...info (服务信息)service settings（服务设置）service tests (服务测试)大家都比较感兴趣的应该是total call time（总通话时间）：其实使用。
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Truss returns a list of the system calls, the total time spent executing the call, the number of calls, and any errors found.
truss返回系统调用的列表、执行调用耗费的总时间、调用的次数和任何发现的问题。
Blocking methods, such as read , will be counted as the total time, including the time the thread spends being unscheduled and waiting for the call to complete.
对于阻塞方法(例如Read)将会显示总共时间，包括线程正在等待调度以及方法返回的时间。
Refactoring the formula slightly, the total time T_total needed for the call becomes
稍稍重新分解一下公式，调用所需要的总时间 T_total 变为
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