disabling atime in OS X

Create the following plist file somewhere useful, e.g. /Library/LaunchDaemons/com.local.noatime.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">


Then run the following to pick up the change, or indeed, reboot:

% sudo launchctl load /Library/LaunchDaemons/com.local.noatime.plist

And you should now see the root file system mounted with noatime option, which should improve longevity of SSD boot drives

# mount
/dev/disk0s2 on / (hfs, local, journaled, noatime)