Re: Re: Re: 64-bit pentium

*To*: mathgroup at smc.vnet.net*Subject*: [mg54307] Re: [mg54272] Re: [mg54186] Re: [mg54090] 64-bit pentium*From*: Jeff Bryant <jeffb at wolfram.com>*Date*: Wed, 16 Feb 2005 14:36:48 -0500 (EST)*References*: <200502100746.CAA16613@smc.vnet.net> <200502120659.BAA21864@smc.vnet.net> <200502150438.XAA29734@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

For added clarification I wanted to add to my comments. EMT64 is supported for Linux only since there is no officially shipping version of Windows 64 available for x86 (64-bit). We are investigating support for Windows 64-bit for a future version, sometime after that OS is officially released. Specific details of Linux support for x86 (64-bit) processors and for all other hardware can be seen here: http://www.wolfram.com/products/mathematica/platforms.html -Jeff ------------ Jeff Bryant Wolfram Research, Inc. Jeff Bryant wrote: > I apologize ahead for the length of this response, but there are > several technical details that require explanation. > > Starting with Mathematica 5.1, the EMT64 system is supported as with > all other x86 (64-bit) processors including the Opteron and Athlon64. > The EMT64 is Intel's name for their line of x86 (64-bit) processors. > From Mathematica's point of view, there is no difference in these > processors. > > Due to all of the variants of the x86 (64-bit) processor line, it is > easier to encapsulate the entire processor family under one name rather > than listing explicitly every variant of the processor line. For this > reason x86 (64-bit) was chosen since it includes all of these processors. > > The current version of Mathematica is already tuned for the G5 processor > which means that it is capable of taking advantage of most of its > capabilities while still maintaining compatability with older G3 and G4 > processors. In fact, it runs much faster than the same version on > either of those chips. The speed of the G5 has little to do with the > fact that it is a 64-bit chip, but do to the other architectural > improvements surrounding it. For this reason, you can still get the > speed without requiring a 64-bit compiled version. 64-bit typically > gives you the ability to address more memory than a 32-bit application, > not speed, although some operations such as big number arithmetic can > see some speedups from 64-bit optimizations. This is true for all > 64-bit processors in general. > > It is not possible to take advantage of any 64-bit memory addressing > for the G5 since the current version of Mac OS X does not support 64-bit > memory addressing for applications. Apple is working on a new version > of the OS named Tiger that will hopefully introduce 64-bit memory > addressing for user applications, but with the current version of the > OS, there is no way to accomplish this. Tiger OS is not yet shipping, > so we will have to investigate Mathematica for Tiger for a future > version. No release date is available for a Tiger compatible Mathematica. > > Wolfram Research is working closely with Apple Computers to provide > the best possible performance for Mathematica users on Mac OS X. We > currently address all the memory supported by Mac OS X version 10.3 > (Panther), currently 4GB per process. > > Specific questions about platform support can be directed to Technical > Support (support at wolfram.com). > > --------------- > Jeff Bryant > Wolfram Research, Inc. > > Selwyn Hollis wrote: > >>On Feb 10, 2005, at 2:46 AM, Alan wrote: >> >> >> >>>When can we expect a version of Mathematica optimized >>>for this? >>> >>>regards, >>>alan >>> >> >> >> >>Ditto for Macintosh G5. I presume we'll have to wait for Mathematica >>6.0? >> >> >>----- >>Selwyn Hollis >>Applied Symbols >>http://www.appliedsymbols.com

**References**:**64-bit pentium***From:*"Alan" <info@optioncity.REMOVETHIS.net>

**Re: 64-bit pentium***From:*Selwyn Hollis <sh2.7183@earthlink.net>

**Re: Re: 64-bit pentium***From:*Jeff Bryant <jeffb@wolfram.com>