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Subj:	Re: MPW parameters suggestion.

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Date: 31 Oct 90 23:05:47 GMT
From: usc!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!dali.cs.montana.edu!milton!seymour@ucsd.edu  (Richard Seymour)
Organization: University of Washington, Seattle
Subject: Re: MPW parameters suggestion.
Message-Id: <10354@milton.u.washington.edu>
References: <11383E66FAFF003CC9@ewuvms.bitnet>
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In article <11383E66FAFF003CC9@ewuvms.bitnet> DHELSING@EWUVMS.BITNET ("Dennis Helsing,  359-7080", 509) writes:
>I'm currently running VMS 5.2 on a 6410 and have had pretty good luck
>subscribing to the following rules of thumb for some MPW params...
>...some text deleted...
>MPW_HILIMIT   = 15% of the total physical memory size.
>MPW_WAITLIMIT = MPW_HILIMIT
>MPW_LOLIMIT   = half of MPW_HILIMIT
>MPW_THRESH    = 16,384
>
As he indicates in the deleted text, these are "rules of thumb"
We have a 3200-based  acquisition system with 8 megabytes 
(so much for _THRESH :-)
but the way it manipulates data and global sections suggested (and 
performance indicated we were right) 
  MPW_LOLIMIT = 93   <-- autogen's default for "when to stop writing"
  MPW_HILIMT = 3000  <-- we want no writing-to-disk unless it's LARGE
  MPW_THRESH = 1000  <-- if there's a need, start writing here
  MPW_WAITLIMIT = 6000  <--- don't freeze user processes unless REALLY tight!
  MPW_WRTCLUSTER = 96  <-- i think autogen's default -- compromise (2 tracks)

the adjustment of WAITLIMIT is what most affected us -- we wanted processes
 to continue, even if the MPW list was getting pretty large (we have pulse
 loads which do not warrant freeze-to-flush action)
 
Your mileage WILL vary...
good luck
--dick