[ARROW-14341] [C++] Refine decimal benchmark

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 6.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/29911
• Assignee: Yibo Cai
• Reporter: Yibo Cai
• Created: 15/Oct/21 10:18
• Updated: 11/Jan/23 08:39
• Resolved: 19/Oct/21 15:38

Description

Decimal benchmark mixes +-*/ operations in one test loop[1]. Divide always dominates the result. It's ~6x slower than multiplication, let alone addition.
It's better to test division, multiplication, addition/subtraction separately to get more reasonable results.

[1] https://github.com/apache/arrow/blob/master/cpp/src/arrow/util/decimal_benchmark.cc#L141-L145

Issue Links

• links to: GitHub Pull Request #11458