如何找出mach_msg_trap等待什么？ [英] How to find out what mach_msg_trap waits for?

问题描述

我在目标上剖析我的iPhone应用程序，根据Instruments 65％的时间花在 mach_msg_trap 。

我有一个后台线程永远运行，并使用 performSelectorOnMainThread：withObject：waitUntilDone：，大约每2秒将结果发送回主线程。

解决方案

结果我的应用程序实际上并不花费65％的时间在 mach_msg_trap 函数。这是我的一个配置错误。

采样器工具默认为所有采样计数，这将测量所有线程，

I a profiling my iPhone application on target, and according to Instruments 65% of the time is spent in mach_msg_trap.

I have a background thread that runs-forever and send results back to the main thread using performSelectorOnMainThread:withObject:waitUntilDone:, aproximately every 2 seconds. I am not waiting until done.

解决方案

Turn out my app is not actually spending 65% of it's time in the mach_msg_trap function. It was a configuration error in Instruments on my part.

The Sampler tool defaults to All Sample Counts, this will measure all threads regardless of their state.

Instead switch to Running Sample Times that will reflect the current actual workload.

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