linux 系统top 中 %CPU
时间: 2025-03-07 09:06:55 浏览: 29
### Linux `top` Command `%CPU` Meaning and Interpretation
In the context of monitoring system performance on a Linux machine, understanding what each column means within tools like `top` is crucial. The `%CPU` field displayed by the `top` command represents the percentage of CPU usage that occurred while the process was executing during the last period of time measured.
The value shown under `%CPU` indicates how much processing power a particular task consumes relative to all available CPUs or cores. For instance, if a single-core processor has one thread using 50%, this suggests half of its capacity is being utilized by said thread at any given moment[^2]. On multi-core systems, it's possible for processes to exceed 100% as they can span across multiple processors simultaneously.
For more precise analysis:
- A higher number signifies greater utilization.
- Values over 100 indicate multithreaded applications running concurrently on several cores.
- When observing `%CPU`, consider also looking into other metrics such as memory consumption (`%MEM`) which shows proportionate RAM use per application.
To better visualize these concepts, here’s an example demonstrating how to run `top` with specific sorting criteria focused on CPU usage:
```bash
top -b -n 1 -o +%CPU | head -n 12
```
This command runs `top` in batch mode (-b), captures only one iteration (-n 1), orders results based on descending order of `%CPU` values (+%CPU), and limits output lines to twelve (head -n 12).
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