[Wien] Benchmark on opteron - test on a fully loaded computer

[Florent Boucher]

Dear Wien user,
I am doing actually some benchmarks on opteron system.
Here is the configuration of the node:

- bi-opteron 2214 (dualcore à 2.2Ghz, 64 bits, 2*1Mo de cache)
- 4 Go de mémoire DDR2 ECC Reg PC5300 667 Mhz

I did the compilation with the following options :
Intel fortran for EM64T : 9.1.036
FOPT =  -FR -w -mp1 -prec-div -pc80 -pad -ip -O3
R_LIBS = ../SRC_lib/liblapack_lapw.a 
/opt/goto/64/libgoto_opteronp-r1.07.so -lpthread

I got for the official benchmark a CPU time of 215s (OMP_NUM_THREADS=1) 
that seems to me in agreement with what is publish for

AMD-Opteron, single cpu, 2.4 Ghz   196 sec    ifort64 + libgoto_opteron64p-r1.00.so

(we have 2.2 and I use OMP_NUM_THREADS=1)

It is clear the pentium processor have the best performance for single 
CPU test but I think one should care about the behavior on a fully 
loaded computer.

In order to test the saturation of the memory band width on the node 
(that could be the great difference between AMD and Pentium 
architecture), I just did a parallel job on the k-points using the 
official WIEN benchmark. As I have access to 4 cores (2CPUs x 2 cores), 
I just put 4 kpoints into the klist file (one can put 4 times the first 
k-point) and I run
x lapw1 -c -p
with the following options:
USEREMOTE=0
.machines files
1:localhost
1:localhost
1:localhost
1:localhost

The results are very good (efficiency is 91%).
The calculation on 4cores for 4 kpoints took 237s (total CPU used 100%) 
compared to 211s for one kpoint (total CPU used 25%).

This really the type of benchmark we are interested in, when the CPU is 
fully loaded.

*For those who have access to the new pentium processors, will it be 
possible to see how they behave when the node is fully loaded. Do they 
still perform better than AMD ? And what is the efficiency ?*

I will soon have access to a node with 4CPU  AMD (2cores), so I will be 
able to test with 8 k-points at the same time.
I will let you know about the results.
Regard
Florent

PS: I will be really interested by the test on charge on pentium 
architecture and I think such results should be mentioned on the WIEN2K 
page. Also, for the other users, all the compiler options should be 
mentioned precisely



-- 
 -------------------------------------------------------------------------
| Florent BOUCHER                    |                                    |
| Institut des Matériaux Jean Rouxel | Mailto:Florent.Boucher at cnrs-imn.fr |
| 2, rue de la Houssinière           | Phone: (33) 2 40 37 39 24          |
| BP 32229                           | Fax:   (33) 2 40 37 39 95          |
| 44322 NANTES CEDEX 3 (FRANCE)      | http://www.cnrs-imn.fr             |
 -------------------------------------------------------------------------

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://zeus.theochem.tuwien.ac.at/pipermail/wien/attachments/20061020/1be0d6df/attachment.html