How to resolve inaccuracies in queryperformancecounter in C++?

In C++, the QueryPerformanceCounter function is used to get high precision timer values, but sometimes inaccuracies may occur. Here are some possible solutions:

1. Make sure the timer’s time reference is correct: The QueryPerformanceCounter function returns a high-precision timer value, but this value is relative to a specific time reference. Before using it, you need to call the QueryPerformanceFrequency function to obtain the timer’s frequency and divide the timer value by the frequency to get the time (in seconds).
2. Use a more precise timer: Some timers on computers may not be accurate enough, consider using alternative timers. For example, you can use the GetSystemTimePreciseAsFileTime function in the Windows API to obtain more accurate system time.
3. Avoid thread switching on multi-core processors: Thread switching on multi-core processors may lead to inaccurate timer values. You can try using thread affinity to bind the timer thread to a specific CPU core, thus avoiding thread switching.
4. Avoid obtaining timer values when switching processes: When calculating the time for a certain operation, try to avoid getting timer values when switching processes. Instead, get the timer value before the operation starts, then get it again after the operation finishes, and calculate the time difference.
5. Utilize a more advanced timer library: If the above methods are unable to solve the issue, consider using a more advanced timer library such as Boost.Timer or OpenMP. These libraries offer more accurate and reliable timer functions.

Please note that the above solutions may work for certain situations, but they are not guaranteed to resolve all problems. It is important to choose the appropriate solution based on the specific circumstances in practice.