On 18 Feb 2008, at 23:56, Tom Sightler wrote:

> On Mon, 2008-02-18 at 10:40 -0500, Pedro Espinoza wrote:
>> Hi Listers:
>>
>> The program appended below takes almost 9 minutes on RHEL 5, RHEL5.1,
>> latest RHEL 4, Centos5.1. However, the same program takes 2m 15
>> seconds on OPensuse 10.2 (2.6.18.8 kernel), and on Fedora 8. The box
>> has 4 dual-core xeon processors, and with 8 GB memory.
>
> I was not successful in reproducing your results. You didn't say the
> speed of the processors but dual-core would seem to imply multi-GHz
> so I
> ran on a cross-section of Intel processors based systems with
> RHEL4/RHEL5 distros that I had available. The results were pretty
> consistent. Non dual-core Pentium 4 systems from 3+ years ago
> turned in
> times in the upper end of the two minute range while newer systems
> actually came in slightly under 2 minutes. I even managed to sneak
> in a
> 64-bit RHEL5.1 system and a virtual machine running on VMware ESX for
> good measure. Not sure what you are seeing but maybe some strange
> interaction between the RHEL kernels and your hardware. Perhaps you
> could enlighten us a little more on the hardware itself.
>
> Here are my results:
<start snipping>
>
> Dell D820 Laptop - Core Duo T2500, 2GHz, 1.5GB, CentOS 5.1 32bit
> Dell 2950 - (2)Dual-core Xeon 5130, 2Ghz, 6GB RAM, RHEL 5.1 64bit
> Dell 6850 - (4)Dual-core Xeon, 3Ghz, 16GB RAM, RHEL 4.6 32bit
> IBM HS20 Blade - (2)Pentium4 Xeon 3.06GHz w/HT, 8GB RAM, RHEL 4.6
> 32bit
> Virtual Machine - Dual CPU, 2GB RAM, RHEL 5.1 32bit
<end snipping>

Your systems are up all up to date.

I believe the OP said that fully updated RHEL5/4 were consistent, but
not as "fast" as Fedora 8 or non-updated RHEL4 systems.

I agree with the points made that we don't have enough detail about
the original hardware and OS to make a determination. The answer to my
question about `rpm -qif /usr/include/math.h` would make that clearer.

--
Sam

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