On Wed, Oct 14, 2015 at 3:40 AM, Antoine Pitrou <solip...@pitrou.net> wrote:
> On Tue, 13 Oct 2015 09:59:05 -0700 > Chris Barker <chris.bar...@noaa.gov> wrote: > > > > So even is SSE2 provides little for Python itself, in the usual case, > we'll > > see performance hits n compiled extensions that are not compiled by > > particularly smart people. > > Since the question is only for 32-bit builds, IS that the case: """ Note that my recently retired computer was 64 bit and had SSE but didn't have SSE2 (I'm fairly sure - CPU was some budget AMD model) """ granted, such machines are probably really really rare, but maybe it does matter for 64 bit, too? > does this even matter? > 32-bit builds on x86 generally bring you poorer performance by > themselves, If a user has a 32 bit machine, they have no choice -- we could argue that anyone for whom performance matters probably isn't running an old, cheap machine, but still... > If you want better performance (or want > to efficiently address 3+GB of RAM, which is an extremely common > situation nowadays), you probably want 64-bit builds. > I thought that wasn't the case (well it certainly is if you want to access that memory), but for raw performance, 64 bit is pushing a lot more memory, in the form of larger pointers, around -- so is sometimes slower. I'm sure it depends on the use-case, as it always does.... Also a note -- I'm lost on the details, but the most recent numpy release required SSE2: """ * Compiling with msvc9 or msvc10 for 32 bit Windows now requires SSE2. This was the easiest fix for what looked to be some miscompiled code when SSE2 was not used. If you need to compile for 32 bit Windows systems without SSE2 support, mingw32 should still work. """ and that's not py3.5 (msvc9 is the py2.7 compiler, and msvc10 is py3.4, yes???) -Chris > > Regards > > Antoine. > _______________________________________________ > Distutils-SIG maillist - Distutils-SIG@python.org > https://mail.python.org/mailman/listinfo/distutils-sig > -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov
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