2008年06月05日 星期四 16:58
得到cpu占有率的API函數(shù)：
GetSystemTimes
得到內(nèi)存使用情況的API函數(shù)：
GlobalMemoryStatusEx Function
Retrieves information about the system's current usage of both physical and virtual memory.
GetPerformanceInfo Function
Retrieves the performance values contained in the PERFORMANCE_INFORMATION structure
獲取特定程序的內(nèi)存使用情況用：
GetProcessMemoryInfo Function
Retrieves information about the memory usage of the specified process.
我寫的一個(gè)cpu使用率例子：
#define _WIN32_WINNT 0x0501
#include <Windows.h>
#include <iostream>
using namespace std;
__int64 CompareFileTime ( FILETIME time1, FILETIME time2 )
{
__int64 a = time1.dwHighDateTime << 32 | time1.dwLowDateTime ;
__int64 b = time2.dwHighDateTime << 32 | time2.dwLowDateTime ;
return (b - a);
}
void main()
{
HANDLE hEvent;
BOOL res ;
FILETIME preidleTime;
FILETIME prekernelTime;
FILETIME preuserTime;
FILETIME idleTime;
FILETIME kernelTime;
FILETIME userTime;
res = GetSystemTimes( &idleTime, &kernelTime, &userTime );
preidleTime = idleTime;
prekernelTime = kernelTime;
preuserTime = userTime ;
hEvent = CreateEvent (NULL,FALSE,FALSE,NULL); // 初始值為 nonsignaled ，并且每次觸發(fā)后自動(dòng)設(shè)置為nonsignaled
while (1){
WaitForSingleObject( hEvent,1000 ); //等待500毫秒
res = GetSystemTimes( &idleTime, &kernelTime, &userTime );
int idle = CompareFileTime( preidleTime,idleTime);
int kernel = CompareFileTime( prekernelTime, kernelTime);
int user = CompareFileTime(preuserTime, userTime);
int cpu = (kernel +user - idle) *100/(kernel+user);
int cpuidle = ( idle) *100/(kernel+user);
cout << "CPU利用率:" << cpu << "%" << " CPU空閑率:" <<cpuidle << "%" <<endl;
preidleTime = idleTime;
prekernelTime = kernelTime;
preuserTime = userTime ;
}
}
運(yùn)行效果如圖：
MSDN中 獲取內(nèi)存使用情況的例子：
Example Code [C++]
The following code shows a simple use of the GlobalMemoryStatusEx function.
// Sample output:
// There is 51 percent of memory in use.
// There are 2029968 total Kbytes of physical memory.
// There are 987388 free Kbytes of physical memory.
// There are 3884620 total Kbytes of paging file.
// There are 2799776 free Kbytes of paging file.
// There are 2097024 total Kbytes of virtual memory.
// There are 2084876 free Kbytes of virtual memory.
// There are 0 free Kbytes of extended memory.
#include <windows.h>
#include <stdio.h>
// Use to convert bytes to KB
#define DIV 1024
// Specify the width of the field in which to print the numbers.
// The asterisk in the format specifier "%*I64d" takes an integer
// argument and uses it to pad and right justify the number.
#define WIDTH 7
void main(int argc, char *argv[])
{
MEMORYSTATUSEX statex;
statex.dwLength = sizeof (statex);
GlobalMemoryStatusEx (&statex);
printf ("There is %*ld percent of memory in use.\n",
WIDTH, statex.dwMemoryLoad);
printf ("There are %*I64d total Kbytes of physical memory.\n",
WIDTH, statex.ullTotalPhys/DIV);
printf ("There are %*I64d free Kbytes of physical memory.\n",
WIDTH, statex.ullAvailPhys/DIV);
printf ("There are %*I64d total Kbytes of paging file.\n",
WIDTH, statex.ullTotalPageFile/DIV);
printf ("There are %*I64d free Kbytes of paging file.\n",
WIDTH, statex.ullAvailPageFile/DIV);
printf ("There are %*I64d total Kbytes of virtual memory.\n",
WIDTH, statex.ullTotalVirtual/DIV);
printf ("There are %*I64d free Kbytes of virtual memory.\n",
WIDTH, statex.ullAvailVirtual/DIV);
// Show the amount of extended memory available.
printf ("There are %*I64d free Kbytes of extended memory.\n",
WIDTH, statex.ullAvailExtendedVirtual/DIV);
}
MSDN中獲取特定程序內(nèi)存使用情況的例子：
Collecting Memory Usage Information For a Process
To determine the efficiency of your application, you may want to examine its memory usage. The following sample code uses the
GetProcessMemoryInfo function to obtain information about the memory usage of a process.
Copy Code#include <windows.h>#include <stdio.h>#include <psapi.h>void PrintMemoryInfo( DWORD processID ){ HANDLE hProcess; PROCESS_MEMORY_COUNTERS pmc; // Print the process identifier. printf( "\nProcess ID: %u\n", processID ); // Print information about the memory usage of the process. hProcess = OpenProcess( PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, processID ); if (NULL == hProcess) return; if ( GetProcessMemoryInfo( hProcess, &pmc, sizeof(pmc)) ) { printf( "\tPageFaultCount: 0x%08X\n", pmc.PageFaultCount ); printf( "\tPeakWorkingSetSize: 0x%08X\n", pmc.PeakWorkingSetSize ); printf( "\tWorkingSetSize: 0x%08X\n", pmc.WorkingSetSize ); printf( "\tQuotaPeakPagedPoolUsage: 0x%08X\n", pmc.QuotaPeakPagedPoolUsage ); printf( "\tQuotaPagedPoolUsage: 0x%08X\n", pmc.QuotaPagedPoolUsage ); printf( "\tQuotaPeakNonPagedPoolUsage: 0x%08X\n", pmc.QuotaPeakNonPagedPoolUsage ); printf( "\tQuotaNonPagedPoolUsage: 0x%08X\n", pmc.QuotaNonPagedPoolUsage ); printf( "\tPagefileUsage: 0x%08X\n", pmc.PagefileUsage ); printf( "\tPeakPagefileUsage: 0x%08X\n", pmc.PeakPagefileUsage ); } CloseHandle( hProcess );}int main( ){ // Get the list of process identifiers. DWORD aProcesses[1024], cbNeeded, cProcesses; unsigned int i; if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) ) return 1; // Calculate how many process identifiers were returned. cProcesses = cbNeeded / sizeof(DWORD); // Print the memory usage for each process for ( i = 0; i < cProcesses; i++ ) PrintMemoryInfo( aProcesses[i] ); return 0;}
The main function obtains a list of processes by using the
EnumProcesses function. For each process, main calls the PrintMemoryInfo function, passing the process identifier. PrintMemoryInfo in turn calls the
OpenProcess function to obtain the process handle. If OpenProcess fails, the output shows only the process identifier. For example, OpenProcess fails for the Idle and CSRSS processes because their access restrictions prevent user-level code from opening them. Finally, PrintMemoryInfo calls the
GetProcessMemoryInfo function to obtain the memory usage information.
