Jeff Dean:(也稱Jeffrey Adgate Dean)是一名美國計算機科學家和軟件工程師,出生於1968年,畢業於華盛頓大學,主要做品有《MapReduce》等。java
主要成就:git
Jeffrey Dean,簡單來講,這貨是Google牛逼的源泉之一。由於此人實在太牛了,因而出現了關於他有多牛的幾個笑話,直接笑翻,和你們共享下。面試
- During his own Google interview, Jeff Dean was asked the implications if P=NP were true. He said, "P = 0 or N = 1." Then, before the interviewer had even finished laughing, Jeff examined Google’s public certificate and wrote the private key on the whiteboard.
當他被Google面試時,Jeff Dean被問及若是P=NP意味着什麼。他說,「P=0 或者 N=1」。而後,在全部的面試官還沒笑完以前,Jeff瞄了一眼Google的公共證書而後在白板上寫上了對應的私鑰。算法
- Compilers don’t warn Jeff Dean. Jeff Dean warns compilers.
編譯器歷來不給Jeff編譯警告,而是Jeff警告編譯器spring
- The rate at which Jeff Dean produces code jumped by a factor of 40 in late 2000 when he upgraded his keyboard to USB 2.0.
在2000年後段,Jeff碼代碼的速度忽然激增了40倍,緣由是他把本身的鍵盤升級到了USB 2.0數據庫
- Jeff Dean builds his code before committing it, but only to check for compiler and linker bugs.
Jeff仍是會在提交代碼前把它們編譯一遍,不過這麼作的目的只是爲了檢查下編譯器和連接器有沒有bug編程
- All pointers point to Jeff Dean.
全部指針都是指向Jeff的服務器
- gcc -O4 emails your code to Jeff Dean for a rewrite.
gcc的-O4優化選項是將你的代碼郵件給Jeff重寫一下網絡
- The speed of light in a vacuum used to be about 35 mph. Then Jeff Dean spent a weekend optimizing physics.
光在真空中的速度曾近是35英里每小時,後來Jeff花了一個週末對物理學進行了小小的優化session
- Jeff Dean was born on December 31, 1969 at 11:48 PM. It took him twelve minutes to implement his first time counter.
Jeff出生於1969年12月31日的下午11點48分,而後他花了整整12分鐘的時間實現了他的第一個計時器。(背景:計算機中的計時器數值一般被設計爲從1970年1月1日0點0分0秒到當前爲止的秒數)
- When Jeff Dean sends an ethernet frame there are no collisions because the competing frames retreat back up into the buffer memory on their source nic.
當Jeff向以太網發送一個數據包時歷來不會有衝突,緣由是原本要和它有衝突的包都默默撤回了緩衝區
- Unsatisfied with constant time, Jeff Dean created the world's first O(1/n)algorithm.
Jeff對常量的時間複雜度並不知足,因而他創造了世界上第一個O(1/n)的算法。(即隨着問題規模的增大,其解決問題所花的時間會越短)
- Jeff Dean was forced to invent asynchronous APIs one day when he optimized a function so that it returned before it was invoked.
Jeff曾被迫發明了異步API,緣由是經他優化後的某個函數會在調用開始前返回
- When Jeff Dean designs software, he first codes the binary and then writes the source as documentation.
當Jeff寫軟件時,他是直接碼機器碼的。寫源代碼只是爲了做爲文檔使用。
- Jeff Dean wrote an O(n^2) algorithm once. It was for the Traveling Salesman Problem.
Jeff曾無奈寫過一次O(n^2)的算法,其解決的問題是旅行商問題。(該問題是NPC的,即計算機中最複雜最難解決的一類問題,許多人相信這些問題是沒有多項式時間複雜度的解的)
- Jeff Dean can beat you at connect four. In three moves.
Jeff在四子連珠的遊戲中能贏你,在三步內
- When your code has undefined behavior, you get a seg fault and corrupted data. When Jeff Dean's code has undefined behavior, a unicorn rides in on a rainbow and gives everybody free ice cream.
當你的代碼有不肯定行爲時,你一般獲得一個段錯誤或者不正確的數據。當Jeff的代碼有不肯定行爲時,孫悟空會駕着七彩雲朵給每一個人發免費的長壽仙桃
- When Jeff Dean fires up the profiler, loops unroll themselves in fear.
