Re: [Gretl-devel] RNG (was: Can't open datafile)

On Wed, 19 Jan 2011, Riccardo (Jack) Lucchetti wrote: > On Tue, 18 Jan 2011, Allin Cottrell wrote: > > > I've now modified the configure script in CVS, and I think that > > things should now be right for the case where the compiler > > supports sse2 but the CPU does not. That is, you shouldn't have to > > manually --disable-sse2 to get a working binary. > > > > However, I can't check that definitively on my own machine. > > Just crossed my mind: what happens to random number generation on machines > which don't support sse2 (which I assume is the case on non-x86 > architectures)? I have no time to check this right now, but I would assume > we fall back on the old Mersenne Twister. But if this is the case, we'd > have that scripts with the same seed would produce architecture-specific > results. Do we want this? The SFMT doesn't actually require sse2. I think it will just run slower in the absence of sse2, but it's probably worth checking to see if you get the same sequence, for a given seed, with and without sse2.