在一個 CPU LOAD 老是在 100% 的工作站上，仔細的將每一個程式的執行優先權分類一下，可以大幅提升每個執行中程式的運作效能。像是 MRTG 這種東西都應該盡量以較低的優先權來執行，才能避免影響到需要高執行效能的程式運作，這時可以利用 nice 和 renice 兩個指令來設定優先權。
例如 nice -n 15 /usr/local/bin/mrtg mrtg./usr/local/etc/mrtg.cfg
其中的 15 指的是這個程式執行時的 "NICE value"。NICE value 愈高，代表優先權愈低，但只有 superuser 能夠設定低於 0 的值。若是想要改變一個執行中程式的優先權就是利用 renice，用法幾乎一樣，同樣的只有 superuser 能夠設定低於 0 的值。對於想要有穩定且高執行效率的程式，便應該將 nice 值調低，相反則調高，其 NICE value 可以由 top 或 ps -l 指令查閱。
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