What do you generally do to evaluate your search system's performance? Do 
you use a metrics based approach where they can compare how changes to 
scoring, analysis, or similarities effect hits in a quantitative way? Or 
something more manual?

Going through Intro to Information 
Retrieval<http://nlp.stanford.edu/IR-book/html/htmledition/evaluation-of-ranked-retrieval-results-1.html>,
 
I see they pay a lot of attention to this and I can see the advantage of 
having that kind of feedback loop, but I haven't heard too many cases of 
this being used in practice.

For my own system, I've been looking to implement bpref (PDF; see Chapter 
3.1) <http://trec.nist.gov/pubs/trec16/appendices/measures.pdf>, since I 
have fairly incomplete knowledge of which documents are relevant/irrelevant 
for my queries. I found that it would be helpful to be able to run a query 
and give some expected documents as parameters and just get back the ranks 
of those (I suppose I could implement this as a scan, but it would be nice 
to avoid the traffic). Any similar experiences?

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