What the unified buffer cache is unifying

Pretty much all Unixes these days have what is called a unified buffercache. If you don't know something about Unix history, this name is alittle puzzling, because what is it unifying?

The simple explanation is that originally Unix had the buffer cache,which cached blocks of recent disk IO (whether directly from userprocesses via read() and write() , or from internal kernel IO), andprocess virtual memory, used for the code and data of running processes.The buffer cache was statically


從密雲到太空漫遊

(半癱狀態之下寫成,錯漏還待各位補充。)

自家雜碎

每年七一都裙拉褲甩。今年在鵝頸橋街市尼泊爾人的布店裡買了兩幅紗布,上到廿九几,已經兩點。紗布漂亮但疏漏,兩點半兩點半了,口號還未想到,一眾廿九几藝術家冷
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孩子

孩子
你們就是在如此 僵化 的城市長大
....!!!
太悶熱了。

The optimization rule for systems

One of the rules of optimizing program performance is that there isno point in optimizing code that is not run very often; you optimizethe performance critical code, and then move on to other work. Thereis a similar principle in system design and system administration: improving an area that is not a concern to people does not reallyexcite them . To significantly improve people's lives, you have to workon something that they care about, something that is hurting them now.

An important consequence of people not caring


雨中尋雨,縫裡的縫

零三年以來,每年都去七一,每年都盼好天、盼多人,從來沒有像今年一樣,盼望嘩啦嘩啦下雨,愈暴烈愈好,洗去浮誇的壓倒性慶祝,以灰暗的天替我們流冷汗,隱喻我們的憂患與壓抑,讓我們想起十年前所恐懼的,如何偷偷

拍馬屁聲響足一世紀


路路公主和空姐的真身


Weekly spam summary on June 30th, 2007

This week, we:

  • got 10,108 messages from 265 different IP addresses.
  • handled 22,107 sessions from 2,055 different IP addresses.
  • received 271,991 connections from at least 75,816 different IPaddresses.
  • hit a highwater of 13 connections being checked at once.

Volume is definitely up from last week .As the per day table illustrates, spammers seem to still preferWednesday for their big day:

Day

19


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大學情侶 棄屍校園
衣不蔽體 死因迷離

【本報消息】昨日清晨,XX大學一名校工在該校後山一棵大樹下發現一具全裸女屍,馬上通知校方報警。警方到場調查,在女死者伏屍處不足20米外一草叢中發

20070630 網摘 – 燢足十年

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