我正在使用 OpenGL ES 1.1 和 CADisplayLink 为 3d 场景设置动画。如果 iOS 设备最近重新启动，动画是平滑的，并且两次 displayLink.timestamp 调用之间的时间增量相当均匀。但是在使用 iOS 设备几个小时或几天后，我的应用程序有时会运行几次，动画会变得不稳定，时间增量会上升，然后重置为较低的值，然后再次上升。
像这样：
2012-09-01 23:42:58.770 [2678:707] dt= 0.021139
2012-09-01 23:42:58.787 [2678:707] dt= 0.022183
2012-09-01 23:42:58.804 [2678:707] dt= 0.023223
2012-09-01 23:42:58.820 [2678:707] dt= 0.024270
2012-09-01 23:42:58.837 [2678:707] dt= 0.009679
2012-09-01 23:42:58.853 [2678:707] dt= 0.010750
2012-09-01 23:42:58.870 [2678:707] dt= 0.011766
2012-09-01 23:42:58.887 [2678:707] dt= 0.012806
2012-09-01 23:42:58.903 [2678:707] dt= 0.013847
2012-09-01 23:42:58.920 [2678:707] dt= 0.014890
2012-09-01 23:42:58.937 [2678:707] dt= 0.015933
2012-09-01 23:42:58.953 [2678:707] dt= 0.016976
2012-09-01 23:42:58.970 [2678:707] dt= 0.018011
2012-09-01 23:42:58.987 [2678:707] dt= 0.019055
2012-09-01 23:42:59.003 [2678:707] dt= 0.020097
2012-09-01 23:42:59.020 [2678:707] dt= 0.021143
2012-09-01 23:42:59.037 [2678:707] dt= 0.022181
2012-09-01 23:42:59.054 [2678:707] dt= 0.023222
2012-09-01 23:42:59.071 [2678:707] dt= 0.024288
2012-09-01 23:42:59.087 [2678:707] dt= 0.009624
2012-09-01 23:42:59.103 [2678:707] dt= 0.010728
2012-09-01 23:42:59.121 [2678:707] dt= 0.011763
2012-09-01 23:42:59.137 [2678:707] dt= 0.012808
2012-09-01 23:42:59.153 [2678:707] dt= 0.013847
2012-09-01 23:42:59.170 [2678:707] dt= 0.014891
2012-09-01 23:42:59.187 [2678:707] dt= 0.016002
2012-09-01 23:42:59.203 [2678:707] dt= 0.016979
2012-09-01 23:42:59.220 [2678:707] dt= 0.018016
2012-09-01 23:42:59.237 [2678:707] dt= 0.019042
2012-09-01 23:42:59.253 [2678:707] dt= 0.020099
2012-09-01 23:42:59.270 [2678:707] dt= 0.021138
2012-09-01 23:42:59.287 [2678:707] dt= 0.022185
2012-09-01 23:42:59.304 [2678:707] dt= 0.023222
2012-09-01 23:42:59.320 [2678:707] dt= 0.024265
2012-09-01 23:42:59.337 [2678:707] dt= 0.009681
2012-09-01 23:42:59.354 [2678:707] dt= 0.010736
然后，如果重新启动 iOS 设备，动画又会变得流畅。
当 UpdateAnimation() 函数中几乎没有与游戏相关的计算时，这个问题甚至出现在我的菜单屏幕上。
我不明白发生了什么以及为什么重新启动总能在一段时间内解决这个问题。