[IMPALA-6120] Report actual CPU time for codegen

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.11.0
• Fix Version/s: Impala 2.13.0
• Component/s: Backend
• Labels: codegen supportability
• Target Version: Product Backlog
• Epic Color: ghx-label-2
• Assignee: Bikramjeet Vig
• Reporter: Tim Armstrong
• Created: 27/Oct/17 21:30
• Updated: 19/Apr/18 18:12
• Resolved: 17/Apr/18 23:04

Description

The codegen time measurements in profiles are often confusing because they're wall-clock time and can be inflated if a host is heavily loaded. We could use ThreadCounterMeasurement to get accurate user/sys CPU time.

bikramjeet.vig interested what you think of this since it was motivated by a discussion we had.