What is Scheduling ?<\/h2>\n<\/div>\n<\/div>\n

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• Scheduling is an essential part of a Multiprogramming operating systems.<\/li>\n
• Such operating systems allow more than one process to be loaded into the executable memory at a given time and the loaded process shares from the CPU using time multiplexing.<\/li>\n
• The Operating System maintains the following important process scheduling queues \u2212\n
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  • Job queue \u2212 This queue preserves all the processes in the system.<\/li>\n
  • Ready queue \u2212 This queue keeps a set of all processes residing in main memory, ready and waiting to execute. A new process is always placed in this queue.<\/li>\n
  • Device queues \u2212 The processes which are blocked due to inaccessibility of an I\/O device establish this queue.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
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    <\/div>\n<\/div>\n

    What is Scheduling<\/p>\n

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    • The OS can use different procedures to manage each queue (FIFO, Round Robin, Priority, etc.).<\/li>\n
    • The OS scheduler determines how to move from processes between the ready and run queues which can only have one entry per processor core on the system; in the above diagram, it has been combined with the CPU.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
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      Schedulers are of three types:<\/h2>\n<\/div>\n<\/div>\n

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      • Long-Term Scheduler<\/li>\n
      • Short-Term Scheduler<\/li>\n
      • Medium-Term Scheduler<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
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        Long Term Scheduler:<\/h2>\n<\/div>\n<\/div>\n

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        • It is also called a job scheduler.<\/li>\n
        • It selects processes from the queue and loads into memory for execution.<\/li>\n
        • The long-term scheduler may not be accessible or minimal.<\/li>\n
        • No long-term scheduler in the time-sharing operating systems.<\/li>\n
        • Use of long-term scheduler when a process changes the state from new to ready.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
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          Short Term Scheduler:<\/h2>\n<\/div>\n<\/div>\n

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          • Short term scheduler is also known as CPU scheduler.<\/li>\n
          • It is used to improve system performance.<\/li>\n
          • It is change from ready state to running state of the process.<\/li>\n
          • Short term scheduler is faster than compared to long term scheduler.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
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            Medium Term Scheduler:<\/h2>\n<\/div>\n<\/div>\n

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            • Medium-term scheduling is a part of swapping.<\/li>\n
            • Medium Term Scheduler has removed the processes from the memory.<\/li>\n
            • To remove the process from memory and make space to the other processes, the postponed process is moved to the secondary storage.<\/li>\n
            • This process is called swapping.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

              Answer : Scheduling is an essential part of a Multiprogramming operating systems…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"passster_activate_protection":false,"passster_protect_child_pages":"","passster_protection_type":"password","passster_password":"","passster_activate_overwrite_defaults":"","passster_headline":"","passster_instruction":"","passster_placeholder":"","passster_button":"","passster_id":"","passster_activate_misc_settings":"","passster_redirect_url":"","passster_hide":"no","passster_area_shortcode":"","gtb_hide_title":false,"gtb_wrap_title":false,"gtb_class_title":"","gtb_remove_headerfooter":false,"footnotes":""},"categories":[7762],"tags":[195,201,491,360,5937,15899,368,203,199,214,7877,209,7874,7894,7882,7876,205,7870,7889,7886,7872,7868,222,484,362,196,212,213,207,366,7893,361,204,7888,7887,7890,7875,7880,7879,7869,7799,367,7892,206,7881,7884,7883,7867,7885,7871,7873,7891,975,200,7865,7866,197,280,364,7878,7864],"class_list":["post-1117","post","type-post","status-publish","format-standard","hentry","category-operating-system","tag-accenture-interview-questions-and-answers","tag-allstate-solutions-pvt-ltd-interview-questions-and-answers","tag-applied-materials-interview-questions-and-answers","tag-atos-interview-questions-and-answers","tag-aveva-software-interview-questions-and-answers","tag-barracuda-networks-interview-questions-and-answers","tag-bmc-software-interview-questions-and-answers","tag-capgemini-interview-questions-and-answers","tag-casting-networks-india-pvt-limited-interview-questions-and-answers","tag-cgi-group-inc-interview-questions-and-answers","tag-cheduling-in-os","tag-collabera-technologies-interview-questions-and-answers","tag-cpu-scheduling","tag-cpu-scheduling-algorithm-in-os","tag-cpu-scheduling-algorithms","tag-cpu-scheduling-in-operating-systems","tag-dell-international-services-india-pvt-ltd-interview-questions-and-answers","tag-describe-the-differences-among-short-term-medium-term-and-long-term-scheduling","tag-disk-scheduling","tag-disk-scheduling-in-operating-system","tag-fcfs-scheduling","tag-fifo-scheduling","tag-flipkart-interview-questions-and-answers","tag-genpact-interview-questions-and-answers","tag-hcl-technologies-interview-questions-and-answers","tag-ibm-interview-questions-and-answers","tag-indecomm-global-services-interview-questions-and-answers","tag-infosys-technologies-interview-questions-and-answers","tag-mphasis-interview-questions-and-answers","tag-netapp-interview-questions-and-answers","tag-online-scheduling-system","tag-opentext-technologies-interview-questions-and-answers","tag-oracle-corporation-interview-questions-and-answers","tag-preemptive-and-nonpreemptive-scheduling","tag-preemptive-scheduling","tag-priority-scheduling","tag-process-scheduling","tag-process-scheduling-algorithms","tag-process-scheduling-in-operating-system","tag-production-scheduling-techniques","tag-prokarma-sof-interview-questions-and-answers","tag-rbs-india-development-centre-pvt-ltd-interview-questions-and-answers","tag-real-time-scheduling-in-operating-system","tag-sap-labs-india-pvt-ltd-interview-questions-and-answers","tag-scheduling-algorithms","tag-scheduling-algorithms-in-operating-system","tag-scheduling-algorithms-in-os","tag-scheduling-criteria","tag-scheduling-criteria-in-operating-system","tag-scheduling-criteria-in-os","tag-scheduling-in-operating-system","tag-scheduling-system","tag-tata-consultancy-service-interview-questions-and-answers","tag-tech-mahindra-interview-questions-and-answers","tag-types-of-scheduling-algorithms","tag-types-of-scheduling-in-operations-management","tag-unitedhealth-group-interview-questions-and-answers","tag-virtusa-consulting-services-pvt-ltd-interview-questions-and-answers","tag-wells-fargo-interview-questions-and-answers","tag-what-is-schedule","tag-what-is-scheduling-in-os"],"yoast_head":"\n