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From John Menzer <standar...@gmx.net>
Subject time measuring
Date Sat, 12 Apr 2008 21:17:20 GMT


Since I have to compare hadoop performance to other technologies like MPI i
need to know how and what to measure.
in hadoop the web ui for the jobtracker provides for each successful job
information like:

Started at: Sat Apr 12 22:34:24 CEST 2008
Finished at: Sat Apr 12 22:35:03 CEST 2008
Finished in: 38sec

what exactly does that mean?

how are these times determined? when is a job finished? which event
'triggers the clock' to stop and say: 'hey, the job is finished!'. 
console output (saying 'job complete') takes longer than (in that case) 38

how does the shell script check if a job is finished and what does
'finished' actually mean? are there any special signals around?

thank you for any detailed information.

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