New performance test tool - overhead

[Erez Hadad <ER...@il.ibm.com>]

Hi folks,

I'm working on a performance-sensitive application based on OpenWhisk. As 
part of this work, I need to measure both latency and throughput of 
actions and of rules, and separate the action execution time from the 
OpenWhisk processing (=overhead) time. 
Lacking a proper tool for the task, I developed one, which is currently at 
a this repo: https://github.com/ibmerezh/overhead
This tool contains several new capabilities beyond benchmarking rules, 
such as deeper profiling based on timestamps from the activation records 
and more. Please have a look at the README.md for details.

Please review, use the tool, and comment - I'd like to consider a PR for 
adding this tool to the OW repo.
 
Regards,
-- Erez

Erez Hadad, PhD
Cloud System Technologies
IBM Research - Haifa
email: erezh@il.ibm.com
phone: +972-4-829-6509