Jeffrey Lott Jeffrey Lott - 27 days ago 13
Android Question

What is EGL and GL mtrack in Android Memory Dump

I'm currently working on a hybrid application that is exhibiting some peculiar memory usage that I'm trying to debug. As soon as the application starts, it appears to be immediately using close to 250MB of memory, which seems excessively given that all we have loaded at that point is the login screen. I've been looking at a few memory profiling tools for Android (the Xamarin profiler and the android profiler shipped with the SDK), but all of them show relatively low heap usage (~10-15MB, which I'm trying to get down). I ran "adb shell dumpsys meminfo APPNAME -d' and got the following trace:

** MEMINFO in pid 24925 [APPNAME] **
Pss Private Private Swapped Heap Heap Heap
Total Dirty Clean Dirty Size Alloc Free
------ ------ ------ ------ ------ ------ ------
Native Heap 19439 19396 0 0 28672 22915 5756
Dalvik Heap 15441 14992 0 0 37319 36837 482
Dalvik Other 542 368 0 0
Stack 432 432 0 0
Ashmem 17388 16508 880 0
Gfx dev 40538 34504 0 0
Other dev 4 0 4 0
.so mmap 6211 224 3080 0
.apk mmap 10531 0 10232 0
.ttf mmap 453 0 260 0
.dex mmap 1263 0 980 0
.oat mmap 635 0 152 0
.art mmap 707 516 24 0
Other mmap 452 4 52 0
EGL mtrack 63508 63508 0 0
GL mtrack 79116 79116 0 0
Unknown 21756 21756 0 0
TOTAL 278416 251324 15664 0 65991 59752 6238


I've been trying to understand what this means by using the documentation provided at: https://developer.android.com/tools/debugging/debugging-memory.html, but that page doesn't seem to have any info on the biggest culprits: Gfx dev, EGL mtrack, GL mtrack, and Unknown. Is there some documentation on what these categories are or why they would grow to be so big?

Thanks

Answer

EGL and GL shows here memory consumed by Graphics layer basically. I am sure you are running "adb shell dumpsys meminfo" command on Android lollipop device. Actually dumpsys meminfo tool/command has been modified in lollipop to calculate and display graphics memory.

In old version (KitKat or older) you can not find EGL and GL information although graphics consumed memory in KitKat or older versions also.

This is we can request Google to update their documentation to explain new memory components also. In short you can say it is bug in documentation of Android. They should update it as per latest implementation of "adb shell dumpsys meminfo" tool/command

References: EGL - http://en.wikipedia.org/wiki/EGL_(API) GL - http://en.wikipedia.org/wiki/OpenGL