Re: Design/structure X3 parser more like Qi parser

On 12/13/2016 11:56 AM, Seth wrote:
[snip]
 >
 > Hope this helps someone spot an improvement/cause of the poor 
performance.
 >
 > Cheers,
 > Seth
Seth, and anyone else who might be interested in helping
find the cause of the poor performance, I've uploaded:

   summary.chrono-csv-*.out

to:

https://github.com/cppljevans/spirit/tree/develop/workbench/x3/csv_parser

which shows that at -O0, x3 performs better, but as the
optimization increases, qi begins to perform better.

Since the crossover of performance occurs between -O0 and
-O1 for the gcc compiler, I also uploaded profile's for
those to optimization's for gcc to:

https://github.com/cppljevans/spirit/blob/develop/workbench/x3/csv_parser/gprof-csv-x3_ns_rdef-spirit-GET0-XRULE0-OptO0-gcc6_20151018.flat_graph
https://github.com/cppljevans/spirit/blob/develop/workbench/x3/csv_parser/gprof-csv-x3_ns_rdef-spirit-GET0-XRULE0-OptO1-gcc6_20151018.flat_graph

At the moment, based on the contents of those files, I'm
unable to discern any likely cause of the poor performance.

I'm hoping that someone reading this, with more experience
with and understanding of gprof, could infer some likely
cause of the poor performance.  If so, maybe they could
suggest some change to improve the performance which I would
gratefully implement and report back here with the results.

-regards,
Larry




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