Re: Re: 64-bit pentium

*To*: mathgroup at smc.vnet.net*Subject*: [mg54272] Re: [mg54186] Re: [mg54090] 64-bit pentium*From*: Jeff Bryant <jeffb at wolfram.com>*Date*: Mon, 14 Feb 2005 23:38:22 -0500 (EST)*References*: <200502100746.CAA16613@smc.vnet.net> <200502120659.BAA21864@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

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

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

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

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