OS X 10.9 Mavericks: The Ars Technica Review by John Siracusa

Author:John Siracusa [Siracusa, John]
Language: eng
Format: epub
Tags: Non-fiction
ISBN: 978-0-9859124-1-3
Publisher: Ars Technica
Published: 2013-10-21T16:00:00+00:00

Given a little leeway to reschedule events, those timers might be coalesced as shown below.

When coalescing timers, Mavericks may delay events by around 100 milliseconds in order to get them to align with other events. (Unlike the example images above, timers will never be fired early in Mavericks; they may only be delayed.) This delay should be imperceptible to the user. In fact, in past releases of OS X, timers routinely experienced similar delays due to preemption from higher-priority processes or I/O tasks, or even just some other work happening on the same event loop. In Mavericks, the difference is that this delay is premeditated and purposeful instead of merely incidental.

Not all timers are created equal when it comes to conserving energy. High-frequency timers are the biggest energy hogs, often firing many times a second, repeatedly waking the CPU from its idle state. When App Nap is activated for an application, the maximum rate that any timer is allowed to fire is severely limited, requiring many seconds between events.

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