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，主要作品有《MapReduce》等。
主要成就：
- MapReduce 一個大規模數據處理系統
- BigTable 一個結構化數據的分佈式存儲系統
- Spanner 一個全球性的數據庫系統
- 參與谷歌的網絡爬蟲、索引、查詢系統、AdSense、谷歌翻譯的設計與實現。
- 2009年當選美國工程院院士
- TensorFlow 人工智能學習系統 項目負責人
Jeffrey Dean，簡單來說，這貨是Google牛逼的源泉之一。因爲此人實在太牛了，於是出現了關於他有多牛的幾個笑話，直接笑翻，和大家共享下。
- 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被問及如果P=NP意味着什麼。他說，“P=0 或者 N=1”。然後，在所有的面試官還沒笑完之前，Jeff瞄了一眼Google的公共證書然後在白板上寫上了對應的私鑰。
- Compilers don’t warn Jeff Dean. Jeff Dean warns compilers.
編譯器從來不給Jeff編譯警告，而是Jeff警告編譯器
- 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碼代碼的速度突然激增了40倍，原因是他把自己的鍵盤升級到了USB 2.0
- Jeff Dean builds his code before committing it, but only to check for compiler and linker bugs.
Jeff還是會在提交代碼前把它們編譯一遍，不過這麼做的目的只是爲了檢查下編譯器和鏈接器有沒有bug
- All pointers point to Jeff Dean.
所有指針都是指向Jeff的
- 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
- 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
- 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，然後他花了整整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通常被設計爲從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從來不會有衝突，原因是本來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滿足，於是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，原因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。寫源代碼只是爲了作爲文檔使用。
- 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.
當你的代碼有不確定行爲時，你通常得到一個段錯誤或者不正確的數據。當Jeff的代碼有不確定行爲時，孫悟空會駕着七彩雲朵給每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，循環會因害怕而自動展開。
- 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的作品之一，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然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，他因此從來不遲到。
- Jeff starts his programming sessions with 'cat > /dev/mem'.
Jeff在開始編程之前，會做'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，於是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通訊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
海底的針會自己找上Jeff
- All of the Google App Engine is actually hosted from Jeff Dean's Nexus S
Google App Engine的服務器實際上是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，因爲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.
如果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，可以獲取一份 Google 代碼開發規範，非常齊全。
來源：www.zhihu.com/question/22081653/answer/20593104
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