How to determine the hardware (CPU and RAM) on a machine?
Solution 1
Here is one method for getting the information you want on a Windows machine. I copied and pasted it from an actual project with some minor modifications, so feel free to clean it up to make more sense.
int CPUInfo[4] = {-1};
unsigned nExIds, i = 0;
char CPUBrandString[0x40];
// Get the information associated with each extended ID.
__cpuid(CPUInfo, 0x80000000);
nExIds = CPUInfo[0];
for (i=0x80000000; i<=nExIds; ++i)
{
__cpuid(CPUInfo, i);
// Interpret CPU brand string
if (i == 0x80000002)
memcpy(CPUBrandString, CPUInfo, sizeof(CPUInfo));
else if (i == 0x80000003)
memcpy(CPUBrandString + 16, CPUInfo, sizeof(CPUInfo));
else if (i == 0x80000004)
memcpy(CPUBrandString + 32, CPUInfo, sizeof(CPUInfo));
}
//string includes manufacturer, model and clockspeed
cout << "CPU Type: " << CPUBrandString << endl;
SYSTEM_INFO sysInfo;
GetSystemInfo(&sysInfo);
cout << "Number of Cores: " << sysInfo.dwNumberOfProcessors << endl;
MEMORYSTATUSEX statex;
statex.dwLength = sizeof (statex);
GlobalMemoryStatusEx(&statex);
cout << "Total System Memory: " << (statex.ullTotalPhys/1024)/1024 << "MB" << endl;
For more information, see GetSystemInfo, GlobalMemoryStatusEx and __cpuid. Although I didn't include it, you can also determine if the OS is 32 or 64 bit via the GetSystemInfo function.
Solution 2
On Windows you can use GlobalMemoryStatusEx to get the amount of actual RAM.
Processor information can be obtained via GetSystemInfo.
Solution 3
For Linux with GCC you can use a very similar solution like windows. You need to include the <cpuid.h>
and you need to modify the input for the __cpuid()
method based on this.
#include <cpuid.h>
char CPUBrandString[0x40];
unsigned int CPUInfo[4] = {0,0,0,0};
__cpuid(0x80000000, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
unsigned int nExIds = CPUInfo[0];
memset(CPUBrandString, 0, sizeof(CPUBrandString));
for (unsigned int i = 0x80000000; i <= nExIds; ++i)
{
__cpuid(i, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
if (i == 0x80000002)
memcpy(CPUBrandString, CPUInfo, sizeof(CPUInfo));
else if (i == 0x80000003)
memcpy(CPUBrandString + 16, CPUInfo, sizeof(CPUInfo));
else if (i == 0x80000004)
memcpy(CPUBrandString + 32, CPUInfo, sizeof(CPUInfo));
}
cout << "CPU Type: " << CPUBrandString << endl;
Solution 4
On Windows to determine CPU clock speed:
double CPUSpeed()
{
wchar_t Buffer[_MAX_PATH];
DWORD BufSize = _MAX_PATH;
DWORD dwMHz = _MAX_PATH;
HKEY hKey;
// open the key where the proc speed is hidden:
long lError = RegOpenKeyEx(HKEY_LOCAL_MACHINE,
L"HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0",
0,
KEY_READ,
&hKey);
if(lError != ERROR_SUCCESS)
{// if the key is not found, tell the user why:
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
lError,
0,
Buffer,
_MAX_PATH,
0);
wprintf(Buffer);
return 0;
}
// query the key:
RegQueryValueEx(hKey, L"~MHz", NULL, NULL, (LPBYTE) &dwMHz, &BufSize);
return (double)dwMHz;
}
Solution 5
The CPU is easy. Use the cpuid
instruction. I'll leave other posters to find a portable way to determine how much RAM a system has. :-)
For Linux-specific methods, you can access /proc/meminfo
(and /proc/cpuinfo
, if you can't be bothered to parse cpuid
responses).
Robert Gould
Master Server Engineer & Game Developer, building MMOs, mobile games and social games for a few millions of users over the last few years. Currently working with Node.js, Actionscript, Redis, and other fun stuff. Specialist in programming languages, scripting engines, analytics, concurrency, lock-free programming, networks, persistence and data-driven game development.
Updated on July 09, 2022Comments
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Robert Gould almost 2 years
I'm working on a cross platform profiling suite, and would like to add information about the machine's CPU (architecture/clock speed/cores) and RAM(total) to the report of each run. Currently I need to target Windows and Unix, so I need methods to obtain this information from both platforms, any clues?
Edit: Thanks for the great answers, Now I got CPU architecture, CPU number of cores and total Memory, but I'm still lacking a clockspeed for the CPU any ideas for that one?
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araqnid almost 15 yearsAnd presumably how to find CPU information on a processor that doesn't have any sort of CPUID instruction? ;) (Would CPUID even tell you how many cores the processor package had?)
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C. K. Young almost 15 yearsRead: intel.com/design/processor/applnots/241618.htm (short answer: yes). All bets are off if the CPU is too old to support cpuid, but no modern system has this issue.
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araqnid almost 15 yearsI was thinking that not all systems are based on i386-architecture processors. (Although aware that this possibly wasn't a situation the OP was interested in)
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C. K. Young almost 15 yearsBleh, all the world's an x86/x64! :-P (Just kidding.)