Re: Performance chart for E420R and modern V480 or T2000


Benjamin Gawert wrote:
* rpasken@xxxxxxxxxxx:

But why the hell are you talking about pure CPU power with a sparc cpu
?
If you want integer cpu power get an ix86 system and if you want
floating point get an itanium.

I am going to assume you are being sarcastic about the itanium

why should that be sarcastic?

as they
are true dogs in terms of performance. Although SPEC benchmarks tell
alot about a systems performance, the only true measure of performance
is a test run with your specific load. Having said that, the loads that
I deal with the Sparc floating point and integer performance is far
better than any of the Intel processors.

Fine. And for the tasks my employee does (mostly numerical simulations)
the Itanium has proven to be the fastest solution when we bought our HP
Superdomes (around between 1-2 years ago). The SPARC numbers were
somewhere in the lower range so that it simply didn't cut it.

Only an AMD Opteron provides
any competition and then only at 3x the clock speed. Running MM5,
HYSPLIT4 and SLU-DRAS is an exercise in patience and frustration with
an x86 processor. Random crashes of the system and programs are what
you can expect from x86.

Only of you choose crap hardware or if you make other mistakes (which
also would lead to a crashing SPARC system). We run shitloads of x64 and
x64 systems at work, most of thenm 24hrs/day and under heavy load, and
we still have to see the "random crashes" you're talking about...

Benjamin

I should have explain what MM5, HYPSLIT4 and SLU-DRAS are. MM5 is a
very fine scale (1km/1min resolution) numerical weather prediction
model It does very little I/O and is very floating point intensive. It
reads raw weather data at the begining of the run and then the only I/O
is when it spits out a specific forecast typically every 30 minutes of
forecast time. HYSPLIT4 is an atmospheric dispersion model. Using MM5
output it computes the concentrations of chemicals as they are
dispersed. It handles chemical transformations as well as dispersion.
SLU-DRAS is a real-time Doppler radar/lidar analysis system. It takes
live multiple Doppler velocity and reflectivity data and converts it
into the 3-D wind field, temperatures and pressures. All three systems
are well documented software packages that run on a wide range of
hardware. Only nuclear bomb testing software is more floating point
intensive.

I used Compaq/HP x86 hardware (ML-350 dual 1.4GHZ P3's)and a Sun (Blade
1000 dual 750GHZ) running both Solaris and Linux for the benchmarks. No
benchmark of any the software ran less than 5 days. Only about half my
benchmarks completed on the compaq hardware due to sig seg violations
at random points in the code. According to dmesg they were associated
with memory errors.

.

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