您还学习了如何对存在性能问题的系统进行故障排除，您可以对虚拟内存进行控制。
You also spent some time troubleshooting a system that had some performance problems that you were able to pin (pardon the pun) on virtual memory.
“虚拟内存占用”一节将详细讨论这个问题。
The "Virtual memory footprint" sections discusses this in more detail.
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。
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.
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