ProcessPriority.cpp File Reference

#include "ProcessPriority.h"
#include "Log.h"

Go to the source code of this file.

Functions
void	SetProcessPriority (std::string const &logChannel, uint32 affinity, bool highPriority)

Function Documentation

SetProcessPriority()

void SetProcessPriority	(	std::string const &	logChannel,
		uint32	affinity,
		bool	highPriority
	)

• Handle affinity for multiple processors and process priority

{
#ifdef _WIN32 // Windows
 
    HANDLE hProcess = GetCurrentProcess();
    if (affinity > 0)
    {
        ULONG_PTR appAff;
        ULONG_PTR sysAff;
 
        if (GetProcessAffinityMask(hProcess, &appAff, &sysAff))
        {
            // remove non accessible processors
            ULONG_PTR currentAffinity = affinity & appAff;
 
            if (!currentAffinity)
            {
                LOG_ERROR(logChannel, "Processors marked in UseProcessors bitmask (hex) {:x} are not accessible. Accessible processors bitmask (hex): {:x}", affinity, appAff);
            }
            else if (SetProcessAffinityMask(hProcess, currentAffinity))
            {
                LOG_INFO(logChannel, "Using processors (bitmask, hex): {:x}", currentAffinity);
            }
            else
            {
                LOG_ERROR(logChannel, "Can't set used processors (hex): {:x}", currentAffinity);
            }
        }
    }
 
    if (highPriority)
    {
        if (SetPriorityClass(hProcess, HIGH_PRIORITY_CLASS))
        {
            LOG_INFO(logChannel, "Process priority class set to HIGH");
        }
        else
        {
            LOG_ERROR(logChannel, "Can't set process priority class.");
        }
    }
 
#elif defined(__linux__) // Linux
 
    if (affinity > 0)
    {
        cpu_set_t mask;
        CPU_ZERO(&mask);
 
        for (unsigned int i = 0; i < sizeof(affinity) * 8; ++i)
            if (affinity & (1 << i))
            {
                CPU_SET(i, &mask);
            }
 
        if (sched_setaffinity(0, sizeof(mask), &mask))
        {
            LOG_ERROR(logChannel, "Can't set used processors (hex): {:x}, error: {}", affinity, strerror(errno));
        }
        else
        {
            CPU_ZERO(&mask);
            sched_getaffinity(0, sizeof(mask), &mask);
            LOG_INFO(logChannel, "Using processors (bitmask, hex): {:x}", *(__cpu_mask*)(&mask));
        }
    }
 
    if (highPriority)
    {
        if (setpriority(PRIO_PROCESS, 0, PROCESS_HIGH_PRIORITY))
        {
            LOG_ERROR(logChannel, "Can't set process priority class, error: {}", strerror(errno));
        }
        else
        {
            LOG_INFO(logChannel, "Process priority class set to {}", getpriority(PRIO_PROCESS, 0));
        }
    }
 
#else
    // Suppresses unused argument warning for all other platforms
    (void)logChannel;
    (void)affinity;
    (void)highPriority;
#endif
}

References LOG_ERROR, and LOG_INFO.

Referenced by main().