optimization

问题 func grabPage(i int, wg *sync.WaitGroup, buf *[]byte) { defer wg.Done() res, err := http.Get("https://en.wikipedia.org/wiki/Immanuel_Kant") if err != nil { log.Fatal(err) } f, err := os.Create(fmt.Sprintf("./data/%d.txt", i)) if err != nil { log.Fatal(err) } _, err = io.CopyBuffer(f, res.Body, *buf) if err != nil { log.Fatal(err) } } func main() { f, _ := os.Create("cpuprofile") pprof.StartCPUProfile(f) defer pprof.StopCPUProfile() runtime.GOMAXPROCS(4) start := time.Now() var wg sync

问题 First time here so forgive me for any faux pas. I have a question about the limitation of SQL as I am new to the code, and what I need I believe to be rather complex. Is it possible to automate finding the optimal data for a specific query. For example, say I have the following columns: 1) Vehicle type (Text) e.g. car,bike,bus 2) Number of passengers (Numeric) e.g. 0-7 3) Was in an accident (Boolean) e.g. t or f From here, I would like to get percentages. So if I were to select only cars with

问题 I have an on-the-fly thumbnailing system and am trying to find the best way to make sure it's as fast as possible when serving up images. Here is the current flow: User requests thumbnail thumbnails/this-is-the-image-name.gif?w=200&h=100&c=true htaccess file uses modrewrite to send requests from this folder to a PHP file PHP file checks file_exists() for the requested image based on the query string values If it does: header('content-type: image/jpeg'); echo file_get_contents($file_check_path

问题 when i run solr/admin page i got this information, it shows optimize=true, but i have not set optimize=true in configuration file than how it is optimizing the indexes. and how can i set it to false then . Schema Information Unique Key: UID_PK Default Search Field: text numDocs: 2881 maxDoc: 2881 numTerms: 41960 version: 1309429290159 optimized: true current: true hasDeletions: false directory: org.apache.lucene.store.SimpleFSDirectory:org.apache.lucene.store.SimpleFSDirectory@ C:\apache-solr

问题 I was wondering which piece of code is going to run faster since I want to optimize as much as possible. code A: if(((a & 0x0FFF) + (b & 0x0FFF)) & 0x1000 != 0) { Register.setHCarryFlag(true); } else { Register.setHCarryFlag(false); } code B: Register.setHCarryFlag(((a & 0x0FFF) + (b & 0x0FFF))& 0x1000 != 0); The reason I ask is I suspect that code B doesn't branch, but I don't know for sure how each is converted to machine code. Better yet, is there a way to see the machine code that is

问题 My program makes an intensive use of small sub-images extracted using bilinear interpolation from larger grayscale images. I am using the following function for this purpose: bool extract_patch_bilin(const cv::Point2f &patch_ctr, const cv::Mat_<uchar> &img, cv::Mat_<uchar> &patch) { const int hsize = patch.rows/2; // ... // Precondition checks: patch is a preallocated square matrix and both patch and image have continuous buffers // ... int floorx=(int)floor(patch_ctr.x)-hsize, floory=(int

问题 Lets say I create a theano function, how do I run operations in parallel elementwise on theano tensors like on matrices? # This is in theano function. Instead of for loop, I'd like to run this in parallel c = np.asarray(shape=(2,200)) for n in range(0,20): # some example in looping this is arbitrary and doesn't matter c[0][n] = n % 20 c[1][n] = n / 20 # in cuda, we normally use an if statement # if (threadIdx.x === some_index) { c[0][n] = some_value; } The question should be reformed, how do

问题 This answer to this question works only for situations in which the desired solution to the coupled functions is not restricted to a certain range. But what if, for example, we wanted a solution such that 0 < x < 10 and 0 < y < 10 ? Another way of thinking about this is, what if the coupled functions are undefined when x or y is, e.g., less than zero? There are functions within scipy.optimize that find roots to a function within a given interval (e.g., brentq), but these work only for

问题 I am developing a website exclusively for mobile browsers. What guidelines should I follow to optimize the site for mobile development? My main concerns: Most mobile devices have propriety browsers. How can the app be tested on those different browsers (testing on an actual device is not possible due to security restrictions)? How to optimize the site for different screen sizes? How to make the app touch friendly? How to detect orientation of devices (in devices that come with an

问题 My CUDA application has constant memory of less than 8KB. Since it will all be cached, do I need to worry about every thread accessing the same address for optimization? If yes, how do I assure all threads are accessing the same address at the same time? 回答1: Since it will all be cached, do I need to worry about every thread accessing the same address for optimization? Yes. The cache itself can only serve up one 32-bit word per cycle. If yes, how do I assure all threads are accessing the same