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  1.  Home
  2. RPG400-L
  3. October 2002

timings II. const varying vs value varying

here is a performance discrepancy that happens when a string arg is passed
"const varying" ( fast ) vs "value varying" ( slow ).


** arg1 is value varying.
 pTestFunc1        b
 dTestFunc1        pi            10a
 d InString                   32000a   value varying
 c                   return    'efg'
 p                 e

** arg1 is const varying.
 pTestFunc2        b
 dTestFunc2        pi            10a
 d InString                   32000a   const varying
 c                   return    'efg'
 p                 e

 d rv              s             10a
 d ch80            s             80a   varying

** runs slow. 9663 milliseconds to do 50,000 calls.
 c                   eval      rv = TestFunc1( ch80 )
 c                   eval      rv = TestFunc2( ch80 )

** runs fast. 73 milliseconds to do 50,000 calls.
 c                   eval      rv = TestFunc1( ch80 )
 c                   eval      rv = TestFunc2( ch80 )

why the speed difference?

Steve Richter

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