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Piggydb 2.6 (Default branch)
11-17-2008
Piggydb is a Web application for building personal knowledge base systems. You can write your knowledge in the same manner as blogging. Piggydb enables you to create highly structural knowledge by providing the features such as hierarchical tagging and flexible relationships between knowledge fragments. It encourages you to organize your knowledge continuously to discover new ideas or concepts, and moreover enrich your knowledge. License: The Apache License 2.0 Changes:|
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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