Re: For loop benchmarks between Octave versions

[Julien Bect]

Le 17/06/2014 02:39, Rik a écrit :
> I find that this changeset:
>
> 12920:5d18231eee00 Extend profiling support to operators.
>
> produces a 50% slow down when using the for loop benchmark. Unless we 
> can figure out a lower footprint way to do profiling we might be stuck 
> with this part of the slowdown. There is still another 50% which seems 
> to be due to other accumulated cruft, i.e., I didn't find a smoking 
> gun changeset.

I have built revision 12922 (Thu, 04 Aug 2011, default branch, just 
after the above-mentioned changeset)with my "inlining +template" patch 
for the profiler.

My benchmarks indicate that this patched revision is even slightly 
better than Octave 3.4.3 :

                             Octave 3.4.3 r12922 + patch
         doubleForLoop/1     114.9 [  0.9]     108.4 [ 1.9]   evol:  -5.6%
       doubleForLoop/a=1     165.5 [  0.6]     154.5 [ 1.8]   evol:  -6.6%
       doubleForLoop/a=b     190.2 [  0.7]     169.2 [ 0.9]   evol: -11.0%
     doubleForLoop/a=a+b     171.5 [  1.2]     143.1 [ 1.1]   evol: -16.6%
doubleForLoop/a=sin(b*i)     224.6 [  1.6]     207.1 [ 2.9]   evol:  -7.8%
         vectorOfSquares     326.8 [  4.0]     336.5 [ 9.4]   evol:  +2.9%
                  mandel     126.4 [  1.6]     120.7 [ 1.1]   evol:  -4.6%
                     fib     336.2 [  1.1]     335.8 [ 1.1]   evol:  -0.1%
               parse_int    1414.1 [ 16.0]    1377.1 [ 24.2]   evol:  -2.6%
               quicksort     632.8 [ 11.3]     622.7 [ 10.9]   evol:  -1.6%
                  pi_sum    8678.9 [ 84.2]    7452.6 [ 27.6]   evol: -14.1%
           rand_mat_stat     315.9 [ 10.8]     309.1 [ 8.5]   evol:  -2.1%
            rand_mat_mul     387.3 [ 20.1]     363.2 [ 20.1]   evol:  -6.2%
                 printfd    2404.7 [ 30.9]    2310.7 [ 5.7]   evol:  -3.9%


This suggests that the additional slowdown between those revision and 
now has nothing to do with the profiler (?).

Any idea about where to look next ?