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 android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com 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 android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
