请教 FreeBSD 的进程调度策略

wait_rabbit

回复 9# svenwang

看来这个调度器的名字还是没变。:wink:

1. # ls /usr/src/sys/kern/sched_*
   
2. /usr/src/sys/kern/sched_4bsd.c        /usr/src/sys/kern/sched_ule.c
   

复制代码

打算找时间啃啃。

zeissoctopus

樓主，可搜尋關鍵字 kern.sched.preempt_thresh
研習相關 FreeBSD as desktop 鏈結

macafee

目前应该只有3个调度器可用:

# SCHED_4BSD is the historical, proven, BSD scheduler.  It has a global run
# queue and no CPU affinity which makes it suboptimal for SMP.  It has very
# good interactivity and priority selection.
#
# SCHED_ULE provides significant performance advantages over 4BSD on many
# workloads on SMP machines.  It supports cpu-affinity, per-cpu runqueues
# and scheduler locks.  It also has a stronger notion of interactivity
# which leads to better responsiveness even on uniprocessor machines.  This
# will eventually become the default scheduler.
#
# SCHED_STATS is a debugging option which keeps some stats in the sysctl
# tree at 'kern.sched.stats' and is useful for debugging scheduling decisions.

action08

回复 5# wait_rabbit


    这方面有专业的介绍，具体网上找找。


凭个人印象无非就是系统服务响应时间的选择策略，比如对桌面友好的就倾向于对end user实时响应，用户鼠标一动屏幕上马上就跟着动（任务切换快）；而服务器友好的调度策略更倾向于让计算机资源专注高效的干活（任务切换反应慢）

mirnshi

wait_rabbit 发表于 2013-02-14 23:36
以前打过 BFS 的补丁，确实是非常流畅。 不过这个专门为桌面设计的补丁不可能进入官方的，只能自 ...

现在就是用的ULE