Raw data output

[Petr Stefan]

Hi,

I'm student of Mathematics and Physics Faculty, Charles University in 
Prague. I'm now working at Department of Distributed and Dependable 
Systems under the supervision of Petr Tuma, Lubomir Bulej and Vojtech 
Horky. We'd like to use JMH tool for collecting benchmarking data and 
use them for processing in our custom tools (like standalone part of SPL 
- http://d3s.mff.cuni.cz/research/development_awareness/). But now, JMH 
doesn't support collecting very raw data (rawData list from JSON output 
holds just mean from each iteration - except SingleShot benchmarking 
mode where the mean is the actual value). But we found out, that 
Statistics class (all it's implementations) has the raw data inside, so 
we propose a patch, which adds a getter for this data. The raw data 
aren't ordered by creation time, but that shouldn't be a problem for our 
purpose and fixing this will require bigger changes in JMH itself.

On top of that, we propose second patch with a new file printer for 
collected raw values. It prints some common headers and then just the 
raw data with corresponding units. We chosen JSON format without pretty 
indentation, which is compromise between file size (we expect large 
amount of values) and human readability. The headers are at the same 
format as headers in current JSON printer.

Please look at proposed changes and give me a feedback. We're open to 
changes and improvements.

Cheers,

Petr Stefan

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