我对不同的数据库系统进行了一些当地试验。 在我执行询问之前和之后,我从<代码>/proc/status收集(摘要)。 差异应当告诉我, j或 US。 HZ 工作时间。 但是,如果(根据<代码>clock_gettime(>)查询的操作时间低于0.001秒,则差异为零。 这是否是为了迅速利用万国邮联的信息,还是我没有其他东西?
A jiffy, as of-030 kernel 2.6.0, is 1/250 of a second, or 0.004 seconds [see ,time(7)]。 你们永远不会得到比这小的解决。
我建议你使用<代码>rdtsc指示,该指示可能作为汇编者本身提供。 这在每1个万国邮联的标尺上都得到了加强,这样,你就可以获得所通过时间的频率。 http://www.mcs.anl.gov/~kazutomo/rdtsc.html” rel=“nofollow”随附在网上。
事实上,要检查<条码>/proc/status的细微缩略词,因为开立案卷和阅读内容的良机实际上要长于您的询问。 <代码>rdtsc更为可靠。
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