[Beowulf] AMD64 results...

[Markus Baumgartner]

Bill Broadley wrote:
 >
 > The strange thing is they are 32 bit binaries, despite being built
 > on a 64 bit os on a 64 bit hardware.
 >
 > I played around with various mentioned optimizations (including -xW)
 > on the manpage, I never managed a 64 bit binary with icc-8.1 though.
 > The man page has numerous i32em and em64t references.

You probably need to download the EM64T edition of the Intel compiler 
8.1. It is called l_cce_pc_8.1.xxx. (Note the "e" in the filename). 
There are also versions l_cc_... that do not create code for EM64T.

$ file stream_d
stream_d: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for 
GNU/Linux 2.4.0, dynamically linked (uses shared libs), not stripped

This is what I get on my dual Opteron 1.6 GHz workstation (using Gentoo 
Linux, icc -O3):

Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:        1769.1100       0.2923       0.2894       0.3154
Scale:       1695.7910       0.3021       0.3019       0.3023
Add:         1646.2104       0.4668       0.4665       0.4670
Triad:       1793.2239       0.4286       0.4283       0.4294

Markus

--
Markus Baumgartner
Institute of Graphics and Parallel Processing, JKU Linz, Austria
www.gup.uni-linz.ac.at