runtime

I'm just curious, does Objective-C compile into C code or does the Objective-C runtime work like a layer of abstraction above the program? Sorry in advance if I don't know what I'm talking about! Compiling Objective-C into C doesn't make sense, because then it would need to parse the C code and compile it. Objective-C compiles into machine code . Remember that the language (Objective-C, C, C++) only defines the rules to correctly write code. The compiler checks to see if your code is correct and compiles it, i.e., translates it into executable code . Also, don't confuse Objective-C language,

I'm currently occupying myself with implementing a fluent interface for an existing technology, which would allow code similar to the following snippet: using (var directory = Open.Directory(@"path\to\some\directory")) { using (var file = Open.File("foobar.html").In(directory)) { // ... } } In order to implement such constructs, classes are needed that accumulate arguments and pass them on to other objects. For example, to implement the Open.File(...).In(...) construct, you would need two classes: // handles 'Open.XXX': public static class OpenPhrase { // handles 'Open.File(XXX)': public

I want to make some tuning for multithreaded program. If I know how much threads can really work in parallel I can make the program much more effective. Is there a way in Java to get this info? You can use Runtime.getRuntime().availableProcessors() But its more of a best guess and even mentioned by the API This value may change during a particular invocation of the virtual machine. Applications that are sensitive to the number of available processors should therefore occasionally poll this property and adjust their resource usage appropriately. One note about the availableProcessors() method,

I have a simple web app running on Tomcat 5.5 with log4j for logging. Occasionally I need to push the logging down to DEBUG but most of the time I'm happy with INFO. I can change my config xml and restart the app but I would prefer to switch the log levels on the fly. Is there a standard technique for this? Just use the programmatic API : logger.setLevel(Level.DEBUG) in your program when you need more verbose logging output, and logger.setLevel(Level.INFO) to make it less verbose again. I created a new java application module (jar) to do this in a web interface at runtime, and also have a page

I wrote a script that calls functions from QIIME to build a bunch of plots among other things. Everything runs fine to completion, but matplotlib always throws the following feedback for every plot it creates (super annoying): /usr/local/lib/python2.7/dist-packages/matplotlib/pyplot.py:412: RuntimeWarning: More than 20 figures have been opened. Figures created through the pyplot interface ( matplotlib.pyplot.figure ) are retained until explicitly closed and may consume too much memory. (To control this warning, see the rcParam figure.max_num_figures ). max_open_warning, RuntimeWarning) I found

错误提示: 解决办法 :项目右键 → properties → Targeted Runtimes → 选择本地配置的tomcat 来源： https://www.cnblogs.com/liujingche00/p/11811040.html

这是由于某个 Chrome 扩展程序造成的。 打开 chrome://extensions/，逐一关闭排查。我这边是由于“迅雷下载支持”这个扩展引起的，将其关闭即可。 来源： https://www.cnblogs.com/sea-stream/p/11810693.html

In python, which one is faster ? numpy.max(), numpy.min() or max(), min() My list/array length varies from 2 to 600. Which one should I use to save some run time ? Well from my timings it follows if you already have numpy array a you should use a.max (the source tells it's the same as np.max if a.max available). But if you have built-in list then most of the time takes converting it into np.ndarray => that's why max is better in your timings. In essense: if np.ndarray then a.max , if list and no need for all the machinery of np.ndarray then standard max . I was also interested in this and

目录 (?) [-] Go语言的并发和并行 goroutine是在并行吗 并行和并发 真正的并行 一个小问题 runtime调度器 总结 开启多核的实验 Go语言的并发和并行 不知道你有没有注意到一个现象，还是这段代码，如果我跑在两个goroutines里面的话: var quit chan int = make ( chan int ) func loop () { for i := 0 ; i < 10 ; i ++ { fmt . Printf ( "%d " , i ) } quit <- 0 } func main () { // 开两个goroutine跑函数loop, loop函数负责打印10个数 go loop () go loop () for i := 0 ; i < 2 ; i ++ { <- quit } } 我们观察下输出: 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 这是不是有什么问题？? 以前我们用线程去做类似任务的时候，系统的线程会抢占式地输出， 表现出来的是乱序地输出。而goroutine为什么是这样输出的呢？ goroutine是在并行吗？ 我们找个例子测试下: package main import "fmt" import "time" var quit chan int func foo ( id int