The ability to correlate / show on the same timeline other events.
A visual UI showing the longest duration operations and those gaps.You also want to get quickly be able to jump to where something started without doing the duration math. You have to find which operations are long, which is not trivial with a search pattern looking at thousands of entries with different log formats and time formats. Calculation of duration information (how long something took).This is useful for quickly finding big jumps / gaps in the logs indicative of a long operation. Ability to automatically display & measure relative time differences between log statements.More features will be covered below but initially some of the benefits are: However, when analyzing performance, a bunch of useful features become available that would be cognitively difficult for a human analyst to easily perform. If you are just looking at diagnostics or errors, looking at the log with grep or your favorite text viewer should suffice. Why is it useful to have this logcat log supported in the tooling? So Perfetto is great for analyzing run-time perf after the system is booted, but currently doesn’t cover boot very well, even on the upcoming Android 13. The Perfetto tracing starts after kernel sometime in usermode, and only captures at best 1/2 to 1/3 of total boot. There is no Linux or Android deep tracing that I know of that covers kernel boot.
The answer is yes Perfetto is great for deep level system tracing, but one shortcoming is that Perfetto doesn’t cover the boot scenario very well. Logcat is useful in general, but why do we find it useful for performance work? Don’t we already have an official performance tooling available with a full-featured and system-level Perfetto tracing? This is what the logcat log would look like when loaded in Windows Performance Analyzer (WPA) Logcat for performance Logcat is a text-based dump of system & app messages on Android. We recently added support for parsing Android logcat logs to the OSS Microsoft-Performance-Tools-Linux-Android project.
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