1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283
| #include <iostream> #include <thread> #include <chrono> #include <string.h>
#ifdef WIN32 #include <windows.h> #include <psapi.h>
#include <direct.h> #include <process.h> #else #include <sys/stat.h> #include <sys/sysinfo.h> #include <sys/time.h> #include <unistd.h> #endif
inline int GetCurrentPid() { return getpid(); }
#ifdef WIN32
static uint64_t convert_time_format(const FILETIME* ftime) { LARGE_INTEGER li;
li.LowPart = ftime->dwLowDateTime; li.HighPart = ftime->dwHighDateTime; return li.QuadPart; } #else
#define VMRSS_LINE 22 #define PROCESS_ITEM 14
static const char* get_items(const char* buffer, unsigned int item) { const char* p = buffer;
int len = strlen(buffer); int count = 0;
for (int i = 0; i < len; i++) { if (' ' == *p) { count++; if (count == item - 1) { p++; break; } } p++; }
return p; }
static inline unsigned long get_cpu_total_occupy() {
unsigned long user_time; unsigned long nice_time; unsigned long system_time; unsigned long idle_time;
FILE* fd; char buff[1024] = { 0 };
fd = fopen("/proc/stat", "r"); if (nullptr == fd) return 0;
fgets(buff, sizeof(buff), fd); char name[64] = { 0 }; sscanf(buff, "%s %ld %ld %ld %ld", name, &user_time, &nice_time, &system_time, &idle_time); fclose(fd);
return (user_time + nice_time + system_time + idle_time); }
static inline unsigned long get_cpu_proc_occupy(int pid) { unsigned int tmp_pid; unsigned long utime; unsigned long stime; unsigned long cutime; unsigned long cstime;
char file_name[64] = { 0 }; FILE* fd; char line_buff[1024] = { 0 }; sprintf(file_name, "/proc/%d/stat", pid);
fd = fopen(file_name, "r"); if (nullptr == fd) return 0;
fgets(line_buff, sizeof(line_buff), fd);
sscanf(line_buff, "%u", &tmp_pid); const char* q = get_items(line_buff, PROCESS_ITEM); sscanf(q, "%ld %ld %ld %ld", &utime, &stime, &cutime, &cstime); fclose(fd);
return (utime + stime + cutime + cstime); } #endif
inline float GetCpuUsageRatio(int pid) { #ifdef WIN32 static int64_t last_time = 0; static int64_t last_system_time = 0;
FILETIME now; FILETIME creation_time; FILETIME exit_time; FILETIME kernel_time; FILETIME user_time; int64_t system_time; int64_t time; int64_t system_time_delta; int64_t time_delta;
SYSTEM_INFO info; GetSystemInfo(&info); int cpu_num = info.dwNumberOfProcessors;
float cpu_ratio = 0.0;
HANDLE process = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);
GetSystemTimeAsFileTime(&now);
if (!GetProcessTimes(process, &creation_time, &exit_time, &kernel_time, &user_time)) { printf("GetCpuUsageRatio GetProcessTimes failed\n"); return 0.0; }
system_time = (convert_time_format(&kernel_time) + convert_time_format(&user_time)) / cpu_num; time = convert_time_format(&now);
if ((last_system_time == 0) || (last_time == 0)) { last_system_time = system_time; last_time = time; return 0.0; }
system_time_delta = system_time - last_system_time; time_delta = time - last_time;
CloseHandle(process);
if (time_delta == 0) { printf("GetCpuUsageRatio time_delta is 0, error\n"); return 0.0; }
cpu_ratio = (int)((system_time_delta * 100 + time_delta / 2) / time_delta); last_system_time = system_time; last_time = time;
cpu_ratio /= 100.0;
return cpu_ratio; #else unsigned long totalcputime1, totalcputime2; unsigned long procputime1, procputime2;
totalcputime1 = get_cpu_total_occupy(); procputime1 = get_cpu_proc_occupy(pid);
usleep(200000);
totalcputime2 = get_cpu_total_occupy(); procputime2 = get_cpu_proc_occupy(pid);
float pcpu = 0.0; if (0 != totalcputime2 - totalcputime1) pcpu = (procputime2 - procputime1) / float(totalcputime2 - totalcputime1);
int cpu_num = get_nprocs(); pcpu *= cpu_num;
return pcpu; #endif }
inline float GetMemoryUsage(int pid) { #ifdef WIN32 uint64_t mem = 0, vmem = 0; PROCESS_MEMORY_COUNTERS pmc;
HANDLE process = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid); if (GetProcessMemoryInfo(process, &pmc, sizeof(pmc))) { mem = pmc.WorkingSetSize; vmem = pmc.PagefileUsage; } CloseHandle(process);
return mem / 1024.0 / 1024.0;
#else char file_name[64] = { 0 }; FILE* fd; char line_buff[512] = { 0 }; sprintf(file_name, "/proc/%d/status", pid);
fd = fopen(file_name, "r"); if (nullptr == fd) return 0;
char name[64]; int vmrss = 0; for (int i = 0; i < VMRSS_LINE - 1; i++) fgets(line_buff, sizeof(line_buff), fd);
fgets(line_buff, sizeof(line_buff), fd); sscanf(line_buff, "%s %d", name, &vmrss); fclose(fd);
return vmrss / 1024.0; #endif }
int main() { for (int i = 0; i < 5; i++) std::thread([] { std::this_thread::sleep_for(std::chrono::milliseconds(10)); }).detach();
int current_pid = GetCurrentPid(); float cpu_usage_ratio = GetCpuUsageRatio(current_pid); float memory_usage = GetMemoryUsage(current_pid);
while (true) { std::cout << "current pid: " << current_pid << std::endl; std::cout << "cpu usage ratio: " << cpu_usage_ratio * 100 << "%" << std::endl; std::cout << "memory usage: " << memory_usage << "MB" << std::endl;
std::this_thread::sleep_for(std::chrono::milliseconds(1000)); }
return 0; }
|