I noticed that the size of the logcat buffer varies on different devices. Assuming I have root permissions on my device, is there a way to change the buffer size of the main buffer at runtime? If not, then assuming I can rebuild the Android image, how do I change it at compile time? I’m looking to enlarge it for diagnostic purposes.
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According to the android-developers newsgroup:
The log buffers on the device are 64KB. The timestamp, process ID, and log level are stored in a compact format, so you may actually get more than 64KB of formatted data out of logcat -d -v <mode>.
No as per here it seems that the log buffers on the device are 64KB. The timestamp, process ID, and log level are stored in a compact format, so you may actually get more than 64KB of formatted data out of logcat -d -v <mode>
See also What is the size limit for Logcat?
Anyway for saving logs elsewhere you have: http://developer.android.com/tools/debugging/debugging-log.html that maybe could help you.
Buffer size is determined by the kernel, found in */drivers/staging/android/logger.c
Which buffers are used and the size has changed with Android Versions. Android 3.0 and newer also have a system buffer, and all four are 256kb. You have to recompile the kernel to change it.
You can increase the value of idea.cycle.buffer.size=1024 in property file android-studio/bin/idea.properties. This worked for me.
The “Logger buffer size option” of the Developer options settings of the phone allows to set it to a few values between 64k and 16M.
adb logcat -g then immediately shows the update limit.
Tested on 5.1.1, and this answer claims that it is a recent addition.
Set the size of the log ring buffer. Can add K or M at the end to indicate kilobytes or megabytes
adb logcat -G <size>
Example: adb logcat -G 512K