{"id":10440,"date":"2024-10-21T13:11:34","date_gmt":"2024-10-21T13:11:34","guid":{"rendered":"http:\/\/localhost\/hashstudioz\/?p=10440"},"modified":"2025-09-04T15:21:40","modified_gmt":"2025-09-04T09:51:40","slug":"from-concurrency-to-parallelism-enhancing-ios-app-performance","status":"publish","type":"post","link":"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/","title":{"rendered":"From Concurrency to Parallelism: Enhancing iOS App Performance"},"content":{"rendered":"\n<p>Did you know that over <strong>70% of applications today utilize concurrent programming techniques<\/strong> to enhance performance? In a world where <strong>a single server can handle thousands of concurrent connections<\/strong>, understanding the nuances of concurrency and parallelism is crucial for iOS App Performance Optimization. Surprisingly, <strong>most developers don\u2019t differentiate between the two concepts<\/strong>, leading to inefficiencies in code execution.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Concurrency\" >Concurrency<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Parallelism\" >Parallelism&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Concurrency_in_iOS\" >Concurrency in iOS<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Manual_Thread_Attribution\" >Manual Thread Attribution&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Create_Custom_Thread\" >Create Custom Thread<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Grand_Central_Dispatch\" >Grand Central Dispatch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Synchronous_vs_Asynchronous\" >Synchronous vs Asynchronous<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Serial_Queue_VS_Concurrent_Queue\" >Serial Queue VS Concurrent Queue<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#SerialConcurrent_vs_SyncAsync\" >Serial\/Concurrent vs Sync\/Async<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Types_of_dispatch_Queues\" >Types of dispatch Queues<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Main_Queue\" >Main Queue:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Global_Concurrent_Thread\" >Global Concurrent Thread<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Dispatch_Group\" >Dispatch Group<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Dispatch_WorkItem\" >Dispatch WorkItem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Dispatch_Barrier\" >Dispatch Barrier<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Dispatch_Semaphore\" >Dispatch Semaphore<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Dispatch_Semaphore_Benefits\" >Dispatch Semaphore Benefits<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#1_Flexible_Resource_Management\" >1. Flexible Resource Management<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#2_Granular_Control\" >2. Granular Control<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#3_Blocking_and_Signaling\" >3. Blocking and Signaling<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#4_Versatility\" >4. Versatility<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#5_Reduced_Overhead\" >5. Reduced Overhead<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#Key_Differences_Between_Concurrency_and_Parallelism_in_Ios_Development\" >Key Differences Between Concurrency and Parallelism in Ios Development:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#How_HashStudioz_Improves_iOS_App_Performance_Through_Effective_Use_of_Concurrency_and_Parallelism\" >How HashStudioz Improves iOS App Performance Through Effective Use of Concurrency and Parallelism<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#1_Thorough_Performance_Audits\" >1. Thorough Performance Audits<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#2_Customized_Optimization_Strategies\" >2. Customized Optimization Strategies<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#3_Hands-On_Training_and_Workshops\" >3. Hands-On Training and Workshops<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#4_Code_Samples_and_Best_Practices\" >4. Code Samples and Best Practices<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#5_Expert_Consultation\" >5. Expert Consultation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#6_Community_Engagement\" >6. Community Engagement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.hashstudioz.com\/blog\/from-concurrency-to-parallelism-enhancing-ios-app-performance\/#7_Continuous_Learning_and_Updates\" >7. Continuous Learning and Updates<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Concurrency\"><\/span><strong>Concurrency<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Concurrency is the execution of the multiple instruction sequences at the same time because that is how the work is done using the instruction sequences so when multiple instructions are taking place are being executed at same time concurrency is happening.<br>For example: if we have two tasks here Task 1 and Task 2 and both of them are done at the same time but or at least it is appearing that both of them are taking place at the same time we can say that tasks are being executed concurrently or the phenomenon is concurrency.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"220\" height=\"179\" src=\"https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Concurrency.gif\" alt=\"\" class=\"wp-image-10441\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Parallelism\"><\/span><strong>Parallelism&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Now, comes to the point what is parallelism because in concurrency too it is appearing that two tasks are taking place at the same time so what\u2019s the difference with parallelism.