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Topic: CS 385 Operating Systems
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Pshah  50
11-06-2002 10:35 PM ET (US)
Yes that would be good
Akhan  51
11-06-2002 10:35 PM ET (US)
Yes, gives more time to cover all the algorithms
LRU  52
11-20-2002 06:00 PM ET (US)
What is LRU in the new assigment?
Re: LRU  53
11-20-2002 06:28 PM ET (US)
Least Recently Used.
LRU Time Stamp  54
11-20-2002 06:34 PM ET (US)
What is this time stamp? do we use get_clock() to get the time stamp?
project1  55
11-21-2002 02:41 AM ET (US)
hello prof. It will be greatly appreciated if you can post the solution to the first project online. Thanks
Valid Bit??  56
11-24-2002 10:33 AM ET (US)
in the deallocate() fuction, what does it mean by valid?
get_page()  57
11-24-2002 08:15 PM ET (US)
In the get_page() function, how do we know how many pages or frames a process need?
prepage  58
12-01-2002 05:13 PM ET (US)
How many times should a process be prepaged? 0 ?

This is from a run on the prof's OSP.demo

Total num of pages swapped out = 532
  due to page faults = 391
  due to page locks set by I/O = 99
  due to prepaging = 42


and this is mine:
Total num of pages swapped out = 248
  due to page faults = 189
  due to page locks set by I/O = 59
  due to prepaging = 0


If we aren't doing prepaging.. how come the .demo swaps pages due to prepaging?
whatever  59
12-01-2002 08:13 PM ET (US)
do you need to reset lock_count to 0 in the deallocate() function??
prepage  60
12-02-2002 12:39 AM ET (US)
no... because it could be locked more than once, so you just decrese it
siodrum  61
12-02-2002 06:56 AM ET (US)
Edited by author 12-02-2002 06:57 AM
does anyone's program do this? (like demo)
after dispatch(pcb 0) prepageing and before dispatch(pcb 0) process dispatched, Simcore swaps in page o & 1 of pcb 0 by calling siodrum. Mine doesn't swap in anything here.
hshang  62
12-08-2002 10:37 AM ET (US)
can you post the solution of homework#4?
CS385  63
12-09-2002 01:36 PM ET (US)
Edited by author 12-09-2002 01:37 PM
Hi prof. reed, I was wondering if you are going to post some review topics and some practice questions for the final exam. I believe u said in class that once you make the exam you will post some info regarding final exam topics and format of the exam. Thanks for your time
HomeWork 4  64
12-10-2002 08:15 PM ET (US)
Can any 1 who has perfect score on hw4 post his/her answer?
Final  65
12-11-2002 06:57 PM ET (US)
Does anyone know what chapters/sections exactly we need to review for the final exam.
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