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想寫就寫的部落格把一些工作上的心得以及生活點滴做一些紀錄
http://hawkhsieh.blogspot.com/
把一些工作上的心得以及生活點滴做一些紀錄
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想寫就寫的部落格 | hawkhsieh.blogspot.com Reviews
https://hawkhsieh.blogspot.com
把一些工作上的心得以及生活點滴做一些紀錄
hawkhsieh.blogspot.com
想寫就寫的部落格: 七月 2014
http://hawkhsieh.blogspot.com/2014_07_01_archive.html
我以為使用俱有gc的語言，就可以為所欲為的配置記憶體（反正有gc在後面擦屁股）。但是從Ｃ寫系統程式上來的經驗告訴我：真的有這麼好嗎？雖然抱持著懷疑，但還是先下手寫點code吧。 於是我開始寫go，不疑有他、放心的make([]byte,hugeSize)，直到最近的案子中，需要模擬5萬條長連線到一臺測試機器。只送出了幾千個連線請求後，就被OOM Killer 關心了。code大概是這樣：. BigArray := make([]byte, 1024*1024*10). Debug 之後讓我發現不要在一個for迴圈裏面make，尤其是我的測試需要跑5萬個迴圈，雖然每次回圈的make只用來讀取一次，但是gc並不會“瞬間”就把剛剛沒用到的記憶體清掉。因此，要善用每一次的make，盡可能地重複使用它。 BigArray := make([]byte, 1024*1024*10). 另外，參考 io.Copy() 裡面的實作方式，是在回圈之外先make一個小塊的記憶體，再用回圈的方式去將資料全部複製。 Buf := make([]byte, 32*1024). Nr, er := src.Read(buf).
想寫就寫的部落格: 讀取 http Body 而不會造成 proxy error: http: ContentLength=xx with Body length 0
http://hawkhsieh.blogspot.com/2016/04/http-body-proxy-error-http.html
讀取 http Body 而不會造成 proxy error: http: ContentLength=xx with Body length 0. 如果想要看http request內容，看完以後再決定要不要代理到後端服務。要開一個 Proxy 的方法如下：. Req *http.Request) { req = r req.URL.Scheme = "http". ReqURL.Host = "localhost:2379". Proxy := &httputil.ReverseProxy{Director: director} proxy.ServeHTTP(w, r). 在Proxy之前，如果要讀取request body，需要使用ReadAll來把Body讀出來，像這樣子. ReadAll返回了資料以後，Body的索引也都會改變。這時去呼叫Proxy的程序則會產生這樣的錯誤: http: proxy error: http: ContentLength=153 with Body length 0. B := bytes.NewBuffer(make([]byte, 0.
想寫就寫的部落格: 四月 2016
http://hawkhsieh.blogspot.com/2016_04_01_archive.html
讀取 http Body 而不會造成 proxy error: http: ContentLength=xx with Body length 0. 如果想要看http request內容，看完以後再決定要不要代理到後端服務。要開一個 Proxy 的方法如下：. Req *http.Request) { req = r req.URL.Scheme = "http". ReqURL.Host = "localhost:2379". Proxy := &httputil.ReverseProxy{Director: director} proxy.ServeHTTP(w, r). 在Proxy之前，如果要讀取request body，需要使用ReadAll來把Body讀出來，像這樣子. ReadAll返回了資料以後，Body的索引也都會改變。這時去呼叫Proxy的程序則會產生這樣的錯誤: http: proxy error: http: ContentLength=153 with Body length 0. B := bytes.NewBuffer(make([]byte, 0.
想寫就寫的部落格: Use context to cancel a function
http://hawkhsieh.blogspot.com/2016/06/use-context-to-cancel-function.html
Use context to cancel a function. 我曾經使用到一個函數，是要帶入 context.Background。然後這個函數就等在裡面了，直到有回應才回傳結果出來。最近要將這個函數強制的跳出，一時間還不知道該怎麼做。苦惱之際看到了這個函數帶入了 context.Background()，於是就從context這個庫去爬文。於是先找到了. 裡面重點的說明了原文裡面 context 的原理與使用方法。原文在這兒：. Https:/ godoc.org/golang.org/x/net/context. Http:/ blog.golang.org/context. 前情提要講完了，現在直些貼程式碼該怎麼強制跳出一個帶入了context.Background的函數呢？ Err = aBlockedFunction(context.Background(). Ctx,cancel := context.WithCancel( context.Background() )然後放進去. 訂閱： 張貼留言 (Atom). Use context to cancel a function.