<\/p>\n\n\n\n<p>In parallelism, the dictionary says the literal meaning of parallelism is that the state of being parallel or of corresponding in some way. To understand this in a better way let\u2019s have a look at this super mom it is not just appearing that she is doing six jobs at the same time but they are actually taking place at the same time.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"220\" height=\"167\" src=\"https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/parallelism.gif\" alt=\"\" class=\"wp-image-10442\"\/><\/figure>\n\n\n\n<p>The difference with concurrency was that it was appearing that the telephone operator is responding to the two calls at the same time but actually he was answering one call at a time so in parallelism multiple processing elements are used simultaneously for solving any problem basically It involves multiple resources more than one resource we can say that the problems are broken down in the instructions and the instructions are executed simultaneously at the same time using multiple resources so more resources are involved in parallelism.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1060\" height=\"827\" src=\"https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-1060x827.png\" alt=\"concurrency vs parallelism\" class=\"wp-image-10465\" srcset=\"https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-1060x827.png 1060w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-300x234.png 300w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-768x599.png 768w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-1536x1199.png 1536w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-2048x1598.png 2048w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-1024x799.png 1024w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-1320x1030.png 1320w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-24x19.png 24w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-36x28.png 36w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-48x37.png 48w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-600x468.png 600w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_1-150x117.png 150w\" sizes=\"(max-width: 1060px) 100vw, 1060px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Concurrency_in_iOS\"><\/span><strong>Concurrency in iOS<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Achieving multithreading by creating threads manually<\/li>\n\n\n\n<li>Grand Central Dispatch<\/li>\n\n\n\n<li>Operation Queue<\/li>\n\n\n\n<li>Modern Concurrency in Swift<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Manual_Thread_Attribution\"><\/span><strong>Manual Thread Attribution&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>It is not the recommended way and we will discuss the cons ahead but in the Pro section we can say that it is the very raw approach of creating the threads of achieving the multi threading and it gives us more control more customisation we can start the thread cancel the thread change this text size basically we are dealing with a very raw API directly with the threads there\u2019s no abstract layer above the thread we are directly in contact of the thread and then the entire control is within the developer\u2019s hand so these are benefit bits of directly dealing with the threads.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Create_Custom_Thread\"><\/span><strong>Create Custom Thread<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>class CustomThread {\n    func createThread() {\n             let thread: Thread = Thread(target: self, selector: #selector(threadSelector),\nobject: nil)\n              thread.start()\n        }\n@objc func threadSelector() {\n       print(\u201cCustom thread in action\u201d)\n    }\n}\nlet customThread = CustomThread()\ncustomThread.createThread()<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Grand_Central_Dispatch\"><\/span><strong>Grand Central Dispatch<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It is commonly referred as dispatch.<\/li>\n\n\n\n<li>GCD is a queue based API that allows to execute closures on workers pools in the First-in First out order.<\/li>\n\n\n\n<li>We can submit the tasks those tasks are submitted in a queue and then GCD is basically an API. it is something which takes care of that queue and our submitted tasks are processed in FIFO Order.<\/li>\n\n\n\n<li>GCD Decides which thread is used to execute a task is handled by Grand central Dispatch, not the developer and execute them on an appropriate dispatch queue<\/li>\n<\/ul>\n\n\n\n<p>A dispatch Queue executes tasks either serially or concurrently but always in FIFO Order.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1060\" height=\"737\" src=\"https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-1060x737.png\" alt=\"Dispatch Queue\" class=\"wp-image-10462\" srcset=\"https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-1060x737.png 1060w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-300x208.png 300w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-768x534.png 768w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-1536x1067.png 1536w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-2048x1423.png 2048w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-1024x712.png 1024w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-1320x917.png 1320w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-24x17.png 24w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-36x25.png 36w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-48x33.png 48w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-600x417.png 600w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_3-150x104.png 150w\" sizes=\"(max-width: 1060px) 100vw, 1060px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An Application can submit a task to queue in the form of blocks either synchronously or asynchronously<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Synchronous_vs_Asynchronous\"><\/span><strong>Synchronous vs Asynchronous<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Synchronous<\/strong>: Block the execution till this Task is completed.