <unistd.h> |
| 17 | + |
| 18 | +namespace webrtc { |
| 19 | +CpuLinux::CpuLinux() |
| 20 | + : m_oldBusyTime(0), |
| 21 | + m_oldIdleTime(0), |
| 22 | + m_oldBusyTimeMulti(NULL), |
| 23 | + m_oldIdleTimeMulti(NULL), |
| 24 | + m_idleArray(NULL), |
| 25 | + m_busyArray(NULL), |
| 26 | + m_resultArray(NULL), |
| 27 | + m_numCores(0) { |
| 28 | + const int result = GetNumCores(); |
| 29 | + if (result != -1) { |
| 30 | + m_numCores = result; |
| 31 | + m_oldBusyTimeMulti = new long long[m_numCores]; |
| 32 | + memset(m_oldBusyTimeMulti, 0, sizeof(long long) * m_numCores); |
| 33 | + m_oldIdleTimeMulti = new long long[m_numCores]; |
| 34 | + memset(m_oldIdleTimeMulti, 0, sizeof(long long) * m_numCores); |
| 35 | + m_idleArray = new long long[m_numCores]; |
| 36 | + memset(m_idleArray, 0, sizeof(long long) * m_numCores); |
| 37 | + m_busyArray = new long long[m_numCores]; |
| 38 | + memset(m_busyArray, 0, sizeof(long long) * m_numCores); |
| 39 | + m_resultArray = new uint32_t[m_numCores]; |
| 40 | + |
| 41 | + GetData(m_oldBusyTime, m_oldIdleTime, m_busyArray, m_idleArray); |
| 42 | + } |
| 43 | +} |
| 44 | + |
| 45 | +CpuLinux::~CpuLinux() |
| 46 | +{ |
| 47 | + delete [] m_oldBusyTimeMulti; |
| 48 | + delete [] m_oldIdleTimeMulti; |
| 49 | + delete [] m_idleArray; |
| 50 | + delete [] m_busyArray; |
| 51 | + delete [] m_resultArray; |
| 52 | +} |
| 53 | + |
| 54 | +int32_t CpuLinux::CpuUsage() |
| 55 | +{ |
| 56 | + uint32_t dummy = 0; |
| 57 | + uint32_t* dummyArray = NULL; |
| 58 | + return CpuUsageMultiCore(dummy, dummyArray); |
| 59 | +} |
| 60 | + |
| 61 | +int32_t CpuLinux::CpuUsageMultiCore(uint32_t& numCores, |
| 62 | + uint32_t*& coreArray) |
| 63 | +{ |
| 64 | + coreArray = m_resultArray; |
| 65 | + numCores = m_numCores; |
| 66 | + long long busy = 0; |
| 67 | + long long idle = 0; |
| 68 | + if (GetData(busy, idle, m_busyArray, m_idleArray) != 0) |
| 69 | + return -1; |
| 70 | + |
| 71 | + long long deltaBusy = busy - m_oldBusyTime; |
| 72 | + long long deltaIdle = idle - m_oldIdleTime; |
| 73 | + m_oldBusyTime = busy; |
| 74 | + m_oldIdleTime = idle; |
| 75 | + |
| 76 | + int retVal = -1; |
| 77 | + if (deltaBusy + deltaIdle == 0) |
| 78 | + { |
| 79 | + retVal = 0; |
| 80 | + } |
| 81 | + else |
| 82 | + { |
| 83 | + retVal = (int)(100 * (deltaBusy) / (deltaBusy + deltaIdle)); |
| 84 | + } |
| 85 | + |
| 86 | + if (coreArray == NULL) |
| 87 | + { |
| 88 | + return retVal; |
| 89 | + } |
| 90 | + |
| 91 | + for (int32_t i = 0; i < m_numCores; i++) |
| 92 | + { |
| 93 | + deltaBusy = m_busyArray[i] - m_oldBusyTimeMulti[i]; |
| 94 | + deltaIdle = m_idleArray[i] - m_oldIdleTimeMulti[i]; |
| 95 | + m_oldBusyTimeMulti[i] = m_busyArray[i]; |
| 96 | + m_oldIdleTimeMulti[i] = m_idleArray[i]; |
| 97 | + if(deltaBusy + deltaIdle == 0) |
| 98 | + { |
| 99 | + coreArray[i] = 0; |
| 100 | + } |
| 101 | + else |
| 102 | + { |
| 103 | + coreArray[i] = (int)(100 * (deltaBusy) / (deltaBusy+deltaIdle)); |
| 104 | + } |
