extract2, when we know the final size of the slice, we do one heap
U.getAndAddLong(this, CTL, AC_UNIT); // 醒来后恢复活跃计数
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These times might sometimes differ substantially - it is because for some test cases, there is a need to fetch existing data from DB in order to construct test queries. Duration of these additional queries is subtracted from the total test duration: Queries duration = Total test duration - Additional queries duration. Otherwise they would skew results, adding time where it should not be counted.，更多细节参见体育直播
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