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Re: AMD CPU - (pentium way faster) [message #29095 is a reply to message #29092]

Thu, 31 January 2002 11:23

Brian Jackel
Messages: 34
Registered: January 1998

Member

Hi Bob

I ran the same tests using IDL 5.4 on three machines here

3) 1.6 Ghz Athlon (512 Mbytes ram)
4) 1.2 Ghz Pentium (1 Gbyte ram)
5) 2 x 600 Mhz Pentium (512 Mbytes ram)

all under Win2000 professional with the latest updates.
Results were obtained by compiling, throwing out the first
few results, then averaging four.

Time_test.pro
3) 0.641
4) 0.683
5) 2.03

Time_test2.pro
3) 1.67
4) 1.80
5) 5.14

So the Athlon is fastest, but not by the clock speed multiplier.
Also, dual processors don't buy you anything when running a
single copy of IDL. Maybe that'll improve with the newer threaded
versions.

Why is Bob's Linux/Athlon combination so slow? Do RSI link to a
particularly bad numerical library? I'd really like to know
what's going on here. My long term plan is to migrate from Windows
to Linux, but I'm not keen on a 50% degredation in effective
processing power.

Brian

Robert Stockwell wrote:
> Ok, here are my current numbers comparing IDLDE 5.5 on:
> 1) 1.4 ghz Athlon 512Mram (Desktop) running Redhat 7.2 Linux
> and the KDE desktop
> 2) 1.13Ghz Pentium III 512Ram (Laptop) running Windows2000 SP2
>
> These were all averaged repeated runs, no "compile time".
>
> Time_test.pro
> 1 (1.4Ghz Athlon) = 0.78 seconds
> 2 (1.1Ghz pentium) = 0.63 seconds
>
> Time_test2.pro
> 1 (1.4Ghz Athlon) = 2.00 seconds
> 2 (1.1Ghz pentium) = 1.64 seconds
>
> Anyone else see speed differences in IDL on windows vs linux,
> or on pentium vs athlon? Or am I anomalous, cause if its just me, I'll
> start looking at the memory I have and other hardware reasons for
> the slow athlon.
>
> Cheers,
> bob

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[Message index]

		Re: AMD CPU - (pentium way faster) By: Richard French on Thu, 31 January 2002 17:01
		Re: AMD CPU - (pentium way faster) By: Mark Hadfield on Thu, 31 January 2002 16:36
		Re: AMD CPU - (pentium way faster) By: Robert Stockwell on Thu, 31 January 2002 15:13
		Re: AMD CPU - (pentium way faster) By: Robert Stockwell on Thu, 31 January 2002 14:19
		Re: AMD CPU - (pentium way faster) By: Mark Hadfield on Thu, 31 January 2002 12:39
		Re: AMD CPU - (pentium way faster) By: Brian Jackel on Thu, 31 January 2002 11:23
		Re: AMD CPU - (pentium way faster) By: Pavel A. Romashkin on Thu, 31 January 2002 09:56
		Re: AMD CPU - (pentium way faster) By: Robert Stockwell on Thu, 31 January 2002 07:47

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