GridKa site report. Manfred Alef, Andreas Heiss, Jos van Wezel. Steinbuch Centre for Computing
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1 GridKa site report Manfred Alef, Andreas Heiss, Jos van Wezel Steinbuch Centre for Computing KIT The cooperation of and Universität Karlsruhe (TH)
2 KIT? SCC? { = University ComputingCentre + Institute for Scientific Computing (FZK) No legal entities so far. Unified legal entities likely in = Grid computing centre, built and operated by SCC 2 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
3 New CPUs: ksi2k (338 boxes): 2x Intel Xeon E5345 (2.33 GHz Clovertown) TYAN-Tempest-i5000PX-S5380 / Supermicro X7DB ksi2k (144 boxes): 2x Intel Xeon E5430 (2.66 GHz Harpertown) D-Grid IBM x3550 8x2 GB RAM (DDR2 FB-DIMM): 2 GB RAM per core 2x 250 GB local disk (system + local homedirectories for LCG jobs) Old CPUs (retired): 348 boxes: 2x Intel Xeon 2.66/3.06 GHz (Nocona) (0.5 GB RAM per core) Sum total: 9520 ksi2k 3 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
4 Some remarks on the CPU procurement procedure at GridKa: Call for tenders is based on the total compute power which is required No fixed number of machines Vendor has to deliver as many nodes as are required to achieve the total amount of compute power Based on SPEC CPU2000 (CINT2000) To be executed in the GridKa environment: OS: Scientific Linux 4.x Compiler: gcc-3.4.x Fixed set of optimization flags Simulation of the batch system: Run as many SPEC runs in parallel as there are cores available Adjudication: The same procedure as every year Purchase price + Estimated cost of electric energy for operation and cooling for 3-4 years. (4 per W max ) + Estimated cost of space and racks (300 EUR per 19 unit) + Network ports, software licenses... (200 EUR per system) 4 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
5 Some remarks on the CPU procurement procedure at GridKa: Experiences: Generally this procedure works quite well. However... (see the next slide) Check tenders very carefully Experiences with next procurement (milestone Oct 2008): Benchmark report (SPEC and power) based on system with 4x4 GB FB-DIMM Tender offered 8x2 GB FB-DIMM Take into account the power consumption of FB-DIMM memory: W per module! Makes a difference of about 50W per box! 5 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
6 Acceptance tests at GridKa: Running SPEC CPU2000 benchmark as an acceptance test: The performance of all WNs, not only samples, has been checked with benchmarks. Bad experiences with one batch of nodes: Expected performance of boxes: SPECint_base2000 (prototype test machine) Offer promises SPECint_base2000 First benchmark results: SPECint_base2000 BIOS upgrade + modification of BIOS settings by vendor: SPECint_base2000, that's an improvement of about 4.5 %! Vendor delivered more machines than purchased for free 6 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
7 Acceptance tests at GridKa: Reproducibility of results: Results of benchmark runs (after the BIOS modifications mentioned above): SPECint_base2000 (0.8 % bandwidth) However, we found poor performance results on some boxes caused by hardware problems, e.g.: OS found only 8 of 16 GB RAM OS found only 4 (or 7) of 8 CPU cores Wrong CPU type in /proc/cpuinfo, e.g., Intel(R) Xeon(R) CPU Q2407 (or 1.33GHz 7 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
8 Acceptance tests at GridKa: Electric power consumption: Power consumption of one batch of machines higher than expected Vendor replaced PSUs by 80plus 1 ones Reduced power consumption around 10% Call for tenders for October milestone finished. Machines will have very low power consumption compared to recent batch! 1) 80plus PSU: >80% efficiency when load >50% 8 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
9 Disk expansion Milstone April 2008: 44 NEC D3-10 controllers 340 SAS/SATA disk enclosures GB SAS disks GB SATA disks dcache pool nodes Move from 80TB per Gbit Ethernet connection to 40TB per Gbit Total disk: 4910 TB 1930 TB ( installations) TB (04/2008) 9 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
10 Disk expansion Addidtional delivery (not yet in production) 14 NEC D3-10 controllers 104 SAS/SATA disk enclosures GB SAS disks GB SATA disks = 917 TB Further details on disk and tape: see talk FZK storage news by Silke Halstenberg on Wednesday! 10 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
11 ? Questions? 11 Andreas Heiss, Manfred Alef, Jos v. Wezel Steinbuch Centre for Computing
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