Re: [RFC] 64 bit platform improvements for string length and integer

Unfortunately, my benchmarks on Linux show that 64-bit PHP builds are always a bit slower on real-life applications. It's because 64-bit PHP uses more memory and as result causes more CPU cache misses. Thanks. Dmitry. On Thu, Jan 23, 2014 at 11:23 PM, Pierre Joye <pierre.php@gmail.com> wrote: > On Thu, Jan 23, 2014 at 8:17 PM, Andrea Faulds <ajf@ajf.me> wrote: > > > > > > On 23/01/14 13:12, Dmitry Stogov wrote: > >> > >> It would be a significant performance degradation :) > >> Just imagine how to implement 64-bit multiplication and division on > 32-bit > >> CPU. > > > > > > I doubt as much. Aren't the vast majority of servers 64-bit anyway? And > > those that aren't are probably just 32-bit-mode 64-bit CPU servers, which > > wouldn't be slow, right? > > RIght, 32bit mode are not slower, at least for basic operations, other > ops are slower (couple of more cycles, less registers, etc.). However > 64bit mode combined with 64 binaries can be much faster than 32bit > binary on the same processor. > > > Cheers, > -- > Pierre > > @pierrejoye | http://www.libgd.org >