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I suppose your question does not include change detection, as your sample only concerns QgsMapCanvas.refresh()

Instead you have to call QgsRasterLayer.triggerRepaint()

If your layer is called myLayer:

myLayer.setCacheImage( None )
myLayer.triggerRepaint()

The same method exists for vector layers as well.

For low overhead change detection I'd propose looking into the following (unfortunately platform specific) API's

• inotify (pyinotify, Linux)
• FindFirstChangeNotification (pywin32, Windows)