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Re: Sorry Re: which OS is faster for idl? [message #36803 is a reply to message #36797] Fri, 24 October 2003 02:13 Go to previous messageGo to previous message
Pertti Rautiainen is currently offline  Pertti Rautiainen
Messages: 5
Registered: October 2002
Junior Member
R.G. Stockwell <noemail@please.com> wrote:

: A while ago I came to a similar conclusion. A 1.13 ghx win2000 laptop
: was faster than my 1.4 ghz linux AMD.
: There must be compiler optimizations available on the ms platforms
: that are not there on the other platfforms.

Another thing is that IDL seems to better optimized for Intel than for
AMD. Here's the results for time_test3:

P4, 2.2 GHz, 1024 MB RAM, RedHat 9.0 & IDL 6.0
1.95918=Total Time, 0.071304670=Geometric mean, 23 tests.

Athlon TB 1.4 GHz, 512 MB RAM, RedHat 9.0 & IDL 6.0
4.02103=Total Time, 0.13463139=Geometric mean, 23 tests.

When I am running an N-body simulation program in both machines, I get
quite different results: when the code is compiled with g77, the
computers are roughly as fast, when I use Intel's Fortran compiler, P4
is about 40% faster than Athlon. So even with Intel's own compiler, the
difference is far from what time_test3 gives.

Pertti Rautiainen

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