當Jeff觸發程序的程序性能採樣時,循環會因懼怕而自動展開。
- Jeff Dean is still waiting for mathematicians to discover the joke he hid in the digits of PI.
Jeff依然孤獨地等待着數學家們解開他在PI的數字中隱藏的笑話
- Jeff Dean's keyboard has two keys: 1 and 0.
Jeff的鍵盤多達兩個鍵:1和0
- When Jeff has trouble sleeping, he Mapreduces sheep.
當Jeff失眠時,他Mapreduce羊羣。(Mapreduce是Jeff的做品之一,這個分佈式處理的框架算法是Google立足的根本之一)
- When Jeff Dean listens to mp3s, he just cats them to /dev/dsp and does the decoding in his head.
當Jeff聽MP3時,他查看其中的二進制內容而後在他腦子裏進行音頻解碼。
- When Graham Bell invented the telephone, he saw a missed call from Jeff Dean.
當貝爺在沙漠中逮到一個手機時,他發現手機裏有個Jeff的未接來電。
當貝爾發明電話後,他發現電話裏有個Jeff的未接來電。
- Jeff Dean's watch displays seconds since January 1st, 1970. He is never late.
Jeff的手錶顯示的數字是自1970年1月1日0點0分0秒以來的秒數,他所以歷來不遲到。
- Jeff starts his programming sessions with 'cat > /dev/mem'.
Jeff在開始編程以前,會作'cat > /dev/mem'。(即把輸入的內容直接導到內存中)
- One day Jeff Dean grabbed his Etch-a-Sketch instead of his laptop on his way out the door. On his way back home to get his real laptop, he programmed the Etch-a-Sketch to play Tetris.
有一次Jeff出門時錯將草圖畫板當筆記本拿了。
結果在他回家取筆記本的路上,他對畫板進行了重編程以在其上玩俄羅斯方塊
- Google search went down for a few hours in 2002, and Jeff Dean started handling queries by hand. Search Quality doubled.
在2002年,Google搜索曾掛了幾個小時,因而Jeff站出來手動處理用戶的查詢請求。搜索準確度翻了番
- The x86-64 spec includes several undocumented instructions marked 'private use'. They are actually for Jeff Dean's use.
x86-64指令集中有一些沒有被記入到文檔的‘私用’指令。事實上,他們是給Jeff用的
27.mantri@mantri-laptop~$ rm -r /
rm: cannot remove root directory ‘/’mantri@mantri-laptop~$ su - jeffdean -c "rm -r /"
I am extremely sorry. Removing root directory..
不解釋
- Jeff Dean once shifted a bit so hard, it ended up on another computer.
有次Jeff移位移得太恨了,結果那一位跑到另外一臺計算機上去了
- Jeff Dean has gone to /dev/null and come back.
Jeff從/dev/null那涅槃了。(龐統啊~)
Jeff又從/dev/null那涅槃了。(擦!)
- Jeff Dean sorts his phone contacts by their vcard's md5 checksums.
Jeff通信錄的排序規則是按照聯繫人的md5值
- Jeff Dean doesn't kill processes, he slays them.
Jeff他不殺進程,他肢解虐殺它們
- The needle in haystack found Jeff Dean
海底的針會本身找上Jeff
- All of the Google App Engine is actually hosted from Jeff Dean's Nexus S
Google App Engine的服務器其實是Jeff的Nexus S
- Jeff Deans’s keyboard doesn’t have a Ctrl key because nothing controls Jeff Dean.
Jeff的鍵盤壓根就沒有Ctrl(控制)鍵,由於沒有什麼東西能控制Jeff
- You name three pointers, Einstein, Euler, and Turing, when you de-reference them, all you get is Jeff Dean.
若是你命名三個指針分別爲愛因斯坦、歐拉和圖靈,當你查看它們的指向時,你看到的都會是Jeff。
最後,關注公衆號Java技術棧,在後臺回覆:GG規範,能夠獲取一份 Google 代碼開發規範,很是齊全。
來源:www.zhihu.com/question/22081653/answer/20593104
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