![]() ![]() 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. ![]() 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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