For our codes (numerical weather and climate models) the Intel
compiler's P4 specific optimizations have a large benefit.
Time per simulated day on Intel P4 processor
Options Time (s)
ifc -O2 319 Intel compiler
ifc -O2 -tpp6 -xK 299 P3 specific options
ifc -O2 -tpp7 -xW 213 P4 specific options
Another model
ifc -O2 667
ifc -O2 -tpp6 -xK 504
ifc -O2 -tpp7 -xW 452
Both these codes have a vector machine heritage and so don't make the
best possible use of the processor cache.
Martin Dix
On Thu, 2004-01-22 at 09:27, Peter Shenkin wrote:
I wonder if anyone out there has any experience they can
share about specific P4 and/or Opteron optimizations of
Linux x86 codes.
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