>
> And on an experiment in spectral identification that mainly does F64 inner products, I get with the default build
>
> (time (run-experiment-and-graph 5))
> 785617 ms real time
> 785590 ms cpu time (785040 user, 550 system)
> 33 collections accounting for 442 ms real time (350 user, 80 system)
> 3216061748 bytes allocated
> 30338 minor faults
> no major faults
>
> and with the gcc-4.8 build I get
>
>> (time (run-experiment-and-graph 5))
> (time (run-experiment-and-graph 5))
> 739829 ms real time
> 739790 ms cpu time (739620 user, 170 system)
> 33 collections accounting for 292 ms real time (310 user, 0 system)
> 3216060588 bytes allocated
> 17663 minor faults
> no major faults
using -fstrict-aliasing didn’t help the spectral identification code much:
> (time (run-experiment-and-graph 5))
(time (run-experiment-and-graph 5))
733849 ms real time
733750 ms cpu time (733330 user, 420 system)
33 collections accounting for 219 ms real time (210 user, 0 system)
3216086556 bytes allocated
16938 minor faults
no major faults