当开启多个并发的加载时，你应该时刻记住设备支持的所有带宽以及空余内存的数量。
When launching multiple concurrent downloads you should keep in mind total device bandwidth it can support and amount of free memory.
如果不在，或是没有空余的内存区，调度器会交换出内存中的一个普通过程并换进所需过程。
If it is not, and if there is no free memory region, the dispatcher swaps out a process currently in memory and swaps in the desired process.
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