<\/li>\n\n\n\n<li><strong>Asynchronous<\/strong>: Continue the execution of current task, while new task will execute asynchronously.<\/li>\n<\/ul>\n\n\n\n<p>Control return from the method immediately and starts executing other task.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Serial_Queue_VS_Concurrent_Queue\"><\/span><strong>Serial Queue VS Concurrent Queue<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Serial<\/strong>: One task at a time<\/li>\n\n\n\n<li><strong>Concurrent<\/strong>: Multiple tasks at a time.<\/li>\n\n\n\n<li>Even for concurrent, tasks will be dequeued serially. In a fixed order i.e. FIFO.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SerialConcurrent_vs_SyncAsync\"><\/span><strong>Serial\/Concurrent vs Sync\/Async<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Serial\/Concurrent<\/strong> affects the destination queue to which you are dispatching.<\/li>\n\n\n\n<li><strong>Sync\/Async<\/strong> affects the current thread from which you are dispatching.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Types_of_dispatch_Queues\"><\/span><strong>Types of dispatch Queues<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Main Queue<\/li>\n\n\n\n<li>System provided Global Concurrent Queues<\/li>\n\n\n\n<li>Custom Queues<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Main_Queue\"><\/span>Main Queue:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It is system created queue<\/li>\n\n\n\n<li>Serail by nature<\/li>\n\n\n\n<li>It uses Main thread. Main queue is the only queue available which uses the main thread the access to main thread is not available to any other queue be it system provided or be it user created also UI Kit is tied to main thread.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>DispatchQueue.main.async {\n Print(Thread.isMainThread ? \u201cExecution on Main Thread\u201d : \u201cExecution on other threads\u201d)\n}<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Run above command, the output will be&nbsp; <em>Execution on Main Thread.<\/em><\/strong><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Global_Concurrent_Thread\"><\/span>Global Concurrent Thread<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>System Created queue<\/li>\n\n\n\n<li>Concurrent by nature<\/li>\n\n\n\n<li>Do not use Main Thread<\/li>\n\n\n\n<li>Priorities are decided through QoS(Quality of service).<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>DispatchQueue.global().async {\n            Print(Thread.isMainThread ? \u201cExecution on Main Thread\u201d : \u201cExecution on global           concurrent queue\u201d)\n }<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Run above command, the output will be&nbsp; <em>Execution on global concurrent queue.<\/em><\/strong><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Dispatch_Group\"><\/span><strong>Dispatch Group<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>When we need to group multiple tasks together and get a callback once all of them are completed, we often encounter this situation in day-to-day work. For example, on a splash screen, we may want to make multiple API calls and only proceed to the home screen once all of them have finished. Similarly, if we&#8217;re downloading multiple images, we want to proceed when all downloads are complete. Another case could be fetching data from a database or API while showing a progress indicator, and only proceeding when both the progress animation and the data download have finished. In such scenarios, where we need to group two or more tasks together and then perform an action, a dispatch group is the solution.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import Foundation\nclass APIClient {\n    \n    func fetchUserDetails(completion: @escaping (String) -&gt; Void) {\n        \/\/ Simulate network delay\n        DispatchQueue.global().async {\n            sleep(1) \/\/ Simulating network call\n            completion(\"User Details\")\n        }\n    }\n    \n    func fetchUserPosts(completion: @escaping (&#91;String]) -&gt; Void) {\n        \/\/ Simulate network delay\n        DispatchQueue.global().async {\n            sleep(1) \/\/ Simulating network call\n            completion(&#91;\"Post 1\", \"Post 2\", \"Post 3\"])\n        }\n    }\n    \n    func fetchUserComments(completion: @escaping (&#91;String]) -&gt; Void) {\n        \/\/ Simulate network delay\n        DispatchQueue.global().async {\n            sleep(1) \/\/ Simulating network call\n            completion(&#91;\"Comment 1\", \"Comment 2\"])\n        }\n    }\n    \n    func fetchAllData(completion: @escaping (String, &#91;String], &#91;String]) -&gt; Void) {\n        let dispatchGroup = DispatchGroup()\n        var userDetails: String = \"\"\n        var userPosts: &#91;String] = &#91;]\n        var userComments: &#91;String] = &#91;]\n        \n        dispatchGroup.enter()\n        fetchUserDetails { details in\n            