Windows timer resolution

TimerResolution is an application to change the resolution of the default windows timer. The standard timer on Windows XP can vary between and milliseconds. High- Resolution Timers.

Starting with Windows 8. ExXxxTimer routines to manage high- resolution timers. The default timer resolution on Windows is 15.

When programs increase the timer frequency they increase power consumption and harm battery life. They also waste more compute power than I would ever have expected – they make your computer run slower! Various methods for obtaining high resolution time stamping on Windows have been described.

The most promising implementations have been proposed by W. A substantial amount of time and effort has been spent on the attempt to get a proper high resolution time service implemented for Windows. However, the performance of these implementations is still not satisfactory. The complexity arises from the variety of Windows versions running on an even greater variety of hardware platforms.

Proper implementation of an accurate time service for Windows will be discussed and diagnosed within the Windows tim. Se hela listan på windowstimestamp.

Time resources on Windows are mostly interrupt controlled entities. However, for several reasons they can and shall never be set to anything near the μs regime. Therefore, they show a certain granularity. It is a fast access API that is able to hold sufficiently accurate (1ns units) values in its arguments. The best resource for retrieving the system time is the GetSystemTimeAsFileTime API.

The alternative API is GetSystemTime, which is times slower, has double the structure size, and does not provide a well-suited data format. An interrupt independent system resource is used to extend the accuracy into the microsecond regime i. The performance counter API provides the. The Windows Timestamp Project provides the tools to enable access to time at microsecond resolution and accuracy.

Furthermore, it provides timer functions at the same resolution and accuracy. The high accuracy and microsecond resolution are archived by synchronizing the system time with the performance counter. In fact, the performance counter is phase locked to the system time.

The drift of the performance counter is permanently evaluated and taken into account while the system is running. The code runs in a real-time priority process providing time information. An auxiliary IO process builds the interface to an optional graphical user interface. Nonblocking IO enables proper performance testing and debugging.

Only two hardware platforms were described here to highlight some of the problems to bear in mind when implementing reliable time services for Windows. Many more configurations need to be diagnosed to ensure platform independent functionality to a large extent.

However a flexible and automatic evaluation of hardware specific behavior may result in hardware independence. The implementation of all the above into a time service is done by careful separation into different processes and threads. The time critical parts are hosted by a process running at real-time priority class. Some of the threads inside this process are even running at time-critical priority level. This is the Kernel and hosts the time service routines.

For testing and debugging the Kernel process has some IO capabilities shared with the IO process. A later version may not need this additional functionality. Microsecond resolution time stamps are possible on Windows systems.

Resolution in the microsecond regime can be observed at accuracies of a few microseconds without distracting the system too much. Timer functions at the same resolution and accuracy are implemented and tested. Handling many timed events created by those timer functions set up to fire within the same millisecond is tricky but possible.

The evaluation at the startup of the services may sometimes take a few seconds and needs all the CPU time. Fine granularity time services are established with the tools described above. Granularities of 15. The time keeping has improved. NTP synchronization.

GHz) and the second is generally programmable down to a period of 1ms (though newer chips (HPET) have higher resolution ). Timer Resolution is a tool that allows you to change the default Windows timer resolution , which is between and milliseconds. Its use is simple, just open the program that does not need installation and weighs only KB and set the two configuration parameters (if you wish) present in the application interface. Windows uses the lowest value (that is, highest resolution ) requested by any process. Setting a higher resolution can improve the accuracy of time -out intervals in wait functions.

However, it can also reduce overall system performance, because the thread scheduler switches tasks more often. Having it set unnecessarily low is a waste of power, especially noticeable on laptops. Chrome used to set it to 0. I forcibly stopped it from doing so. Easily change resolution of your default Windows OS timer.

When i run with cmd the command powercfg -energy duration 5: I take that platform time resolution is idle and 15. However, Windows and Windows 8. The first has a resolution of around ~0. TimeAdjustment during TimeIncrement.

In absence of ini-file second version does the same logic as first version. In presence of empty ini-file second version does nothing at all.