想寫就寫的部落格: 七月 2011
http://hawkhsieh.blogspot.com/2011_07_01_archive.html
軟體、韌體傻傻分不清，這個討論我相信已經討論1x年了，小弟不才，也許更久。相信時代變遷得如此快速，1x多年的老前輩應該有深深的感觸吧。但如果想知道實際上的分別，還是到wiki上詳細閱讀吧。 我想分享的是：寫韌體，就不需要懂軟體嗎？ 韌體要coding，軟體要coding。只要是一群人合作一起coding，不管他是coding來控制硬體，還是coding來UI的，還是coding來網頁的，甚至是用嘴巴coding的，都一定會遭遇到一些問題：. Debug，而且具有非常不平衡的性質。就是可能改錯1個字，或是一行，都有可能造成嚴重錯誤。 不可預測性，常常計畫趕不上老闆一句話，韌體有時也是會牽連修改。只要修改，就可能有bug。 這些問題，如果不知道方法處理的team，就是以吵架收場。不知道該怎麼去處理，一而再再而三的prj延宕，讓老闆失去耐心後，你不解決問題，就是等著被老闆解決。 這些問題只是軟體開發的冰山一角，韌體開發的coding，還可以再寫一堆落落長的注意事項.。看，不可否認，即使你原本是韌體工程師，可能只寫dri...標籤： 嵌入式系統(embedded system). 當一個很大包的程式(之後稱&#...
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Boys & Girls Clubs of Hawk-Houston - Home
Programs and Activities Photo Gallery. July 29, 1 - 4 - Sarrell Dental Center will conduct a free dental screening ages 4-20. Parental consent required. Welcome To Boys and Girls Clubs Of Hawk-Houston. IT'S SUMMER AT HAWK-HOUSTON - LEARNING IS FUN. IT'S SUMMER AT HAWK-HOUSTON - LEARNING IS FUN. IT'S SUMMER AT HAWK-HOUSTON - LEARNING IS FUN. Support the 2015 Summer SM(ARTS) fundraising campaign. Great Futures Start Here. Phone: (334) 792 4618. Email:. Programs and Activities Photo Gallery.
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HawkHQ (Real Names Are Far Too Formal..) - DeviantArt
Window.devicePixelRatio*screen.width 'x' window.devicePixelRatio*screen.height) :(screen.width 'x' screen.height) " class="mi". Window.devicePixelRatio*screen.width 'x' window.devicePixelRatio*screen.height) :(screen.width 'x' screen.height) ". Join DeviantArt for FREE. Forgot Password or Username? Digital Art / Hobbyist. Real Names Are Far Too Formal. Deviant for 1 Year. Real Names Are Far Too Formal. April 1, 1993. Last Visit: 17 hours ago. This deviant's activity is hidden. Deviant since Mar 18, 2014.
想寫就寫的部落格
Golang是用同樣的記憶體來存放 for range 取得的變數. 在切片裡面走訪的時候，利用range所取出的變數，在記憶體中是同一個位置。不能利用此位置來區別切片裡的內容。例如：. Cars := []string{"toyota","honda","bmw"}. For idx,car := range cars{. FmtPrintf("car at:%p n", &car). FmtPrintf("cars[%d] at:%p n", idx,&cars[idx]). Https:/ play.golang.org/p/JuH5WdOw7q. Car at:0x1040a120 cars[0] at:0x10432200 car at:0x1040a120 cars[1] at:0x10432208 car at:0x1040a120 cars[2] at:0x10432210. 因此不能利用car這個變數的位置來作為後續使用，而是要直接用idx索引 cars。 Use context to cancel a function. Reader := io.TeeReader(r...
Homepage
The Eighth Annual Hawk Hundred. Is a 100-mile, 50-mile and Marathon Trail race put on by the Lawrence Trail Hawks. This year’s race takes place on Saturday, September 8th through Sunday September 9th in Lawrence, Kansas. The course covers four loops through the rolling hills of Clinton State Park. The Hawk races are part of the 2018 Trail Runner Trophy Series! 2018 Sponsors include: Orange Mud, Tailwind Nutrition, Second Best Coffee, and Honey Stinger! Lands End: 4.5 miles no crew access, drop bags.
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