1. CCR Autunno 2008 Gruppo Server
Michele Michelotto at pd.infn.it

2. michele michelotto - INFN Padova
Quanti SPECINT
SI2K
the nickname for SPEC CPU Int 2000 benchmark
Came after Spec89, Spec Int 92 and Spec Int 95
SI2K CERN
Measured with gcc compiler and “-O2 –fPIC –pthread” optimization
Multiparallel to express machine rate
SI2K LCG
SI2K CERN + 50%
Used to express computing power as seen by WLCG
CCR Oct-08 LNF
michele michelotto - INFN Padova

3. michele michelotto - INFN Padova
Quanti SPECINT
SI2006
SPEC pubblishes result only for post 2006 processor
SI2006 rate
SPEC pubblished results running on all cores
SI2006 CERN
SI2006 measured with “gcc –O2 –fPIC –pthread”, multi-parallel
CCR Oct-08 LNF
michele michelotto - INFN Padova

4. michele michelotto - INFN Padova
SPEC rate vs parallel
CCR Oct-08 LNF
michele michelotto - INFN Padova

5. michele michelotto - INFN Padova
FZK Measurement
In 2001 SPEC with gcc was 80% of the average pubblished data
In 2006 the gap was much wider
80%
CCR Oct-08 LNF
michele michelotto - INFN Padova

6. michele michelotto - INFN Padova
Nominal SI vs real SI
FZK uses for tender SI2K with FZK tuning (gcc-high) and add 25% to “normalize” to year 2001
CERN and FZK Proposal to WLCG: use SI2K with CERN tuning (gcc-low) and add 50% to normalize
Run n copies in parallel
Where n is the number of cores in the worker node
To take in account the drop in performance of a multicore machine when fully loaded.
CCR Oct-08 LNF
michele michelotto - INFN Padova

7. michele michelotto - INFN Padova
WLCG SI2K How-to
Run SI2000 with gcc3, 32bit, with CERN flags
gcc –O2 –fPIC –pthread –m32
Run N copies of this SI2000 in parallel as the N number of cores
Sum all the results
Add 50%
This is the SI2K of one machine
Sum over all the machines of your farm
CCR Oct-08 LNF
michele michelotto - INFN Padova

8. michele michelotto - INFN Padova
Exercise
Compute the WLCG official rating of a farm with 224 Dell Blade M1000e 2x5420
Number of cores/server: 8
SI2K gcc-low: 10218
Total SI2K: 2289 kSI2k + 50%:
Total WLCG SI2K: 3433 kSI2k
CCR Oct-08 LNF
michele michelotto - INFN Padova

9. michele michelotto - INFN Padova
Performances
CCR Oct-08 LNF
michele michelotto - INFN Padova

10. michele michelotto - INFN Padova
Price / Perfomances
Bold: 2008
NB: kSI2K LCG  Euro/(kSI2k+50%)
CCR Oct-08 LNF
michele michelotto - INFN Padova

11. michele michelotto - INFN Padova
Best buy
Intel processor give best performance at intermediate clock
AMD processor give best performances at lower clock
Compare with recent Tier2 tender
CCR Oct-08 LNF
michele michelotto - INFN Padova

12. michele michelotto - INFN Padova
New processor
Xeon Last version of Penryn for MP market
The 5400 core in the 7300 market
First six core from Intel
Nehalem DP “Gainestown”
Q4 2008
40% faster in Int, 70% faster in FP, quad core, two thread per core (8 logical cpu), integrated DDR3
5502: 1.86GHz, 4MB(L3), 60W,188$  5570: 2.96GHz, 8MB(L3), 95W, 1386$
Opteron DP “Shangai”
Feb 09
Double L3 caches (6MB) of Barcelona, still DDR2
2372 HE: 2.1GHz, 55W  2386 SE, 2.8GHz, 105W
CCR Oct-08 LNF
michele michelotto - INFN Padova

13. michele michelotto - INFN Padova
HEPIX group
A group with people from the major lab (CERN, FZK, DESY, RAL, INFN, JLAB, TRIUMF) after IHEPCCC request
And people designated from experiments (CMS, ATLAS, ALICE, LHCB)
Several machine
(lxbench cluster) at CERN
Harpertown and Barcelona INFN PD
Harpertown in Desy
CCR Oct-08 LNF
michele michelotto - INFN Padova

14. michele michelotto - INFN Padova
Results
SI2K CERN, SI2006 CERN but also SFP 2006 CERN in good agreements with experiments results
Before July: Internal Agreement to use SI2006 CERN
After July: push to use CPU 2006 CPP in order to have more FP benchmark
About 10% FP like observed with Perfmon on lxbatch at CERN
CCR Oct-08 LNF
michele michelotto - INFN Padova

15. michele michelotto - INFN Padova
SPEC CPP
471.omnetpp
473.astar
483.xalancbmk
444.amd
447.dealII
450.soplex
453.povray
We finally take aritmetic mean of the geometric mean of integer part and geomtric mean of FP part.
It’s wrong! We should take the geometric mean of the 7 tests, but difference is small if int and fp performances are very similar
Integer tests
Floating Point tests
CCR Oct-08 LNF
michele michelotto - INFN Padova

16. michele michelotto - INFN Padova
How to compute CPP
CCR Oct-08 LNF
michele michelotto - INFN Padova

17. michele michelotto - INFN Padova
What’s next?
Make a table of performance of currents processor with the new benchmark
Understand Nehalem wrt multithread
John Gordon group (or Gonzalo Merino?) inside WLCG
CCR Oct-08 LNF
michele michelotto - INFN Padova