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10.4: Play with the fake startup progress bar
One thing this article failed to mention was that the OS writes the previous boot time to /var/db/loginwindow.boottime, which WaitingForLoginWindow uses to pace itself. Therefore, I wouldn't say it's "Fake", but it's rather time-oriented instead of process-oriented. My old Apple ][gs was the same way - the progress bar came up while the OS was still in la la land, bringing itself up. Apple is all about smoothness and elegance, and a process (or events) based progress bar is chunky, inaccurate, and one of the things we all hate about windows (sitting there at 99% for 10 minutes). By having a progress bar that bases itself on actual estimated boot time, you have a smoother and more accurate bar...I personally like it.
10.4: Play with the fake startup progress bar
Perhaps fake isn't the correct term, instead one could call it a place holder. The fact that it writes it's previous time to a file and uses that to guage the speed of the progress bar upon the next boot implies that it is a place holder rather than a real progress bar. It isn't guaging how fast your computer is actually starting up nor is it giving you an indication of what is actually happening it is simply giving you an estimate based off of previous starts. This is nice if you regularly shut down your computer but if you only shut down infrequently of for software updates then the bar can be practically meningless.
10.4: Play with the fake startup progress bar
AIUI, it's not showing you how fast the computer's actually booting up, because it can no longer TELL how fast the computer's booting up. It has a list of services to start; in previous version, it would start one and then wait for it to complete before starting the next; so it was easy to tell how far it'd got. Now, though, it starts them all in parallel, which can be much faster, but means you don't get the nice linear progress measurement -- you just have to wait until they're all done. |
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