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  Per the ongoing discussion of slowness in GENIE spline generation I ran some test samples with trunk (as of 2016-07-18) and R-2_10_6 -- both using the same underlying support code, e.g. ROOT, GSL....

I used my DAG generating script which runs in stages:

1) generate { nu nu-bar } x {  e mu tau } x { free-n free-p } = 12 jobs

2) combine those

3) generated all 6 nu flavors on a single (A,Z) isotope = 106 jobs

For these tests I generated only sub-sets of the EventGeneratorList:  RES DIS QE CCMEC

and for 100 knots up to 400 GeV.

Here's a link to my evernote with numbers:

major standouts (# = sum of wall clock time in seconds):

RES stage 1   (trunk) 237134 / (r2106) 341309 = 0.7    e.g. faster 

DIS   stage 1   (trunk) 687672 / (r2106) 209392 = 3.28  e.g. slower

QE   stage 3   (trunk)   51753 / (r2106) 107353 = 0.48  e.g. faster

CCMEC stage 3   (trunk) 101307 / (r2106)   86677 = 1.17  e.g. slower

This seems to implicate DIS generation as the big problem.  I don't remember any big changes to that code per se.  Does trunk switch away from using LHAPDF for the parton distributions?  Perhaps that's a performance issue?

-robert