SCHED_4BSD(4) BSD Kernel Interfaces Manual SCHED_4BSD(4)NAME
sched_4bsd -- 4.4BSD scheduler
SYNOPSIS
options SCHED_4BSD
DESCRIPTION
The sched_4bsd scheduler is the traditional system scheduler, providing both high throughput and solid interactive response in the presence
of load.
The following sysctls are relevant to the operation of sched_4bsd:
kern.sched.name
This read-only sysctl reports the name of the active scheduler.
kern.sched.quantum
This read-write sysctl reports or sets the length of the quantum (in micro-seconds) granted to a thread.
kern.sched.ipiwakeup.enabled
This read-write sysctl sets whether or not the scheduler will generate an inter-processor interrupt (IPI) to an idle CPU when a
thread is woken up. Otherwise, idle CPUs will wait until the next clock tick before looking for new work.
kern.sched.preemption
This read-only sysctl reports whether or not the kernel is configured to support preemption, which reduces the latency to run lower
priority threads on wakeup.
Some sysctls will be available only on systems supporting SMP.
SEE ALSO sched_ule(4), sysctl(8)HISTORY
The sched_4bsd scheduler has been present, in various forms, since the inception of BSD.
BUGS
While a highly robust and time-tested scheduler, sched_4bsd lacks specific knowledge of how to schedule advantageously in non-symmetric pro-
cessor configurations, such as hyper-threading.
BSD January 21, 2008 BSD
Check Out this Related Man Page
SYSCTL.CONF(5) BSD File Formats Manual SYSCTL.CONF(5)NAME
sysctl.conf -- kernel state defaults
DESCRIPTION
The /etc/sysctl.conf file is read in when the system goes into multi-user mode to set default settings for the kernel. The /etc/sysctl.conf
is in the format of the sysctl(8) command, i.e.
sysctl_mib=value
Comments are denoted by a ``#'' at the beginning of a line. Comments can also exist at the end of a line, as seen in the EXAMPLES section,
below.
FILES
/etc/sysctl.conf Initial settings for sysctl(8).
EXAMPLES
To turn off logging of programs that exit due to fatal signals you may use a configuration like
# Configure logging.
kern.logsigexit=0 # Do not log fatal signal exits (e.g. sig 11)
SEE ALSO rc.conf(5), rc(8), sysctl(8)HISTORY
The sysctl.conf file appeared in FreeBSD 4.0.
BUGS
If loadable kernel modules are used to introduce additional kernel functionality and sysctls to manage that functionality, sysctl.conf may be
processed too early in the boot process to set those sysctls. For example, sysctls to manage the linux emulator cannot be set in sysctl.conf
if the linux emulator is loaded as a module rather than compiled into the kernel.
BSD December 30, 1999 BSD
I was wondering if anyone has any information if UNIX/LINUX will be viable with quantum computing. I have very limited knowledge of quantum physics vs. Quantum computing and the correlation to UNIX/LINUX? (6 Replies)
hi
i am needed to use tidal's scheduler to schedule unix scripts available on server A. while creating a job to be scheduled, it has an option called command which will take a path of the file. i have seen several examples in the following way
e:\tidal\bin\sleep.exe
here i did not understand two... (0 Replies)
Hi Everyone,
I have a problem with the queue on a Zebra printer.
I wanted to find where the scheduler logs are. Found a document:
http://www.redbooks.ibm.com/redbooks/pdfs/sg245496.pdf
The problem is the chapters 12.3 and 12.4 mention the logs should
be in /var/lp and I do not have such a... (0 Replies)
I want to set the priority and the scheduler as SCHED_FIFO for two threads . I want to see that the thread with high priority will run forever .
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I am executing the code as root.
I expect to see... (0 Replies)
Hi,
I'm new to this site. I am getting an error:
syslog: fctl: WARNING: fp(2)::PLOGI to a7200 failed. state=a reason=3. (Restricted Access Project)
Hope someone can help me on this. BTW, it is running on SunOS 5.10 Generic_118833-36 sun4v sparc SUNW,Sun-Fire-T200.
Thanks. (1 Reply)
Hi,
May I pls. know what would be the equivalent kernel parameter in HP-UX for the below Linux kernel parameter.
sysctl kern.ps_showallprocs - This setting in Linux would let users see their own processes in "ps".
Thanks,
Narasimha (1 Reply)
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)
I want to know the memory capacity and types of memories, processor and more...
What kind of aplications this OS attends?
Archicture/system classification (Hybrid, monolithic, multitasking, micro-kernel, layered, Another..?
Explain it to me... I really need to understand and know that.
Any... (3 Replies)
I am trying to schedule a script in Linux to between 8th and the 31st of each month on Sundays @ 6:50 only and i scheduled it as follows:
50 6 8-31 * 0 ksh /home/cpac/SPID_Files/GetFiles.ksh
Which did it run on the 8th on Saturday instead of only Sundays !!! (3 Replies)