Scheduling Criteria
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- Опубликовано: 29 авг 2019
- Operating System: Scheduling Criteria in Operating Systems.
Topics discussed:
1) CPU Utilization.
2) Throughput.
3) Turnaround Time.
4) Waiting Time.
5) Response Time.
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@@hydalfri9403 Exactly!
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Thank you very much, she explains in a great and simple way and starts with all the basics, I have a question regarding idle process why do we need it and why is it taking the most percentage of CPU, in other way why do we need to keep the processor busy all the time.
Thank You! So, the criterias for judging the efficiency of some particular scheduling algorithm are: CPU utilization, Throughput, Turn around time, waiting time, response time. by CPU utilization it means how much the CPU is utilized, it should not be left idle, throughput means number of processes executed per unit of time, turn around time means to execute a particular process from the time it is loaded into the memory to the time it gets complete, waiting time says the time processes need to wait. Lastly, response time is the time when the first response of the process is produced. There is need to understand the difference between turn around and response time.. Turn around time may get delayed due to the efficiency of output device. Therefore it may not be an appropriate factor to judge the quality of an algorithm.
respond time is frist waiting time period to get schedulded to running state or time between the process gets the cpu frist time to execute after placed in ready queue.
Turn around time may get delayed due to the efficiency of output device or inefficiency of output device ???
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u said throughput is the number of processes that are completed per time unit .. how can we calculate it since we never know when a process is gonna end !!
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can the CPU utilization reach at 100percent
Sir🙏
What criteria affect the cpu scheduler's performance ??
All of them
Sir Balanced Utilization is missing
According to Msbte 22516 book
But Hats Off to you
Sir very well explanation ☺️
1) CPU utilization
2) Throughput
- Number of processes to be executed in a time unit
3) Turnaround time
- Time between subscription of a process and its completion
4) Waiting time
- Time that a process needs to wait in the ready queue
5) Response time
- Time between process subscription to execution and first response of the program
I still did not understand
How do you define "response time"
in term of "process state".
Because based on your video regarding process state, after running state, the process goes to waiting state before I/O give response.
In this video regarding response time, if the system is too quick, too responsive, or too interactive for example like playing video game. So, you said that the response time is measured from new state to the first response provided by the
I/o. Meaning not necessarily the time taken needed for the I/o to be displayed to the user.
So in term of process state, how do you define response time?
Is it from new state to in between waiting state and event completion?
I am assuming that in between the waiting state and event completion state, there is the state where the I/o give response to the process, then goes back to ready state, then to running state then to another I/o device as to show the user about the
Effect of the first input. so, response time is the measure from new state to the first I/o response not the
I/o response that are shown to the user.
For example, if I play a video game on ps4, I press a button, when the
I/o give response to the process but
still the process does not gain access to cpu yet meaning it is just reaching ready state..
So that is the time we measure response time? Not necessarily the time for the effect of the I/o to be shown on the monitor, like for example where my player in the game is going.
respond time is frist waiting time period to get schedulded to running state or time between the process gets the cpu frist time to execute after placed in ready queue. by the way are you pubg gamer bcz i am also hardcore pubg player,playing from s4.
@@prantobhoumik6586
no i am not..
So do you mean its from "new state" to "running state" then to "waiting state" and lastly "exit state?" right
I already forgot about this
@@astaghfirullahalzimastaghf3648 no bro read my comment care fully. when the process placed in ready queue(ready state) from that time to running state(frist time it get cpu )called as response time.
The process state is like this:
1.new state:
process being created i.e load the opcode and operand of the program from hard disk to RAM. Then load them in the cache memory inside the program counter and program register.
2.ready state:
Has some flag register that tells the operating system it is ready to be executed. I.e it tells the OS how much RAM does it needs (i.e heap and stack memory and main function)
3. If OS tells the program go on..
It will begin to call other function via main function in the RAM. This means it is running state.
4. At some point, it will call the function that need to wait for i/o to response.
5. If there is an interrupt for example
OS itself want to use CPU i.e making system call, then the program goes back to ready state i.e allocates memory for main() of the program on the stack.
6. If the program finish calling its other function via its main, then it will proceed to terminating state.
7. If the function call that involve i/o device to response, it will goes back to ready state and then goes to waiting state.
8.if the program receives response from i/o device it will continue into running state and followed by terminating state.
Running state can also be defined when the program uses the cpu to make function call..
Now i think its clearer
@@prantobhoumik6586
You forgot to include time for the first i/o response to the process.
Not the time it takes to output the response.
I can read that too.
Its 786th like 🔥
4
Are U Indian ?