{"id":5526,"date":"2021-03-06T09:28:39","date_gmt":"2021-03-06T09:28:39","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=5526"},"modified":"2023-08-31T10:56:33","modified_gmt":"2023-08-31T05:26:33","slug":"rtos-vs-gpos-task-scheduling","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/rtos-vs-gpos-task-scheduling\/","title":{"rendered":"FreeRTOS Lecture 3 &#8211; RTOS vs GPOS: Task Scheduling"},"content":{"rendered":"<div class=\"boldgrid-section\" style=\"background-image: linear-gradient(to left, #eeeeee, #eeeeee);\" data-bg-color-1=\"#EEEEEE\" data-bg-color-2=\"#EEEEEE\" data-bg-direction=\"to left\">\n<div class=\"container\">\n<div class=\"row\" style=\"padding-top: 25px; padding-bottom: 0px; background-image: linear-gradient(to left, #eeeeee, #eeeeee);\" data-bg-color-1=\"#EEEEEE\" data-bg-color-2=\"#EEEEEE\" data-bg-direction=\"to left\">\n<div class=\"col-md-1 col-sm-12 col-xs-12 col-lg-1\">\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"col-md-10 col-sm-12 col-xs-12 col-lg-10\">\n<h1 class=\"\" style=\"text-align: center; font-size: 30px; border-width: 0px; line-height: 45px;\"><span style=\"color: #000000;\"><span style=\"color: #000080;\">RTOS vs GPOS: Task Scheduling<\/span>&nbsp;<\/span><\/h1>\n<div class=\"row bg-editor-hr-wrap\" style=\"border-width: 0px; margin-top: -25px;\">\n<div class=\"col-lg-12 col-md-12 col-xs-12 col-sm-12\">\n<div>\n<p>&nbsp;<\/p>\n<div class=\"bg-hr bg-hr-10 color2-color\" style=\"border-style: solid; border-width: 0px 0px 3px;\"><\/div>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">Difference between the Real-Time Operating System(RTOS) and the General-Purpose Operating System(GPOS) in terms of task scheduling.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">GPOS is programmed to handle scheduling in such a way that it manages to achieve high throughput. Here throughput means the total number of processes that complete their execution per unit time. In such cases, sometimes execution of a high priority process will get delayed in order to serve 5 or 6 low priority tasks. High throughput is achieved by serving 5 lower priority tasks than by serving a single high priority one. So, if 5 or 6 low priority tasks are waiting to run, then it will delay the high priority task, and it will allow the lower priority task to run in order to maintain the higher throughput.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">In a GPOS, the scheduler typically uses a fairness policy to dispatch threads and processes onto the CPU. Such a policy enables the high overall throughput required by desktop and server applications but offers no guarantees that high priority, time-critical threads or processes will execute in preference to lower priority threads. On the other hand, in RTOS, threads execute in the order of their priority. If a high-priority thread becomes ready to run, it will take over the CPU from any lower-priority thread that may be executing. Here a high-priority thread gets executed over the low-priority ones. All low priority thread execution will get paused. A high priority thread execution will get override only if a request comes from an even high priority thread.<\/span><\/p>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 20px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><strong><span style=\"color: #ff0000;\">Does that mean RTOS is very poor in delivering throughput?<\/span><\/strong><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">The fact is a Real-Time Operating System may yield less throughput than a General-Purpose OS because it always favors the high-priority task to execute first, but that doesn\u2019t mean it has very poor throughput because these two operating systems that is GPOS and Real-Time Operating Systems, are used entirely in different scenarios. <\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">The GPOS is always loaded with heavy processes and more processes. But a Real-Time Operating System, most of the time, is loaded with a fewer number of tasks. A throughput is actually relative to the load of the system.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">A quality RTOS will still deliver decent overall throughput but can sacrifice throughput to be deterministic or achieve time predictability. For the RTOS, achieving predictability or time deterministic nature is more important than throughput, but for the GPOS achieving higher throughput for user convenience is more important.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\">In the next article, let&#8217;s learn <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/fastbitlab.com\/rtos-vs-gpos-latency\/\" target=\"_blank\" rel=\"noopener\">RTOS vs GPOS : Latency<\/a><\/span>.<\/p>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 20px; line-height: 26px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"color: #000080;\"><b>FastBit Embedded Brain Academy Courses&nbsp;<\/b><\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-size: 17px;\"><b> <\/b><span style=\"font-weight: 400; color: #000000;\">click here: <\/span><span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/fastbitlab.com\/course1\"><span style=\"font-weight: 400;\">https:\/\/fastbitlab.com\/course1<\/span><\/a><\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; RTOS vs GPOS: Task Scheduling&nbsp; &nbsp; &nbsp; Difference between the Real-Time Operating System(RTOS) and the General-Purpose Operating System(GPOS) in terms of task scheduling. GPOS is programmed to handle scheduling in such a way that it manages to achieve high throughput. Here throughput means the total number of processes that complete their execution per unit [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5532,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[],"footnotes":""},"categories":[8],"tags":[19],"class_list":["post-5526","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-freertos-lectures","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RTOS vs GPOS: Task Scheduling Differences and Priorities<\/title>\n<meta name=\"description\" content=\"Explore the task scheduling disparities between Real-Time Operating Systems (RTOS) and General-Purpose Operating Systems (GPOS). 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