Using Time Profiler in Instruments

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Depending on the selected configuration, it displays the stack depth at each sample time. In my case, you know, sometimes users have tens of thousands or hundreds of thousands or a hundred thousand photos in their photos collection.

Performance Fixes So now has come the time to fix our performance issues. And then let's zoom out so we can see the data coming in. We are also focused on developing a strong community.

CIARAN MCCORMACK

Part of this series, you can now, what is Instruments, how it works, how can you launch it and what type of analysis can you make with that, how can you use the Navigate Timeline Pane and Detail Pane, how can you hide system libraries, add flags to your Timeline at serious points, or add new Instrument to it, or check the source code in Xcode, which causes problems. These are usually code bugs, not allocations but it can be several type of mistakes, and you have to find a better code or solution, or sometimes you use unnecessary code. It can help you check your project, and not just find problems, because you can test it with your updated code again, and see if the problem is still exist. Look for unbalanced core usage. If a single core has areas of heavy usage while other cores remain quiet, that can indicate areas that need greater optimization. When zoomed out, activity may appear to be occurring on multiple threads, but a closer inspection may reveal otherwise. Therefore, be sure to zoom in on the track pane when examining core usage. Whenever possible, work should be moved off the main thread. Record a Trace Please see the Video, it's better to see the process and not just screenshots. At first step you need to recording what you are actually doing with your application in your Simulator or on your Device. For the best results, it's better to use on your device that will be real data. In Xcode long press the play button and select Profile instead of Running or check the first tutorials for more option to launch Instruments. Click on the Red button, do your staff in your app. Try to check at first just one action, and repeat it 2-3 times. After that, you can stop the recording, and see the results. If there are some problems with your code, you will see at your trace some significant high results. And if you've repeated the same action, you can see the same high values at every time, when you are doing the same action. I use for this tutorial my earlier Core Data iCloud Sync tutorial Xcode Project. Hide System Library and Check the problems in your code blocks You can Hide System Libraries, and with that you can reach your code in the list. If you select a period of your Trace, you will see just that part of codes in the list. Click one of your code in the list - I'm click on textFieldDidBeginEditing. Here you can see the same code with black. This is your code, you can click on it. And You can find which row or rows of your code needs more time, and cause high signs at the trace. Detect the exact row of the problem Sometimes Instruments shows you the problem some rows under the exact problematic code. So I check them in Xcode Clicking on Xcode icon in Instrumentsand I'm trying to xcode profiler tutorial another code, or just delete it, if it mustn't have. At Instruments you can see the data at the timeline pane. At Extended Detail, you can see which part of your code detected. You can click on it to see your source code details. However, better first select a Range. Update the code and test it again I'm deleting the reloudInputView code in the video, and I'm running again the Time Profiler. After repeating the user actions again, I'm searching for the same block of code in the list. That means, that was the problem. Sometimes you need to delete that part of code, sometimes you can detect the problem with this way, and you need to find another better way to write that code. I'm doing something like that with the next block, the ViewDidLoad method. Here the problem appears at xcode profiler tutorial again, but I'm sure, that the Appdelegate cause the problem. And yes, if I open the project in Xcode, there is a warning there. So I try another method not the final solution, just I did something for the video tutorial. After that I test it again, and there xcode profiler tutorial more problem with ViewDidLoad block in Instruments. So with that steps, you can check your whole project. This is the fastest and easiest way to find, if something isn't the best in your Xcode project. But if you want to check a specific type of bug allocation, or high energy or core graphics. I'll show them in this tutorial series. You can also test with Activity Monitor, or System Trace profiler. If you test with these in Simulator, you will find in your Instruments your other system process too, for example Skype, or Postgres processes too. Check Footer section xcode profiler tutorial these opportunities. I want Memory allocations and Memory leaks and how to do with profile and instruments, so can you share about this. I hope you understand my point. Posted by Sivaram, almost 2 years ago Hi Sivaram, my new tutorial is available with Blender test, which is exactly memory test too, because you have to do those steps to decrease memory at images and misaligned pixels, stretched contents. The video is in upload process. Posted by spotlessicode, over 1 year ago Make a Comment.

Demystifying The Xcode Interface You can also check here for the full. However, better first select a Range. This will build your application, and a new window will pop-up for the selection of the profiling template see figure below. Get ready to dive into the fascinating world of Instruments! Click on the bar at the top of this area on the word Profile and select Samples. Thank you, and have a good afternoon. But since they're showing up, I know that generally they're being called a lot. The general overview here is that you want to be profiling as close as you can to what your customers will be running. There's no reason for me to do face detection on the main thread. Looks like you have a strong reference cycle! This is where all the coding happens.