1. Evaluation of HEP worker nodes Michele Michelotto at pd.infn.it
Gruppo Server
Evaluation of HEP worker nodes
Michele Michelotto at pd.infn.it

2. michele michelotto - INFN Padova
T1 requirements
4/3/2008
michele michelotto - INFN Padova

3. michele michelotto - INFN Padova
T1 + T2 cpu budget - LHC
4/3/2008
michele michelotto - INFN Padova

4. michele michelotto - INFN Padova
SI2K
Computing requirements and computing resources pledged still expressed in term of SI2K
Big confusion. Which SI2K are we talking about?
4/3/2008
michele michelotto - INFN Padova

5. michele michelotto - INFN Padova
Too many SI2K
Take as an example a worker node with two Intel Woodcrest dual core 5160 at 3.06 GHz
SI2K nominal: 2929 – 3089 (min – max)
SI2K sum on 4 cores:
SI2K gcc-low: 5523
SI2K gcc-high: 7034
SI2K gcc-low + 50%: 8284
4/3/2008
michele michelotto - INFN Padova

6. michele michelotto - INFN Padova
Even more
Actually all the gcc results in the previous slide are on i386 (32bit)
if you would like to know how your code is running on 64 bit machine, you can measure Specint INT 2000 with gcc on x86_64.
So the worker node with two Intel Woodcrest dual core 5160 at 3.06 GHz
SI2K nominal: 2929 – 3089 (min – max)
SI2K on 4 cores:
SI2K gcc-low: 6021
SI2K gcc-high: 6409
SI2K gcc-low + 50%: 9031
4/3/2008
michele michelotto - INFN Padova

7. michele michelotto - INFN Padova
Move to SI2006
My presentation at Hepix in Hamburg and St. Louis
Presentation at the LCG MB
LCG MB pushed to Hepix wg to propose quickly a solution, before next Hepix meeting (May 08)
4/3/2008
michele michelotto - INFN Padova

8. michele michelotto - INFN Padova
Working group
Hepix is an organization where HEP Computing Center people meets twice a year (Sprint Europe, Fall USA)
IHEPCCC asked Hepix to form two Working group to study Storage and CPU benchmarking
Real work started at the end of 2007
CPU group chaired by H.Meinhard (CERN)
4/3/2008
michele michelotto - INFN Padova

9. michele michelotto - INFN Padova
WIP
Work in progress
Phone meeting every two weeks
The first core of people from HEPIX (H.Meinhard, Alex Iribarren, Manfred Alef, Peter Wegner, Ian Gable, Martin Bly, Sandy Philcott
From Januanry more people from experiments
Gabriele Benelli (CMS), Franco Brasolin and Alessandro de Salvo (Atlas) + LHCB and Alice
4/3/2008
michele michelotto - INFN Padova

10. michele michelotto - INFN Padova
Lxbench
A set of dedicated machines
Some old Xeon, one AMD275,one AMD 2218, two Woodcrest, only one Clovertown, no Barcelona, non Harpertown
Measures of SPEC
SI2k and Si2006
Int and FP
32 bit and 64 bit
Speed, rate=n_cores, speed in parallel
Measurement of HEP code
Setup phase
Only Atlas (FB+AdS) managed to run on all lxbench cluster
4/3/2008
michele michelotto - INFN Padova

11. michele michelotto - INFN Padova
Atlas
4/3/2008
michele michelotto - INFN Padova

12. michele michelotto - INFN Padova
SPEC rate vs parallel
4/3/2008
michele michelotto - INFN Padova

13. michele michelotto - INFN Padova
More machines
Some machines at DESY
Maybe in RAL
For some time a 2352 Barcelona in INFN-PD
Need a set of dedicated machines in PD
Proposal to CSN5 for HEPMARK experiment
Michelotto, Gianoli, Brasolin, Crescente, Ferrari
Referees L.Luminari, G.Salina
Financ. Req. 2 WN/year
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michele michelotto - INFN Padova

14. michele michelotto - INFN Padova
Power consumption
4/3/2008
michele michelotto - INFN Padova

15. michele michelotto - INFN Padova
HT on or off
Turning off Hyperthreading causes a 10% drop in performance but also a 20% drop in Power consumption
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michele michelotto - INFN Padova

16. michele michelotto - INFN Padova
Intel 54xx
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michele michelotto - INFN Padova

17. michele michelotto - INFN Padova
AMD 4core
4/3/2008
michele michelotto - INFN Padova

18. michele michelotto - INFN Padova
Mem intel vs amd
Who is faster?
It depends on the block size
On the red zones Intel is better.
On the green zone AMD is better
4/3/2008
michele michelotto - INFN Padova