Determining no. of CPU cores available

[cnbp173]

Is there a nice easy way in Qt to determine the number of available cores on a system?

I'm looking for something that is platform independent to check the no. of CPU cores available and configure a parallel job on execution, but need to know what cores I have available to play with.

Cheers

[moridinbg]

Here you go. Easily googled it

static int getCpuCount()
{
    int cpuCount = 1;
 
#if defined(Q_OS_WIN32) || defined(Q_OS_WIN64)
    {
	SYSTEM_INFO    si;
	GetSystemInfo(&si);
	cpuCount = si.dwNumberOfProcessors;
    }
#elif defined(Q_OS_UNIX) && !defined(Q_OS_MACX)
    cpuCount = sysconf(_SC_NPROCESSORS_ONLN);
#elif defined(Q_OS_MACX)
   kern_return_t		kr;
   struct host_basic_info	hostinfo;
   unsigned int			count;
 
   count = HOST_BASIC_INFO_COUNT;
   kr = host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&hostinfo, &count);
   if(kr == KERN_SUCCESS) {
	cpuCount = hostinfo.avail_cpus;
   }
 
#endif
 
    if( cpuCount < 1 )
	cpuCount = 1;
 
    return cpuCount;
}

static int getCpuCount()
{
    int cpuCount = 1;

#if defined(Q_OS_WIN32) || defined(Q_OS_WIN64)
    {
	SYSTEM_INFO    si;
	GetSystemInfo(&si);
	cpuCount = si.dwNumberOfProcessors;
    }
#elif defined(Q_OS_UNIX) && !defined(Q_OS_MACX)
    cpuCount = sysconf(_SC_NPROCESSORS_ONLN);
#elif defined(Q_OS_MACX)
   kern_return_t		kr;
   struct host_basic_info	hostinfo;
   unsigned int			count;

   count = HOST_BASIC_INFO_COUNT;
   kr = host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&hostinfo, &count);
   if(kr == KERN_SUCCESS) {
	cpuCount = hostinfo.avail_cpus;
   }

#endif

    if( cpuCount < 1 )
	cpuCount = 1;

    return cpuCount;
}

To copy to clipboard, switch view to plain text mode 

It may not be the best solution, but I have used it with no problems on several occasions.

[drhex]

Also see QThread::idealThreadCount()

[cnbp173]

Thanks guys - suppose I should have googled. I searched the forum and got nothing.

Cheers