userDetails = details\n            dispatchGroup.leave()\n        }\n        \n        dispatchGroup.enter()\n        fetchUserPosts { posts in\n            userPosts = posts\n            dispatchGroup.leave()\n        }\n        \n        dispatchGroup.enter()\n        fetchUserComments { comments in\n            userComments = comments\n            dispatchGroup.leave()\n        }\n        \n        \/\/ Notify when all API calls are complete\n        dispatchGroup.notify(queue: .main) {\n            completion(userDetails, userPosts, userComments)\n        }\n    }\n}\n\/\/ Usage\nlet apiClient = APIClient()\napiClient.fetchAllData { userDetails, userPosts, userComments in\n    print(\"User Details: \\(userDetails)\")\n    print(\"User Posts: \\(userPosts)\")\n    print(\"User Comments: \\(userComments)\")\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Dispatch_WorkItem\"><\/span><strong>Dispatch WorkItem<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It is use to cancelling the tasks which is not executed yet using Dispatch work item.<\/li>\n\n\n\n<li>Encapsulates a block of code<\/li>\n\n\n\n<li>It can be dispatched on both DispatchQueue and DispatchGroup<\/li>\n\n\n\n<li>Provides the flexibility to cancel the task(Unless execution has started.)<\/li>\n\n\n\n<li>.cancel: if it is set \u2018true\u2019 before execution, task won\u2019t execute.<\/li>\n<\/ul>\n\n\n\n<p>If work item is cancelled during execution, \u2018cancel\u2019 will return true but execution won\u2019t abort.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Dispatch_Barrier\"><\/span><strong>Dispatch Barrier<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>dispatch barrier is used with Grand Central Dispatch (GCD) to create a synchronization point for concurrent tasks. It allows you to execute a block of code in a way that ensures no other concurrent tasks can access a shared resource while that block is executing. This is particularly useful when you want to perform a write operation to a resource while ensuring that no read or write operations occur simultaneously.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import Foundation\nlet concurrentQueue = DispatchQueue(label: \"com.example.queue\", attributes: .concurrent)\n\nvar sharedResource = &#91;Int]()\n\n\/\/ Writing data using a barrier\nconcurrentQueue.async(flags: .barrier) {\n    \/\/ This block will execute exclusively\n    for i in 1...5 {\n        sharedResource.append(i)\n    }\n    print(\"Data written: \\(sharedResource)\")\n}\n\n\/\/ Reading data\nfor _ in 1...3 {\n    concurrentQueue.async {\n        \/\/ This block can execute concurrently\n        print(\"Current resource: \\(sharedResource)\")\n    }\n}\n\n\/\/ Give some time for tasks to complete before main thread exits\nDispatchQueue.global().asyncAfter(deadline: .now() + 2) {\n    print(\"Final resource state: \\(sharedResource)\")\n}\n\n\/\/ Keep the playground running\nRunLoop.main.run()<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Dispatch_Semaphore\"><\/span><strong>Dispatch Semaphore<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>It is another one of the brilliant ways to deal with the problems of race conditions the data inconsistency related issues the access to the critical section.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1060\" height=\"696\" src=\"https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-1060x696.png\" alt=\"Dispatch Semaphore\" class=\"wp-image-10463\" srcset=\"https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-1060x696.png 1060w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-300x197.png 300w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-768x504.png 768w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-1536x1009.png 1536w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-2048x1345.png 2048w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-1024x673.png 1024w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-1320x867.png 1320w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-24x16.png 24w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-36x24.png 36w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-48x32.png 48w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-600x394.png 600w, https:\/\/www.hashstudioz.com\/blog\/wp-content\/uploads\/2024\/10\/Featured-Image_2-150x99.png 150w\" sizes=\"(max-width: 1060px) 100vw, 1060px\" \/><\/figure>\n\n\n\n<p><strong>Example:-<\/strong> In a bank, a joint account has multiple account holders, each with their own debit card. These cards can be used to withdraw money from the same account. Now, if two account holders attempt to withdraw money from different machines at exactly the same time, and the bank doesn&#8217;t handle concurrent transactions properly, it can lead to issues. For example, if both account holders are able to withdraw money simultaneously, even if the withdrawal amount exceeds the balance, both may still receive cash. This problem can be solved using a dispatch barrier. However, you may wonder, if dispatch barriers are available, what\u2019s the benefit of using dispatch semaphores? Semaphores are more powerful and provide greater control and customization when dealing with race conditions.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import Foundation\nclass BankAccount {\n    private var balance: Double\n    private let semaphore: DispatchSemaphore\n\n    init(initialBalance: Double) {\n        self.balance = initialBalance\n        self.semaphore = DispatchSemaphore(value: 1) \/\/ Only one access at a time\n    }\n\n    func deposit(amount: Double) {\n        print(\"Depositing \\(amount)...