It's an old REXX performance hack to mitigate the call/parsing call
overhead of EXECIO to scale better for large data sets.
You have to tune the number of reads because the overhead of storage
allocation in REXX may be the bottleneck. There's a sweet spot.
On 1/07/2013 9:12 PM, Paul Gilmartin wrote:
On Mon, 1 Jul 2013 15:44:49 +0930, Wayne Bickerdike wrote:
Why have a DO UNTIL when "EXECIO 5000 DISKR INPUT ( STEM REC. FINIS"
is all that's needed?
Perhaps because outside a test case he's unable to anticipate the
size of his data set?
-- gil
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