设置流量控制时间间隔 flow-interval
可以设置时间间隔，小到两分钟，大到整个数据集。
The time interval can be set from a little as two minutes to up to the whole data set.
可以用时间滑块来设置时间间隔，如图 7 所示。
The time interval can be set using the time slider as shown in Figure 7.
没有设置最短的时间间隔，而是通过可用内存统计信息的变化得出。
The period of time for the shortest intervals is not set but is derived by the variance of the free memory statistics.
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