Re: [Boost-users] R: [multi-array] Performance? Difference from GIL or uBLAS?

From: joel falcou (joel.falcou_at_[hidden])
Date: 2008-08-07 14:58:50

> We are *comparing* implementations on the same machine, with the
same
> array, with the same simple access patterns and averaging
the running times
> over 1000 runs. I even toggled which test runs
first or second. IF the L1
> cache misses are an issue, that would
slow *both* down, so multi_array
> must be EVEN WORSE than the
test times showed right?
I wans't speaking of L1 cache miss on this
particuliar test sorry for the inconvenience

> I think the
conclusion is that the pointer based approach has a
> significant
(up to20 times on my system) performance improvement over 
>
base+index approach (at least as implemented by multi_array).
Yes I
came to the same conclusion. I was just pointing the fatc that the
base+pointer is not the only way to do something (see my attachment in my
previous post)

Again sorry for our misandurstanding