instruments | 易学教程

How use Instruments and display the console in Command Lines applications

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问题 I'm using Xcode on OSX to develop command line C applications. I would also like to use Instruments to profile and find memory leaks. However, I couldn't find a way to display the console when launching the application from within Instruments. I'm also unable to attach to a running command line process (it exits with an error): Here's an example code: #include <stdio.h> #include <signal.h> #include <stdlib.h> #include <setjmp.h> static sigjmp_buf jmpbuf; void handler(int sig) { char c[BUFSIZ]

Using instruments tool to locate leaks

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来源： https://stackoverflow.com/questions/55376873/using-instruments-tool-to-locate-leaks

Using instruments tool to locate leaks

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来源： https://stackoverflow.com/questions/55376873/using-instruments-tool-to-locate-leaks

Using instruments tool to locate leaks

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来源： https://stackoverflow.com/questions/55376873/using-instruments-tool-to-locate-leaks

Using instruments tool to locate leaks

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来源： https://stackoverflow.com/questions/55376873/using-instruments-tool-to-locate-leaks

os_signpost works on simulator but not when running on device

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来源： https://stackoverflow.com/questions/53641394/os-signpost-works-on-simulator-but-not-when-running-on-device

iOS 使用Instruments优化内存性能

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iOS 使用Instruments优化内存性能问题项目中使用到图片合成视频，发现内存增长十分的迅速，导致一些因为内存引起的问题，本文使用这个案例，结合Instruments工具检测和分析问题，最终解决内存问题。本文的Demo代码 ScreenRecorderTest2 Instruments检测查看某个范围内的内存增长打开Instruments选择Allocations工具，点击录制按钮进行录制使用鼠标框选出内存增长的区域，图中两条黑线中的高亮区域上面图表区域是内存的可视化视图下面的面板区域显示的是具体的统计数据可以看到整体的内存增长为16.81M (All Heap Allocations 堆内存的分配) 堆内存分配的详细统计数据点击All Heap Allocations旁边的小箭头按钮可以看堆内存分配的详细统计数据： Address：数据的内存地址 Timestamp：数据创建的时间 Size：数据的大小 Responsible Library：数据创建的相关的库 Responsible Caller：数据创建的相关的库的函数调用统计数据表中可以看出AppleJPEG 库调用 applejpeg_decode_create 方法创建了很多的内存的数据   右边区域显示的是函数的调用栈信息面板（Stack Trace）

Many leaks showing in Instruments caused by Array and Dictionary

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问题 I was testing my app using Instruments checking for any leaks and to my surprise it's showing many leaks caused mainly by: _ContiguousArrayStorage<String> _ContiguousArrayStorage<Int> _ContiguousArrayStorage<NSLayoutConstraint> _NativeDictionaryStorageOwner<Int, CGFloat> _NativeDictionaryStorageOwner<String, AnyObject> The tests are done on an iPhone 5s, iPhone 6s and iPad Pro. All of the devices are running iOS 10. What can I do about these leaks? 来源： https://stackoverflow.com/questions

First Stage IV Regression Output in R

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问题 I want to report the results of both stages of my Two-Stage Least Square Regression but stargazer output only gives me the second stage. I have calculated a Two-Stage Least Square Regression with the ivreg command in R. This is what my code looks like: ivmodel1 <- ivreg(Y ~ X + W1 + W2 + W3 + W4 | W1 + W2 + W3 + W4 + Z, data = df) where Y = dependent variable (cont.); X = endogenous independent variable (dummy); W1-W4 = control variables; Z = exogenous instrument (dummy) Now I am having

Memory leak on presentModalViewController

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问题 I'm opening a camera for the user to take a picture. I keep getting a memory leak when I took a picture and pressed "use" on: [self presentModalViewController:imagePicker animated:YES], Full code: imagePicker = [[UIImagePickerController alloc] init]; imagePicker.delegate = self; imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; imagePicker.mediaTypes = [NSArray arrayWithObjects: (NSString *) kUTTypeImage, (NSString *) kUTTypeMovie, nil]; imagePicker.allowsEditing = NO; [self