If the disk is the same as the one used for virtual memory, then it might be a problem with lack of memory and too much swapping.

如果该磁盘同时用作虚拟内存，那么可能是因为缺少内存和过多的交换的问题。

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Experimental results show that this method extends the problem sizes that can be efficiently solved and its performance is better than the virtual memory system while the data set is large.

实验结果表明，该方法扩展了可有效解决的核外问题规模，大数据量时的计算性能优于虚存系统。

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Finally, the concept of virtual memory and the solution to virtual memory too low problem are elaborated.

最后介绍了虚拟存储器的概念及虚拟存储器太小时的解决办法。

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