08-17-2012
Another way to look at UNIX/Linux:
A range of scale from small to ridiculous:
It runs some kids toys, your refrigerator, your android, your car, most electric utility billing systems, and very LARGE computer clusters that have thousands of individual computers working on a single problem.
Some of the world's fastest installations are UNIX/Linux clusters.
So it is literally everywhere.
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LEARN ABOUT DEBIAN
sched_4bsd
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