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Multi-core CPU’s

Multi-core CPU’s. April 9, 2008. Multi-Core at BNL. First purchase of AMD dual-core in 2006 First purchase of Intel multi-core in 2007 dual-core in early 2007 quad-core in late 2007 Motivated to migrate to multi-core power, space issues steep ramp-up for ATLAS.

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Multi-core CPU’s

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  1. Multi-core CPU’s April 9, 2008

  2. Multi-Core at BNL • First purchase of AMD dual-core in 2006 • First purchase of Intel multi-core in 2007 • dual-core in early 2007 • quad-core in late 2007 • Motivated to migrate to multi-core • power, space issues • steep ramp-up for ATLAS

  3. Expected Computing Capacity Evolution

  4. Recent SI2K Results

  5. Evolution of Space Usage Intel dual and quad-core deployed Capacity of current data center

  6. Evolution of Power Usage Existing UPS Capacity

  7. CPU SpecInt2000 Gain (%) ATLAS script (secs.) Gain (%) SpecRate ATLAS rate test (secs.) Xeon 3.4 GHz 1409 (2 cores) -- 7738 -- 29.6 7891 Opteron 265 (1.8 GHz) 1169 (4 cores) -17.0 7889 -2.0 44.7 8006 Xeon 5150 (2.6 GHz) 2531 (4 cores) 116.5 4968 37.0 101 5145 Xeon 5335 (2.0 GHz) 1996 (8 cores) -21.1 6525 -31.3 148 7024 Xeon 5440 (2.8 GHz) 2862 (8 cores) 43.4 4121 36.8 212 4723 CPU SpecInt2000 Gain (%) PHENIX/ STAR apps (secs.) Gain (%) SpecRate PHENIX/ STAR apps (secs.) Opteron 265 (1.8 GHz) 1169 (4 cores) -- 36838/9743 -- 44.7 /13726 Xeon 5345 (2.0 GHz) 2266 (8 cores) 93.8 23264/6155 36.8/36.8 164 24309/8521 Xeon 5430 (2.6 GHz) 2730 (8 cores) 20.5 17570/5243 24.5/14.8 199 18444*/7068 Benchmark Comparison

  8. Multi-Core & Facility Operations • Migration to multi-core has many advantages • physical consolidation • performance gains • virtualization • And also some disadvantages • more complicated facility operations • cost of licensed software • network/memory requirements

  9. Condor configuration for ATLAS

  10. Virtualization

  11. Near-Term Developments • 1st purchase of Intel quad-core Harpertown (5400 series) soon at the RACF • AMD Barcelona quad-core available now (1 year late – competitive with Intel Clovertown) • Incremental improvements to Harpertown in 2008 • Intel Nehalem (next-generation chip on 45 nm technology) available 2nd-half of 2008 – 1- 8 (or more) cores/cpu • More info available by SC-08 in Austin (Nov. 08)

  12. Summary • Significant SI2K/Watt gains with multi-core • Performance improvements not linear with core count • ATLAS/RHIC benchmark test results generally differ somewhat from SI2K • Increasing network bandwidth requirements for multi-core (gigE line rate for 8 cores/server) • Other challenges ahead with multi-core cpu’s

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