scheduling

Question

For calculation of turn around time = completion time -arrival time
and as i know that arrival time is time at which process arrives in ready state/ready queue
   but in galvin book it is given thatit also includes "periods spent waiting
to get into memory," i think it is before get into memory. bt it is not into( completion time -arrival time) so why we r not including that in t.a.t.

Answer 1

It is possible if we swapped out the process, means put it in secondary memory from main memory. there it will wait to get back into main memory.

Answer 2

TAT means total time a process spends inside the system..it includes everything...CPU burst ,IO burst...waiting etc...
means from the time process arrived in the ready queue till it gets completed..everything is under TAT...

Comments

ok that is fine can u plzz tell me what is "time spent waiting
to get into memory,"
     

---

can u please post the screenshot of that para..with just this one line m nt getting it....obviously it is not from new to ready....because we start when process enters ready queue...

---

check on previous comment ....

---

i think after getting "completed" the process will go into main memory or secondary memory.....waiting for memory could mean this only...because they have included all remaining states...and if we are using the word"process"...we start from ready queue...so this is what i can infer from this...