ui/src/vbt/VBTTuning.i3

 Copyright (C) 1992, Digital Equipment Corporation                         
 All rights reserved.                                                      
 See the file COPYRIGHT for a full description.                            
                                                                           
 VBTTuning.i3, coded Fri Oct 31 11:24:53 1986 by cgn 
 Last modified on Mon Feb 24 13:59:03 PST 1992 by muller  
      modified on Sat Dec 21 16:39:35 PST 1991 by gnelson 
      modified on Fri Feb  2 14:08:01 PST 1990 by glassman 
      modified on Mon Jan 12 17:12:01 1987 by msm 

<*PRAGMA LL*>

 This interface defines values that can be changed to
   maximize Trestle's performance on particular systems. 


INTERFACE VBTTuning;

IMPORT Word;

CONST
  BatchSize: CARDINAL = 325;
  BatchLatency: CARDINAL = 50000;
  HVParlim: CARDINAL = 100000;
  ZParlim: CARDINAL = 100000;
  ResumeLength: CARDINAL = 1;
  CombineLimit: CARDINAL
    = (BatchSize * ADRSIZE(Word.T)) DIV 2;

 The value BatchSize is the number of Word.T's in a standard
   painting batch.


   The value BatchLatency is the number of microseconds before a
   paint batch is automatically forced.


   The values HVParlim and ZParlim are the default
   minimum child areas (in pixels) for which ZSplit and HVSplit
   will fork separate repaint or reshaping threads.


   ResumeLength is the size that a queue of paint batches must
   shrink to before a cross-address space filter will unblock a
   thread that painted into an overfull queue.  It must
   be at least 1.


   The value CombineLimit is the number of addressable
   units (e.g., bytes) in a batch beyond which Trestle will
   not consider combining another batch into it. 


END VBTTuning.