Signposts seems like a really promising new tool, especially when it comes to quickly getting more thorough information when debugging tricky performance problems and asynchronous operations. With this new, more granular information, this process should now be much easier than before. By selecting the Blank template and then adding the os_signpost instrument using the + button in the top right corner, we can now see our signposts being visualized for each file □.Īll that remains now is to dig into the data that Instruments is showing us, to identify what kinds of files that are problematic and what we'll need to change in our code to deal with those cases. With the above in place, we can now select Product > Profile in Xcode to launch Instruments and start profiling. Wrapping things upįinally, let's add the same signposts around our call to decode each file's data as well, giving us the following end result: import os.signpost Let's say our app at some point needs to load a set of records, and by spending some time with the Time Profiler in Instruments we suspect that the problem lies within our function that loads records, that looks like this: func loadRecords() throws -> s format to be able to pass in our file's path as an argument. When we discover a performance problem in an app that we're working on, the first thing we want to do is identify where the bottleneck that's causing the problem might be. In today's WWDC update, let's take a look at how to get started with this new tool! Bottlenecks Using this new tool, we can easily place markers - signposts - in our code that can make profiling and debugging performance issues a lot simpler. To address this problem, Apple is introducing a new developer tool this year called os_signpost. Many times performance drops are hard to reproduce and really require good information in order to be fixable. Something that can be even more challenging is debugging and identifying bottlenecks when it comes to performance. As the refresh rate of the screens we render on increases (up to 120 Hz on the iPad Pro), the amount of time we (and the system) has available to render each frame shrinks, and maintaining smooth scrolling and other per-frame rendering tasks becomes increasingly challenging. Like mentioned in several sessions during the conference, maintaining a solid level of performance is in many situations essential to providing a good user experience. One big focus of this year's WWDC is performance - both in terms of how Apple seems to have made a big effort in improving the overall performance of their operating systems and frameworks, but also in the messaging to us third party developers.
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