\")\n        semaphore.wait() \/\/ Wait for access\n\n        \/\/ Simulate some processing time\n      sleep(1)\n        balance += amount\n        print(\"Deposited \\(amount). New balance: \\(balance)\")\n        semaphore.signal() \/\/ Release access\n    }\n    func withdraw(amount: Double) {\n        semaphore.wait() \/\/ Wait for access\n        if amount &lt;= balance {\n            print(\"Withdrawing \\(amount)...\")\n            \/\/ Simulate some processing time\n            sleep(1)\n            balance -= amount\n            print(\"Withdrew \\(amount). New balance: \\(balance)\")\n        } else {\n            print(\"Insufficient funds for withdrawal of \\(amount). Current balance: \\(balance)\")\n        }\n     semaphore.signal() \/\/ Release access\n    }\n}\n\/\/ Create a bank account with an initial balance\nlet jointAccount = BankAccount(initialBalance: 1000.0)\n\n\/\/ Create a global dispatch queue\nlet dispatchQueue = DispatchQueue.global()\n\n\/\/ Simulate multiple account holders accessing the account\nlet operations = &#91;\n    { jointAccount.deposit(amount: 200) },\n    { jointAccount.withdraw(amount: 150) },\n    { jointAccount.withdraw(amount: 900) },\n    { jointAccount.deposit(amount: 50) },\n    { jointAccount.withdraw(amount: 100) }\n]\n\n\/\/ Dispatch operations concurrently\nfor operation in operations {\n    dispatchQueue.async(execute: operation)\n}\n\n\/\/ Allow some time for operations to complete before exiting the main thread\nsleep(10)<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Also Read:<\/strong>&#8211;  <a href=\"https:\/\/www.hashstudioz.com\/blog\/5-ios-app-testing-tools-to-consider-in-2024\/\">5 iOS app testing tools to consider in 2024<\/a><\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Dispatch_Semaphore_Benefits\"><\/span>Dispatch Semaphore Benefits<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Flexible_Resource_Management\"><\/span>1. <strong>Flexible Resource Management<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Semaphores allow you to control access to a limited number of resources (e.g., connections, threads). You can specify how many threads can access the resource simultaneously.<\/li>\n\n\n\n<li>Barriers, on the other hand, are more rigid, allowing only one write operation at a time while permitting multiple read operations.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Granular_Control\"><\/span>2. <strong>Granular Control<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>With semaphores, you can fine-tune the level of concurrency based on your specific needs (e.g., if you want 3 threads to work simultaneously, you can easily set the semaphore count to 3).<\/li>\n\n\n\n<li>Barriers don\u2019t provide this level of granularity; they either block for a write operation or allow concurrent reads.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Blocking_and_Signaling\"><\/span>3. <strong>Blocking and Signaling<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Semaphores provide a clear mechanism for waiting and signaling, allowing threads to explicitly wait for access to resources and to signal when they\u2019re done.<\/li>\n\n\n\n<li>Barriers do not have this explicit signaling mechanism; they automatically manage access based on their defined behavior.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Versatility\"><\/span>4. <strong>Versatility<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Semaphores can be used in a wider range of scenarios beyond just read\/write operations, such as throttling, managing access to limited resources, or controlling the flow of tasks.<\/li>\n\n\n\n<li>Barriers are specifically designed for synchronizing reads and writes in concurrent collections, limiting their application scope.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Reduced_Overhead\"><\/span>5. <strong>Reduced Overhead<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In scenarios where you need multiple threads to access a resource concurrently, semaphores can reduce contention and waiting time, leading to potentially better performance.<\/li>\n\n\n\n<li>Barriers can introduce overhead due to their nature of blocking other operations until the barrier is cleared.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Key_Differences_Between_Concurrency_and_Parallelism_in_Ios_Development\"><\/span><strong>Key Differences Between Concurrency and Parallelism in Ios Development:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Concurrency and parallelism are crucial concepts in iOS development, especially when dealing with tasks that involve multitasking and performance optimization. Here\u2019s a breakdown of the differences between the two:<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Concept<\/strong><\/td><td><strong>Concurrency<\/strong><\/td><td><strong>Parallelism<\/strong><\/td><\/tr><tr><td>Definition<\/td><td>Ability to manage multiple tasks at once.<\/td><td>Simultaneous execution of multiple tasks.<\/td><\/tr><tr><td>Core Usage<\/td><td>Can occur on a single-core processor through task switching.<\/td><td>Requires multiple cores for true simultaneous execution.<\/td><\/tr><tr><td>Execution<\/td><td>Tasks run independently, improving responsiveness.<\/td><td>Multiple threads run at the same time for better performance.<\/td><\/tr><tr><td>Programming<\/td><td>Implemented using asynchronous models (e.g., DispatchQueue).<\/td><td>Utilizes GCD and NSOperation for task distribution.<\/td><\/tr><tr><td>Architecture<\/td><td>Commonly used in event-driven architectures<\/td><td>Focuses on compute-intensive tasks.