LVS叢集的負載調度演算法

參考文章出處:http://tech.ccidnet.com/art/302/20050609/265435_1.html註:LVS -- Linux Virtual Server ( 可以實現Linux平台下簡單的負載平衡 ) 1.  核心中的串連調度演算法    在核心中的串連調度演算法上,IPVS已實現了一下八種調度演算法:    輪叫調度(Round-Robin Scheduling)    加權輪叫調度(Weighted Round-Robin Scheduling)   

Ubuntu添加開機自動啟動程式的方法

文章出處:http://hi.baidu.com/gcc_gun/blog/item/fe9bbc4b84e911fa83025cb8.html1. 開機啟動時自動運行程式    Linux載入後, 它將初始化硬體和裝置驅動, 然後運行第一個進程init。init根據設定檔繼續引導過程,啟動其它進程。通常情況下,修改放置在    /etc/rc或    /etc/rc.d

Play pickup about grape planting

Miles (trying to explain to Maya why he is so into pinot noirs): "It's a hard grape to grow. As you know. Right? It's, uh, it's thin-skinned, temperamental, ripens early. It's, you know, it's not a survivor like cabernet, which can just grow

vc工程檔案

.opt   工程關於開發環境的參數檔案。如工具條位置等資訊;      .aps   (AppStudio   File),資源輔助檔案,二進位格式,一般不用去管他.      .clw   ClassWizard資訊檔,實際上是INI檔案的格式,有興趣可以研究一下.有時候ClassWizard出問題,手工修改CLW檔案可以解決.如果此檔案不存在的話,每次用ClassWizard的時候繪提示你是否重建.      .dsp   (DeveloperStudio  

gdb調試(no debugging symbols found)

  gdb  偵錯工具時出現下面資訊:  GNU   gdb   Red   Hat   Linux   (5.3post-0.20021129.18rh)     Copyright   2003   Free   Software   Foundation,   Inc.     GDB   is   free   software,   covered   by   the   GNU   General   Public   License,   and   you   are    

call back function

      對於很多初學者來說,往往覺得回呼函數很神秘,很想知道回呼函數的工作原理。本文將要解釋什麼是回呼函數、它們有什麼好處、為什麼要使用它們等等問題,在開始之前,假設你已經熟知了函數指標。

Why you cant master english

第二,過分講究速度和效率,不願花時間經常重複(複習)已學過的內容,只求懂了則罷。語言的運用既是一種技能,技能則只有靠熟能生巧,要不斷的重複才會熟練,只有熟練了才會形成一種應用自如、不假思索的技能。 第三,三天打魚兩天晒網,沒有恒心,不能長期堅持學習。技能的熟練要有一個過程,在這個過程中會遇到各種困難,但不能向困難低頭,要堅持不懈地反覆學習,持之以恒。

daemon編程規則(為什麼要fork兩次)

文章出處:http://blog.csdn.net/jeffgeng/article/details/5798338                    http://roz1987.blog.163.com/blog/static/116392958201011156149507/     在linux中,每一個系統與使用者進行交流的介面稱為終端,每一個從此終端開始啟動並執行進程,都會依附於這個終端,這個終端就稱為這些進程的控制終端,當控制終端被關閉時,相應的進程都會自動關閉。     

mysql5.5 源碼分析(-)

第一次想分析mysql的源碼要追溯到兩年前,但是直到今天才把源碼下載到本地,真難為情。:)做個備份,好記性不如爛筆頭。sloccount算了一下,整個工程的代碼是百萬行級的,c++,和ascic為主。從規模來看,絲毫不遜色於wps文字。時隔一年半,再把c++撿起來。cpp:         631203 (49.60%)ansic:       543818 (42.74%) 507268  storage      cpp=352539,ansic=144769,cs=4647,perl=24

I found this outside this gentleman’s room

Lesson 24 It could be worseFirst listen and then answer the question.How had the writer's money been stolen?I entered the hotel manager's office and sat down.I had just lost 50 pounds.And i felt very upset.I lost[left] the money in my room. i

為什麼死迴圈佔用CPU高

文章出處:http://bbs.chinaunix.net/thread-1613560-1-1.html 為什麼死迴圈佔用CPU高一個進程如果是死迴圈,那麼佔有的CPU會很高,可是作業系統時間片啟動並執行,到了一定時間不是會自動切換到別的進程嗎?即便是死迴圈,到時間還是會切換到別的進程,為什麼佔用CPU會高呢? scutan 發表於 2009-11-13 22:12因為別的進程也在佔用CPU的資源,如果別的進程休眠或者放棄CPU,發送器又會把這個死迴圈進程調度回來繼續執行。 converse

Design by Contract(1)

http://blog.donews.com/maverick/archive/2006/04/22/841290.aspx       Design by Contract是Bertrand Meyer總結的一項設計技巧,也是Meyer發明的Eiffel語言的主要特點。不過,這條原則的作用範圍並不局限於Eiffel,而是所有的程式設計語言。      Design by Contract的核心是斷言(assertion)。所謂“斷言”,是指永遠為真的布爾型語句,如果不為真,則程式必然存在錯誤。

VOA special english words – a

accuse - v. to say a person is responsible for an act or crime; to make a statement against someone  activist - n. one who seeks change through action  aggression - n. an attack against a person or country; the violation of a country's borders  ally

Beauty of simpleness

One partion contributing to the beauty of a program is its simpleness. It should, accuratelly speaking, be called using another word, abstraction. Few lines of codes which look out of the human comprehension can actually deal with varying situations.

NOSQL 掃盲貼

NOSQL資料庫,資料整理。HBase、Redis、MangoDB為主。其它有趣的也一併摘錄了。 MongoDB介於關聯式資料庫和非關聯式資料庫之間的開源產品,是非關聯式資料庫當中功能最豐富,最像關聯式資料庫

COM技術初探(二)

摘錄的文章,非原創,為了層次清晰,沒有附源碼,要看例子到下面的原文連結去。:)  http://dev.csdn.net/Develop/article/article/25/25203.shtm 三、純手工建立一個COM組件1、從建工程到實現註冊在這一過程中我們將完成三個步驟:建立dll的入口函數,定義介面檔案,實現註冊功能1.1建立一個類型為win32 dll工程建立一個名為MathCOM的win32 dll工程。在嚮導的第二步選擇"A smiple dll

Couch Potato: Life as a Full-Time Television Watcher

Some unusual words describe how a person spends his or her time.  For example, someone who likes to spend a lot of time sitting or lying down while watching television is sometimes called a couch potato.  A couch is a piece of furniture that people

網路丟包率如何解決

摘要 網路丟包是我們在使用ping(檢測某個系統能否正 常運行)對目站進行詢問時,資料包由於各種原因在通道中丟失的現象。ping使用了ICMP回送請求與回送回答報文。ICMP回送請求報文是主機或路由器 向一個特定的目的主機發出的詢問,收到此報文的機器必須給源主機發送ICMP回送回答報文。這種詢問報文用來測試目的站是否可到達以及瞭解其狀態。需要指

The best art critic

Lesson 26 The best art criticFirst listen and then answer the question.Who is the student's best critic?I am an art student.And I paint a lot of pictures.Many people pretend that they understand modern art.They always tell you what a picture is

ask three sounds

Lesson 15 Good newsFirst listen and then answer the question.What was the good news?The secretary told me that Mr Humber would see me.I felt very nervous when i went in[into] his office.He did not look out[up] from his desk when i entered.After i

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