Hey folks, So I'm in the midst of creating a game and I'm hitting some occasional slow down which "seems" to be a result of GC calls triggered by other processes on the device. I have profiled *my* app and am 100% certain there are no allocations going on while the game is running, but in certain circumstances (i.e. most of the time) logcat is spewing out GC_CONCURRENT freed...blah blah entries. Here's a typical output from the console:
03-30 23:58:58.868: DEBUG/dalvikvm(2590): GC_CONCURRENT freed 407K, 6% free 8758K/9224K, paused 5ms+3ms, total 29ms 03-30 23:59:05.970: DEBUG/dalvikvm(2590): GC_CONCURRENT freed 408K, 6% free 8757K/9228K, paused 4ms+2ms, total 30ms 03-30 23:59:13.063: DEBUG/dalvikvm(2590): GC_CONCURRENT freed 407K, 6% free 8757K/9224K, paused 4ms+4ms, total 33ms 03-30 23:59:20.142: DEBUG/dalvikvm(2590): GC_CONCURRENT freed 407K, 6% free 8757K/9228K, paused 5ms+3ms, total 30ms 03-30 23:59:27.227: DEBUG/dalvikvm(2590): GC_CONCURRENT freed 407K, 6% free 8757K/9224K, paused 6ms+2ms, total 31ms 03-30 23:59:34.306: DEBUG/dalvikvm(2590): GC_CONCURRENT freed 407K, 6% free 8757K/9232K, paused 4ms+2ms, total 23ms 03-30 23:59:41.392: DEBUG/dalvikvm(2590): GC_CONCURRENT freed 407K, 6% free 8757K/9224K, paused 4ms+2ms, total 27ms 03-30 23:59:48.470: DEBUG/dalvikvm(2590): GC_CONCURRENT freed 407K, 6% free 8757K/9232K, paused 5ms+2ms, total 30ms Now I have no idea which processes are to blame, but I did notice that when "other" events on the device occur it can lead to a spike in (I assume) CPU usage which causes a visible drop in frame rate in the game. For example my wifi connection dropped out one time and the logs went crazy with other processes complaining about a lost connection and trying desperately to tell me about it. This caused a fairly severe jolt in the game dropping the frame rate from 60fps to around 20fps for about a minute while everything settled down and got on with things. I had noted on a previous thread<https://groups.google.com/forum/?fromgroups=#!searchin/android-developers/Garbage$20collector$20suspend/android-developers/85yj9CZEqH4/YIiElemqiuoJ>a statement from Dianne Hackborn: *"as of 1.6 such GCs in a background process can not together take more than ~10% of the CPU from any foreground process that wants to run."* This sounds good, but I'm wondering if this is still the case as of 4.2.2? I am seeing behavior that appears to indicate this may not the case. Is there anything I can do to ensure other processes are not using more than 10% of CPU (or any number really)? Or some other restrictions/priorities that might help alleviate this external resource usage? Thanks, Jason. -- -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
