HP OpenVMS Systems

Arrays and row- or column-order?

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The Question is:

 
how to load arrays to minimize page faults??
 

The Answer is :

 
  Either in column order or row order, depending both on the language used
  and on the most common reference -- the intent is to keep most data items
  and most address references located closely together, and thus to reduce
  the number of page faults incurred.  (This page faulting activity is
  typically a performance factor only for large arrays, or arrays that
  cannot otherwise be held in the process working set.)
 
  For your specific application, a trivial program and a couple of seconds
  within the OpenVMS debugger will tell you which way the addresses run for
  the current language and the current application.
 

  

     

     
answer written or last revised on ( 8-SEP-1999 )
     
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