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I connect my android phone to eclipse. And I see these message from Logcat. Can you please tell me what does is the difference between 'GC_EXPLICIT' and 'GC_EXTERNAL_ALLOC'? and what does "45% free" mean?
10-05 12:08:34.450: DEBUG/dalvikvm(813): GC_EXTERNAL_ALLOC freed 63K, 45% free 3156K/5703K, external 4113K/4348K, paused 73ms
10-05 12:08:34.480: DEBUG/dalvikvm(101): GC_EXTERNAL_ALLOC freed 55K, 40% free 5883K/9799K, external 4911K/4913K, paused 124ms
10-05 12:08:37.120: DEBUG/dalvikvm(101): GC_EXPLICIT freed 84K, 41% free 5870K/9799K, external 5745K/6078K, paused 104ms
10-05 12:08:40.099: DEBUG/dalvikvm(493): GC_EXPLICIT freed 14K, 48% free 3782K/7175K, external 1625K/2137K, paused 75ms
10-05 12:08:45.110: DEBUG/dalvikvm(188): GC_EXPLICIT freed 57K, 54% free 3203K/6855K, external 4988K/6206K, paused 78ms
10-05 12:09:05.119: DEBUG/dalvikvm(822): GC_EXPLICIT freed 349K, 46% free 3696K/6727K, external 1625K/2137K, paused 65ms
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Garbage collection (GC) is a memory recovery feature built into programming languages such as C# and Java. A GC-enabled programming language includes one or more garbage collectors (GC engines) that automatically free up memory space that has been allocated to objects no longer needed by the program.
Garbage collection A managed memory environment, like the ART or Dalvik virtual machine, keeps track of each memory allocation. Once it determines that a piece of memory is no longer being used by the program, it frees it back to the heap, without any intervention from the programmer.
Kotlin/Native garbage collector The original Kotlin/Native automatic memory manager uses a deferred reference-counting garbage collector. We chose it for its simplicity – not because of its memory consumption. But this original choice is now a roadblock to improving Kotlin/Native's performance and developer experience.
The gc() method is used to invoke the garbage collector to perform cleanup processing. The gc() is found in System and Runtime classes.
I would highly suggest giving the Memory Management video presentation from Google I/O 2011 a watch:
http://www.youtube.com/watch?v=_CruQY55HOk
At about 14 minutes in, he goes in to depth on exactly what these mean in the logcat output.
GC Explicit basically means that an app has explicitly called System.gc();
GC Concurrent is triggered when your heap starts to fill up and a Concurrent GC kicks in to hopefully clear memory before it fills up.
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