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

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

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

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

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

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

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

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

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

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

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

michele michelotto - INFN Padova New processor Xeon 7400. 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

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

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

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

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

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