Timer difference in Linux and Windows

[ortegahernandes]

When I do a simple count within the Lazarus timer function on Windows and Linux, if the timer is defined with low values ​​ex 2 ms, there is a large discrepancy in values ​​between the operating system.

Is this normal?

[marcov]

Yes

[DragoRosso]

In windows the normal timing resolution is 1 ms. (or less in the new hardware) but the consistency is near 16 ms. This means that when you have a timing or sleep or others look at step of 16 ms.

The events should be between less than value that you imposed and near 16 / 17 ms.

In Linux I don't know.

Example: if you set the timer to 10 ms. the events may signals between 8 to 17 ms. (this is an example, every time you do this the timing is different).

You can use a SysInternals Util https://learn.microsoft.com/it-it/sysinternals/downloads/clockres to view your config in Windows.

Clockres v2.1 - Clock resolution display utility
Copyright (C) 2016 Mark Russinovich
Sysinternals

Maximum timer interval: 15.625 ms
Minimum timer interval: 0.500 ms
Current timer interval: 1.000 ms

You can change the "maximun interval" using MMSystem, with timebeginperiod(1) and timeendperiod(1) functions ... see Microsoft documention CAREFULLY: https://learn.microsoft.com/en-us/windows/win32/api/timeapi/nf-timeapi-timebeginperiod

[Thaddy]

Yes

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