| 105 | + } |
| 106 | + return retVal; |
| 107 | +} |
| 108 | + |
| 109 | + |
| 110 | +int CpuLinux::GetData(long long& busy, long long& idle, long long*& busyArray, |
| 111 | + long long*& idleArray) |
| 112 | +{ |
| 113 | + FILE* fp = fopen("/proc/stat", "r"); |
| 114 | + if (!fp) |
| 115 | + { |
| 116 | + return -1; |
| 117 | + } |
| 118 | + |
| 119 | + char line[100]; |
| 120 | + if (fgets(line, 100, fp) == NULL) { |
| 121 | + fclose(fp); |
| 122 | + return -1; |
| 123 | + } |
| 124 | + char firstWord[100]; |
| 125 | + if (sscanf(line, "%s ", firstWord) != 1) { |
| 126 | + fclose(fp); |
| 127 | + return -1; |
| 128 | + } |
| 129 | + if (strncmp(firstWord, "cpu", 3) != 0) { |
| 130 | + fclose(fp); |
| 131 | + return -1; |
| 132 | + } |
| 133 | + char sUser[100]; |
| 134 | + char sNice[100]; |
| 135 | + char sSystem[100]; |
| 136 | + char sIdle[100]; |
| 137 | + if (sscanf(line, "%s %s %s %s %s ", |
| 138 | + firstWord, sUser, sNice, sSystem, sIdle) != 5) { |
| 139 | + fclose(fp); |
| 140 | + return -1; |
| 141 | + } |
| 142 | + long long luser = atoll(sUser); |
| 143 | + long long lnice = atoll(sNice); |
| 144 | + long long lsystem = atoll(sSystem); |
| 145 | + long long lidle = atoll (sIdle); |
| 146 | + |
| 147 | + busy = luser + lnice + lsystem; |
| 148 | + idle = lidle; |
| 149 | + for (int32_t i = 0; i < m_numCores; i++) |
| 150 | + { |
| 151 | + if (fgets(line, 100, fp) == NULL) { |
| 152 | + fclose(fp); |
| 153 | + return -1; |
| 154 | + } |
| 155 | + if (sscanf(line, "%s %s %s %s %s ", firstWord, sUser, sNice, sSystem, |
| 156 | + sIdle) != 5) { |
| 157 | + fclose(fp); |
| 158 | + return -1; |
| 159 | + } |
| 160 | + luser = atoll(sUser); |
| 161 | + lnice = atoll(sNice); |
| 162 | + lsystem = atoll(sSystem); |
| 163 | + lidle = atoll (sIdle); |
| 164 | + busyArray[i] = luser + lnice + lsystem; |
| 165 | + idleArray[i] = lidle; |
| 166 | + } |
| 167 | + fclose(fp); |
| 168 | + return 0; |
| 169 | +} |
| 170 | + |
| 171 | +int CpuLinux::GetNumCores() |
| 172 | +{ |
| 173 | + FILE* fp = fopen("/proc/stat", "r"); |
| 174 | + if (!fp) |
| 175 | + { |
| 176 | + return -1; |
| 177 | + } |
| 178 | + // Skip first line |
| 179 | + char line[100]; |
| 180 | + if (!fgets(line, 100, fp)) |
| 181 | + { |
| 182 | + fclose(fp); |
| 183 | + return -1; |
| 184 | + } |
| 185 | + int numCores = -1; |
| 186 | + char firstWord[100]; |
| 187 | + do |
| 188 | + { |
| 189 | + numCores++; |
| 190 | + if (fgets(line, 100, fp)) |
| 191 | + { |
| 192 | + if (sscanf(line, "%s ", firstWord) != 1) { |
| 193 | + firstWord[0] = '\0'; |
| 194 | + } |
| 195 | + } else { |
| 196 | + break; |
| 197 | + } |
| 198 | + } while (strncmp(firstWord, "cpu", 3) == 0); |
| 199 | + fclose(fp); |
| 200 | + return numCores; |
| 201 | +} |
| 202 | + |
| 203 | +CpuWrapper* CpuWrapper::CreateCpu() |
| 204 | +{ |
| 205 | + return new CpuLinux(); |
| 206 | +} |
| 207 | + |
| 208 | +} // namespace webrtc |
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