<\/td><\/tr><tr><td>UI Impact<\/td><td>Ensures UI remains responsive (e.g., background tasks).<\/td><td>Speeds up heavy data processing tasks (e.g., image processing).<\/td><\/tr><tr><td>Key Tools<\/td><td>DispatchQueue, and OperationQueue for managing asynchronous tasks.<\/td><td>GCD, NSOperation for parallel execution.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_HashStudioz_Improves_iOS_App_Performance_Through_Effective_Use_of_Concurrency_and_Parallelism\"><\/span><strong>How HashStudioz Improves iOS App Performance Through Effective Use of Concurrency and Parallelism<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>At <a href=\"https:\/\/www.hashstudioz.com\/\"><strong>HashStudioz<\/strong><\/a>, we understand that modern iOS applications must deliver exceptional performance and responsiveness. By effectively leveraging concurrency and parallelism, we help developers optimize their apps to meet user expectations. Here\u2019s how we do it:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Thorough_Performance_Audits\"><\/span><strong>1. Thorough Performance Audits<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>We begin by conducting comprehensive performance audits of your existing iOS applications. Our team identifies bottlenecks and inefficiencies, assessing how well your app utilizes concurrency and parallelism.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Customized_Optimization_Strategies\"><\/span><strong>2. Customized Optimization Strategies<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Based on our findings, we develop tailored optimization strategies designed to improve app performance. This includes recommending best practices for implementing concurrency and parallelism, ensuring that tasks run efficiently without blocking the main thread.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Hands-On_Training_and_Workshops\"><\/span><strong>3. Hands-On Training and Workshops<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Our workshops and training sessions empower developers with the knowledge and skills to implement concurrency and parallelism effectively. We cover topics like Grand Central Dispatch (GCD), NSOperation, and asynchronous programming, providing practical insights and hands-on experience.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Code_Samples_and_Best_Practices\"><\/span><strong>4. Code Samples and Best Practices<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>We provide access to a library of code samples and reusable templates, illustrating best practices for integrating concurrency and parallelism into your projects. These resources help developers quickly implement solutions that enhance app performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Expert_Consultation\"><\/span><strong>5. Expert Consultation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Our team of experts is available for one-on-one consultations, offering personalized guidance on addressing specific performance challenges. We work closely with you to ensure your app utilizes concurrency and parallelism to its fullest potential.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Community_Engagement\"><\/span><strong>6. Community Engagement<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>We foster a community of developers who share experiences and solutions related to app performance. Our forums and Q&amp;A sessions provide ongoing support, allowing developers to learn from one another and stay updated on best practices.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"7_Continuous_Learning_and_Updates\"><\/span><strong>7. Continuous Learning and Updates<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>We stay at the forefront of iOS development trends. We regularly update our resources and training materials to reflect the latest advancements in concurrency and parallelism, ensuring our clients are always informed.<\/p>\n\n\n\n<p>At HashStudioz, we don\u2019t just focus on optimizing performance; we\u2019re passionate about delivering excellence in every aspect of <a href=\"https:\/\/www.hashstudioz.com\/ios-application-development.html\">iOS app development<\/a>. Our diverse range of services is crafted to empower developers at every stage of the app development journey, ensuring you have the support you need to bring your vision to life.<\/p>\n\n\n\n<p><strong>Your feedback and questions are important to us! If you have any queries or concerns, feel free to reach out. Your feedback is very invaluable to me.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Did you know that over 70% of applications today utilize concurrent programming techniques to enhance performance? In a world where a single server can handle thousands of concurrent connections, understanding the nuances of concurrency and parallelism is crucial for iOS App Performance Optimization. Surprisingly, most developers don\u2019t differentiate between the two concepts, leading to inefficiencies [&hellip;]<\/p>\n","protected":false},"author":31,"featured_media":10467,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[110],"tags":[],"class_list":["post-10440","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ios-application-development"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>iOS App Performance Optimization: Concurrency to Parallelism<\/title>\n<meta name=\"description\" content=\"Improve iOS app performance by mastering concurrency and parallelism. 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