instruments | 易学教程

How to profile memory usage & performance with Instruments?

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Of all the Instruments Trace Templates, I love using: Zombies to detect where an object is getting over-released, great for debugging EXEC_BAD_ACCESS errors. Leaks to detect memory leaks. Core Animation w Color Blended Layers to detect frame rate & translucent subviews, great for smoothing up UITableView scrolling. I always hear people saying to profile my app's memory usage & performance. Why should I profile memory usage & performance? My app runs fine. How do I do it? I've used Allocations and see that my iPhone app starts at 1 MB total allocated memory and grows to 5 MB after normal usage.

Instruments in Xcode 4

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问题 I was trying to open instruments in xcode 4 but was not able to find a way to do it. Usually in Xcode 3, we would do run -> run with performance tool... but I dont really find any such thing to do it in xcode 4.. would anyone be able to tell me how to do this? 回答1: If you want to use Instruments with your product: Product -> Profile This brings up a dialog where you can choose Leaks, Allocations, etc. 回答2: Cmd-I also works to invoke Profile. By default Profile is set up to use the Release

Live Bytes vs Real Memory in Activity Monitor on iOS

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问题 I'm working on an iOS app that will create a lot of small objects and floats, and trying to get an idea for how much memory usage it's consuming. When I run the "Allocations" instrument, it says I have about 2MB of "Live Bytes", and the figure stays roughly constant as I move through the app (spikes up to 3MB or so when the App is busy, but then drops back down to 2MB). But when I run the "Activity Monitory" instrument, my app's "Real Memory" is 25MB once it finishes launching, and grows

Trying to read a Xcode Instruments .trace file. What is the file format of a .trace file?

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I am writing an automated profiling system, to profile different GPU intensive screens in my App. I have been trying to use 'XCode Instruments' for this, with the 'OpenGL ES Driver' instrument that captures the gpu usage data. My automated system runs Xcode Instruments from the command line which runs the App, profiles and captures the data, and writes the data to a ".trace" file. I now want to be able to open the trace file, and read the trace data using my automated profiling system, so that I can inform App developers of how the various parts of the App perform. I cannot however find any

XCode Instruments Allocations: Look at Live Bytes or Overall Bytes?

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问题 I am getting some memory warning in my iOS app so I am running Instruments to see the allocations. Should I look at the * All Allocations * Live Bytes or Overall Bytes? Someone said the iOS can close my app if I use for 22MB, is that from the Live or Overall bytes section? 回答1: Live Bytes is the current usage and is what you are interested in, overall bytes includes all released allocation. The other thing is to look at the graph and look for peaks. As an example I saw a huge peak of about

Missing symbol names when profiling IPhone application with Instruments

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I am compiling an IPhone application via command line (so no XCode options involved) and I am unable to get my symbol names to show when profiling with Instruments. I have tried several flags such as -gdawrf-2 and -g without any success. I have also tried using dsymutils to generate a .dSYM file but i have no clue how I'm supposed to use it so that failed aswell. Any help will be greatly appreciated! I Changed my project settings to not include the dSYM file while building: Changing it to include the dSYM File helped the profiler desymbolize the symbols and fixed my issue: I was still having

How to run iPhone program with Zombies instrument?

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问题 I'm running XCode 3.2 on Snow Leopard and I'm trying to run the Zombies instrument against my app but the selection is grayed out and I don't know why. I know about the NSZombieEnabled environment variable. I have that set to YES on my application. I'm not sure if this matters, but, the app is an app that I started developing on Leopard with the previous version of XCode. Here is a screenshot of what my menu looks like: 回答1: You need to launch the Instruments application with the Zombies

Enable and Debug Zombie objects in iOS using Xcode 5.1.1

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问题 I have an iOS(7.1) app which crashes due to EXC_BAD_ACCESS . If I am not wrong, this happens due to the use of an object which is already de-allocated. After a bit of searching, I found out that enabling Zombie objects help to pin point the line of error. As I am using xcode 5.1.1, I have done the following to Enable Zombie Objects . And then, checking the Enable Zombie Objects checkbox, Then I went to Instruments panel, selected Zombies ,clicked Profile and got this, Now the simulator (in

Is there a way to remove the authorization prompt from command-line instances of Instruments (XCode)?

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问题 I am currently using Instruments via a bash script to initiate the command-line interface to start up runs of the Automation plug-in. With 4.2, this worked well enough, however with the upgrade to Xcode 4.3, I am now being prompted for an authorized user to 'analyze other processes'. No user is ever actually authenticated, even if the correct credentials are granted. I get the following error: Failed to authorize rights (0x20) with status: -60007. 2012-02-27 19:30:37.232 instruments[54151

Can the UI Automation instrument be run from the command line?

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Is there a way to open the UIAutomation instrument through the terminal? Will it be possible to write an AppleScript to open Apple's UIAutomation tool and load the application to be tested? Can you please tell me is there any way through scripting or through the command line we can open UIAutomation and select the app to be tested, as well as select the test script? Farhan Ahmed Wasim instruments -t /Developer/Platforms/iPhoneOS.platform/Developer/Library/Instruments/\ PlugIns/AutomationInstrument.bundle/Contents/Resources/Automation.tracetemplate \ <full_path_to_application> -e UIASCRIPT