[IMPALA-106] Change from Stopwatch -> WallClockStopWatch for scoped timer

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 0.3
• Fix Version/s: Impala 0.7
• Assignee: Alan Choi
• Reporter: Nong Li
• Created: 04/Mar/13 19:20
• Updated: 13/Mar/13 18:02
• Resolved: 13/Mar/13 18:02

Description

The stopwatch uses rdtsc() and the wallclock one uses gettimeofday. We should inline WallClock::GetTime() and switch to using it for scoped timers. This is both faster (5%) and more accurate.