Android app reason of large RAM usage and how to reduce
When I launch and exit my app several times its RAM usage increases reaching over 500 mb. When I checked memory dump using adb shell dumpsys meminfo I checked unknown pss value is cause of problem. What is reason of large pss value and how I can reduce pss value.
Shared Private Heap Heap Heap
Pss Dirty Dirty Size Alloc Free
------ ------ ------ ------ ------ ------
Native 0 0 0 534460 531827 1604
Dalvik 51013 17868 50664 90480 82266 8214
Cursor 0 0 0
Ashmem 0 0 0
Other dev 14292 52 14288
.so mmap 3810 2320 1720
.jar mmap 0 0 0
.apk mmap 1305 0 0
.ttf mmap 0 0 0
.dex mmap 2960 0 0
Other mmap 1738 440 236
Unknown 504718 296 384284
TOTAL 579836 20976 451192 624940 614093 9818
Answer
I found out reason of high RAM usage. When I analyzed native heap dump of app I got to know that instances of library libharfbuzz.so was taking up huge space and that library is used for displaying fonts, so when I checked code there were lot of instances of TypeFace cretaed in code at number of places. As TypeFace are allocated in native memory and it makes native heap size large thats why RAM usage was more. I removed those instances and created single TypeFace instance and used it in my app and RAM usage was decreased.