lobisac.blogg.se - Signpost company article

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Os_signpost_event_emit(pointsOfInterestLog, operationIdentifier, "Start work") Os_signpost_id_t operationIdentifier = os_signpost_id_generate(networkLog) Os_log_t networkLog = os_log_create("-app", "NetworkOperations") Os_log_t pointsOfInterestLog = os_log_create("-app", OS_LOG_CATEGORY_POINTS_OF_INTEREST)

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Such information will help to understand what exactly happens in the investigated stage of code execution.

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For example, the size of the images downloaded or the number of the generated PDF page. Optionally, you can add additional data (metadata) to dispatched events.If the code can be executed asynchronously, then add a Signpost ID, which will allow you to separate the intervals of the same type of operations with different objects.end type at the beginning and at the end of the stage under investigation. For interval events, call the os_signpost function with the.It is worth considering that there are several types of events: for interval events (for example, a network request), you can use an arbitrary category, and for simultaneous events (for example, clicking a button), the predefined category pointsOfInterest / OS_LOG_CATEGORY_POINTS_OF_INTEREST. Os_signpost(.end, log: networkLog, name: "Overall work") Os_signpost(.end, log: networkLog, name: "Element work") Os_signpost(.begin, log: networkLog, name: "Element work") Os_signpost(.begin, log: networkLog, name: "Overall work") Os_signpost(.event, log: pointsOfInterestLog, name: "Start work") Let networkLog = OSLog(subsystem: "-app", category: "NetworkOperations") Let pointsOfInterestLog = OSLog(subsystem: "-app", category. The markup in the code will look like this: Suppose we are faced with the task of analyzing an asynchronous network request. We decided to split and log the stages of document generation, starting from the user clicking the «Generate» button and ending with the display of the document on the screen. To verify the correctness of processing the described cases, we suggest using os_signpost to profile the application processes and then analyze the data obtained.Īt the top level, the process of creating a PDF consists of three steps: The more often and more accurately we request the user's location, the more the device’s battery is spent. Duplication of requests and / or lack of cancellation of unnecessary requests additionally leads to inefficient use of the CPU. This also leads to a battery-life decreasing. For the user, this looks like crash, with no backtraces in the crash report.

If the memory warning is ignored, and the allocation of memory continues, the system forcibly terminates the application process. This process implicitly affects the CPU and battery of the device.

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When there is too little free RAM, iOS starts looking for memory to free up, simultaneously sending a memory warning to all running applications.

The specifications for the phones on the Apple website do not provide information on RAM, but other sources provide the following memory allocation for phone models:

Resource-intensive processes in the background thread can affect the responsiveness of the UI, increase battery consumption and force the application to terminate the system (in case of prolonged CPU overheating).

In this case, the system will set a crash report, the distinguishing feature of which will be an exception type - EXC_CRASH (SIGKILL), type 0x8badf00d.

At the start of the application, after 20 seconds of waiting, the system will shut down the application, and the user will not even see the app's first screen.

Suboptimal algorithm can lead to a long CPU load If your application performs its tasks and does not crash, it doesn’t mean that it works efficiently and correctly.īelow we describe the cases that you may potentially encounter. There are lot of applications on the user's mobile device, and all of them use common system resources, such as: CPU, RAM, network, battery, etc. To learn more about os_signpost application technology, see where it can help you and how it has already helped us, go further forward. Using it we increased he document’s displaying speed several times. But we wanted to make sure the effectiveness of the technical nuances of the decision. In one of the sprints, we were tasked with implementing the generation of a pdf-document on the client-side. Now let’s look through a new tools for debugging and profiling which were introduced by Apple in iOS 12 - the framework os_log and instrument for performance analysis os_signpost.

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In our previous article, we discussed the reasons of unit-tests’ instability and how to make them stable.