怎么看系统负载uptime参数

anddyhua

于 2012-06-16 18:12:51 发布

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分类专栏： Note for U/Linux 文章标签： numbers parameters system command osx google

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本文解释了如何通过uptime命令分析服务器负载平均值，并提供了判断何时需要关注的具体指标。重点关注五到十五分钟的平均值，当十五分钟平均值持续高于处理器核心数时，表明系统可能存在问题。

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nice passage explains how to analyse the parameters in uptime command ref：http://blog.scoutapp.com/articles/2009/07/31/understanding-load-averages

I'VE underlined the answer.

Which average should I be observing? One, five, or 15 minute?

For the numbers we've talked about (1.00 = fix it now, etc), you should be looking at the five or 15-minute averages. Frankly, if your box spikes above 1.0 on the one-minute average, you're still fine. It's when the 15-minute average goes north of 1.0 and stays there that you need to snap to. (obviously, as we've learned, adjust these numbers to the number of processor cores your system has).

So # of cores is important to interpreting load averages ... how do I know how many cores my system has?

cat /proc/cpuinfo to get info on each processor in your system.Note: not available on OSX, Google for alternatives. To get just a count, run it throughgrep and word count: grep 'model name' /proc/cpuinfo | wc -l