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:

Dell D820 Laptop - Core Duo T2500, 2GHz, 1.5GB, CentOS 5.1 32bit
$ time ./sorttest 20
real   1m48.319s
user   1m46.238s
sys   0m1.383s

Dell 2950 - (2)Dual-core Xeon 5130, 2Ghz, 6GB RAM, RHEL 5.1 64bit
$ time ./sorttest 20
real   1m37.970s
user   1m36.486s
sys   0m0.838s

Dell 6850 - (4)Dual-core Xeon, 3Ghz, 16GB RAM, RHEL 4.6 32bit
$ time ./sorttest 20
real   2m30.838s
user   2m29.109s
sys   0m1.687s

IBM HS20 Blade - (2)Pentium4 Xeon 3.06GHz w/HT, 8GB RAM, RHEL 4.6 32bit
$ time ./sorttest 20
real   2m53.267s
user   2m46.145s
sys   0m1.538s

Host - IBM x336 Server - (2)Pentium4 Xeon 3.2GHz w/HT, 8GB RAM, VMware
ESX 3.5
Virtual Machine - Dual CPU, 2GB RAM, RHEL 5.1 32bit
$ time ./sorttest 20
real   2m19.206s
user   2m6.960s
sys   0m8.319s

Later,
Tom

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