03-31-2009
Pintos Advanced Scheduler
I am in an operating system class at my college and recently we have been modifying the Pintos operating system in C. I have eliminated the Round Robin Scheduling and implemented priority scheduling just fine but now I have hit a wall on how to implement Advanced Scheduling and was hoping anyone here had advice on what to do, my professor has been unreachable so my questions remain.
The requirements were like so:
"You must write your code to allow us to choose a scheduling algorithm policy at Pintos startup time. By default, the priority scheduler must be active, but we must be able to choose the 4.4BSD scheduler with the -mlfqs kernel option. Passing this option sets thread_mlfqs, declared in threads/thread.h, to true when the options are parsed by parse_options(), which happens early in main().
When the 4.4BSD scheduler is enabled, threads no longer directly control their own priorities. The priority argument to thread_create() should be ignored, as well as any calls to thread_set_priority(), and thread_get_priority() should return the thread's current priority as set by the scheduler."
If anyone has any experience with pintos please let me know I've been trying this for about 6 hours and gotten nowhere.
8 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I am using Sun Solaris
Where I can find scheduler program that can run another program automatically on scheduled time?
Thank you. (1 Reply)
Discussion started by: wadiachmed
1 Replies
2. Solaris
Hi all,
Is anybody have any idea on Control-M schedular(bmcsoftware product) on Solaris/UNIX environment.If yes,can you please help me how to set it up and schedule a job.
Please!!! it's Urgent!!!
Regards,
Uday (0 Replies)
Discussion started by: uday123
0 Replies
3. HP-UX
My HPUX server can't accept all lp jobs for all my printers... I pinged the print servers and they are fine, ran lpstat -r and shows me that the scheduler is running, lpstat -t shows nothing and won't get back to # unless i terminate it, lpstat -a shows all printers fine, but in SAM it failed to... (1 Reply)
Discussion started by: amao
1 Replies
4. UNIX for Advanced & Expert Users
Hi,
what i need to do is build my own scheduler program.
I am supposed to display my own prompt. at this prompt i accept a command in the following format.
ls -l start 0:0:10:10 period 10 end 0:0:0:10
now this command should be executed in the background starting at 10 mins and 10 secs... (2 Replies)
Discussion started by: p_aishwarya
2 Replies
5. Solaris
I have akorn shell job that I can run manually but when I run via cron it starts and finishes, but does not do what it does when I run it manually.
Any ideals on why this is happening? (3 Replies)
Discussion started by: CAGIRL
3 Replies
6. UNIX for Dummies Questions & Answers
HI could you comment on my small doubts below
1. which type of sheduler is used inb linux?? is it round robin or multi queue priority based round robin ???
2. Which process has the PID 0 ?? if it is sheduler process then how to convinience myself?? i mean how to see on the system...?? is... (0 Replies)
Discussion started by: raj_b025
0 Replies
7. Shell Programming and Scripting
Hi,
My requirement is i want to send mails from server to all my employess with one attachment file for every monday and friday like scheduler.. how it is possible through bash script. please guide me..
With Regards
Anish Kumar.V (8 Replies)
Discussion started by: anishkumarv
8 Replies
8. UNIX for Advanced & Expert Users
Hello
i am looking for good and popular application run on linux OS as centos to give same function as crontab
i am seeking task scheduler with web portal and logs and so on
i preferred good tool freeware.
thanks for help (1 Reply)
Discussion started by: mogabr
1 Replies
sched.h(3HEAD) Headers sched.h(3HEAD)
NAME
sched.h, sched - execution scheduling
SYNOPSIS
#include <sched.h>
DESCRIPTION
The <sched.h> header defines the sched_param structure, which contains the scheduling parameters required for implementation of each sup-
ported scheduling policy. This structure contains the following member:
int sched_priority process execution scheduling priority
Each process is controlled by an associated scheduling policy and priority. Associated with each policy is a priority range. Each policy
definition specifies the minimum priority range for that policy. The priority ranges for each policy may overlap the priority ranges of
other policies.
The scheduling policies are indicated by the values of the following symbolic constants:
SCHED_FIFO Processes are scheduled according to the First-In-First-Out (FIFO) policy. Processes scheduled to this policy, if not pre-
empted by a higher priority or interrupted by a signal, will proceed until completion.
SCHED_RR Processes are scheduled according to the Round-Robin (RR) policy. Processes scheduled to this policy, if not pre-empted by
a higher priority or interrupted by a signal, will execute for a time period, returned by sched_rr_get_interval(3RT) or by
the system.
SCHED_IA Processes are scheduled according to the Inter-Active Class (IA) policy as described in priocntl(2).
SCHED_OTHER Processes are scheduled according to another policy not described above.
The values of these constants are distinct.
Inclusion of the <sched.h> header will make visible symbols defined in the header <time.h>.
SEE ALSO
priocntl(2), sched_rr_get_interval(3RT), time.h(3HEAD)
SunOS 5.10 4 Oct 2001 sched.h(3HEAD)