There is another folder named dsc which contains similar files. These include crash events and other items which overflow single line entries in the log. var/db/uuidtext/ contains a series of folders, named 00 to FF, each containing files named by UUID for specific log events, which extend beyond normal log entries.
A series of plain text files named logdata.statistics.0.txt and others in numeric sequence – the log logs.These contain binary data about time synchronisation between log events and the high-resolution Mach system clock.
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The folder timesync, which contains timesync files numbered in order, extending back to the Sierra upgrade over a year ago.The folder Special, which contains additional tracev3 files holding supplementary log content.The folder Persist, which contains the main tracev3 files for the log as saved to disk.Other folders in /var/db/diagnostics/ and /var/db/uuidtext/ contain ancillary information for those logs. Log contents are stored as tracev3 files – an undocumented compressed binary format – in /var/db/diagnostics/Persist/ and /var/db/diagnostics/Special/. As Apple’s team stated in their 2016 presentation “we want as much logging on all the time as possible”. More significant entries may be written into a system or console log, but there is no centralised log in which everything is recorded.Īpple’s grand design eliminates almost all other logs (macOS Server and some services still maintain their own, though), and fills a single unified log with many hundreds or thousands of log entries every minute. They’re easy to access, entries are relatively sparse, and they are separated into different voices: printing system errors and other log entries will normally go into one or more print logs, for example. Traditional logs, found on most conventional Unix systems, are a bunch of text files stored in several different folders. This article is a small step forward in understanding the unified log, which is used in iOS, watchOS, and tvOS too.
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Inevitably, the focus at WWDC was on explaining to developers how to write to the new log, and precious little was revealed about the log itself. At the time, at WWDC in June 2016, it was all rather novel, and didn’t arrive until the release of macOS Sierra the following September (2016). It has been well over a year since Apple told us much about the new unified log which it introduced in Sierra, and continues in High Sierra.
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