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I have noticed that my battery life is significantly worse on my laptop whenever I have the delphi 2010 ide open. When I powercfg /energy trace, it shows (among other things) that bds.exe has requested a smaller timer resolution than the default of 15.6ms.
Current Timer Resolution (100ns units) 10006
Maximum Timer Period (100ns units) 156250
Requested Period 10000
Requesting Process ID 7996
Requesting Process Path \Device\HarddiskVolume2\Program Files (x86)\Embarcadero\RAD Studio\7.0\bin\bds.exe
Does delphi have a good reason to alter the platform timer resolution? Also do the latest versions of the ide have the same behavior?
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The default platform timer resolution is 15.6ms (15625000ns) and should be used whenever the system is idle. If the timer resolution is increased, processor power management technologies may not be effective. The timer resolution may be increased due to multimedia playback or graphical animations.
The standard windows timer has an interval of 10 to 25 miliseconds, timer resolution claims to be able to change that to 0.5 miliseconds.
The IDE uses a very old version of VirtualTrees.pas for the ProjectManager, StructureView and Log-Window. This version calls timeBeginPeriod in its InitializeGlobalStructures function and sets the timer resolution to the minimum (1). It is reset in the unit's finalization block.
VirtualTrees changed this behavior with this commit:
2013-09-20 21:40:21: No longer changing timer resolution globally (#365)
But the IDE still uses a very old version that isn't even using UnicodeString but WideString. So it wasn't updated since Delphi 2007.
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