How Long For Os X Yosemite To Mac OS X Update
How Long For Os X Yosemite To Serial ATA Controller

Additionally, for each of these copied files, the installer had to make sure the subdirectories had the exact same meta-data (permissions, owner, reference count, creation date, etc) as before the installation began.

How Long For Os X Yosemite To Mac OS X Update

Share Tweet Why Since the latest Mac OS X update, 10.10 Yosemite, was released last Thursday, there have been complaints springing up online of the progress bar woefully underestimating the actual time to complete installation.

More specifically, it appeared as if, for a certain group of people (myself included), the installer would stall out at two minutes remaining or less than a minute remainingsometimes for hours.

During the install, striking Command L would bring up the install logs.

In my case, the logs indicated that the installer was busy right until the very last minute.

Not knowing very much about OS Xs installation process and wanting to learn more, and wanting to answer why the installation was taking longer than the progress bar expected, I saved the log to a file on my disk with the intention of analyzing it before the installer automatically restarted my computer.

Cleaning The log file from the Yosemite installer wasnt in a format that R (or any program) could handle natively so before we can use it, we have to cleanmunge it.

To do this, well write a program in the queen of all text-processing languages: perl.

This script will read the log file, line-by-line from standard input (for easy shell piping), and spit out nicely formatted tab-delimited lines.

The installation didnt span days (it didnt even span an hour) so technically I didnt need the Month and Day fields, but I left them in for completeness sake.

Analysis Lets set some options and load the libraries we are going to use: options.

Lets make a column for cumulative time by subtracting each rows time by the start time yos.logcumulative In order to see what processes were taking the longest, we have to make a column for elapsed time.

To do this, we can subtract each rows time from the time of the subsequent row.

Which services were responsible for the most writes to the log and what services took the longest We can find out with the following elegant dplyr construct.

While were at it, we should add columns for percentange of the whole for easy plotting.

We can more intuitively view the number-of-entriestime-taken mismatch thusly: melted As you can see, the Unknown process took a disproportionately long time for its relatively few log entries; the opposite behavior is observed with opendirectoryd.

The other processes contribute very little to both the number of log entries and the total time in the installation process.

This ostensibly contains items like all the updated applications (Safari, Mail, etc.).

How Long For Os X Yosemite To Serial ATA Controller

Archiving the old system logs (two and a half minutes) Loading the kernel module that allows the onboard serial ATA controller to work (a little over a minute) Lets view a density plot of the number of writes to the log file during installation.

In particular, there were a very large number of log file writes between 11:47 and 11:48; what was going on here if the first time is in between the second two, this returns TRUE.

In particular, the vast majority of these move operations are moving files related to a program called texlive.

Ill explain why this is to blame for the inaccurate projected time to completion in the next section.

But lastly, lets view a faceted density plot of the number of log files writes by process.

This might give us a sense of what steps go on as the installation progresses by showing us with processes are most active.

Among those who do, though, these directories are littered with hundreds and hundreds of custom files that the installer doesnt and cant have prior knowledge of.

In my case, and probably many others, the estimated time-to-completion was inaccurate because the installer couldnt anticipate needing to copy back so many files to certain special directories after unpacking the contents of the new OS.

How Long For Os X Yosemite To Install