Is/was 2590 your process? On Sunday, March 31, 2013 8:07:50 AM UTC+1, Jason wrote: > > 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. >
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