SUMMARY: Slowscan & Fastscan

From: Anchi Zhang (anchi@starbase.neosoft.com)
Date: Fri Jan 13 1995 - 05:37:51 CST


My original posting:

  What are the Solaris 2.3 kernel parameters SLOWSCAN & FASTSCAN?

Many thanks to

  "Frank 'Scruffy' Miller" <Frank.Miller@master.CNA.TEK.COM>
  Richard Sands <ras@wildfire.cv.com>
  mark@ccifl.com (Mark Sigler)
  rmills@ccd.harris.com (Richard C. Mills)
  blymn@awadi.com.AU (Brett Lymn)
  Kevin.Sheehan@uniq.com.au (Kevin Sheehan {Consulting Poster Child})
  Mark.Hickey@ov.com

some of who quoted from Adrian Cockcroft's 'Sun Performance & Tuning'
book:

  Slowscan is the number of pages scanned per second by the (paging)
  algorithm when there is just under lotsfree (memory) available; it is
  usually set to fastscan/10.

  Fastscan is the number of pages scanned per second by the (paging)
  algorithm when there is no memory available, & is usually set to 1000.
  There is a linear ramp up from slowscan to fastscan as freem memory
  goes from lotsfree to zero.

Richard Sands and Richard C. Mills further offered the means to modify
these values in /etc/system:

  set fastscan=????
  set slowscan=????

Mark Hickey also suggested to pull the paper Sun Performance Tuning By
Adrian Cockcroft from the Sun archive at sunsite.unc.edu. I ordered
a copy of Cockcroft's book today from SunExpress for $35.

Anchi



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