Jim McAlpine wrote:
I'm looking at the Enterprise COBOL Performance Tuning paper regarding the
ARITH(EXTEND) compiler option which says -
| *ARITH - EXTEND or COMPAT
*
| The ARITH compiler option allows you to control the maximum number of
digits allowed for decimal
| numbers (packed decimal, zoned decimal, and numeric-edited data items and
numeric literals). With
| ARITH(EXTEND), the maximum number of digits is 31; with ARITH(COMPAT),
the
maximum number
| of digits is 18. However, ARITH(EXTEND) will cause some degradation in
performance for all decimal
| data types due to larger intermediate results. The amount of degradation
that you experience depends directly
| on the amount of decimal data that you use.
| Performance considerations using ARITH:
| On the average, ARITH(EXTEND) was 1% slower than ARITH(COMPAT), with a
range of equiv-
| alent to 38% slower.
| (*COB PG: *pp 37, 41, 48-49, 95, 283-284, 557-566)
Can anyone say what "with a range of equivalent to 38% slower" means. It
doesn't make sense to me. I don't even think it's English.
I believe the interpretation is: "The best case was some program
ran at the same speed with ARITH(EXTEND) as with ARITH(COMPAT);
in the worst case, some program ran 38% slower with ARITH(EXTEND)
compared to running when compiled with ARITH(COMPAT)".
Kind regards,
-Steve Comstock
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