Author: Carsten Kossendey
Date: 04:08:31 04/24/98
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On April 24, 1998 at 04:12:32, Ernst A. Heinz wrote: >On April 23, 1998 at 16:28:54, Frank E. Oldham wrote: > >>A recent BYTE article discussed the POWER3. I was impressed by the >>aggregate cache and memory bandwidth. For example, the chip has a >>256-bit L2 cache bus (compared to 64-bit for PCs and Macs). > >Most Alpha workstations (even the cheaper AlphaPC mainboards) have >had 256bit buses between their CPUs, the external L2/L3 caches, and >even the main memory *for years*. > >=Ernst= If you look at the STREAM (memory bandwidth) benchmark results (www.cs.virginia.edu/stream), it doesn't seem to help much ;) Here's an excerpt from the list: All results are in MB/s --- 1 MB=10^6 B, *not* 2^20 B ------------------------------------------------------------------ Machine ID ncpus COPY SCALE ADD TRIAD ------------------------------------------------------------------ Cray_T94 1 11341.0 10717.0 14783.0 13920.0 DEC_600au_600 1 227.7 223.0 243.5 248.2 DEC_164LX_533_2MBL3 1 241.5 234.4 267.4 256.0 DEC_164SX_533_2MBL3 1 273.1 256.0 292.6 292.6 IBM-SP_P2SC_120MHz-thin 1 690.6 684.6 787.2 786.8 IBM_RS6000-397 1 778.8 777.5 883.1 882.4 IBM_RS6000-595 1 620.9 650.5 660.7 689.5 IBM_RS6000-591 1 711.1 695.7 750.0 800.0 SGI_Origin_200 1 277.0 277.0 285.0 286.0 Sun_UE_10000 1 164.0 164.0 202.0 202.0 Sun_UE_6001 1 281.0 281.0 224.0 261.0 Sun_Ultra2-2200 1 228.5 227.5 258.9 189.9 Dell_PII_300 1 188.2 173.0 213.3 188.2 HP_Kayak_PII_300 1 175.5 180.7 214.4 188.1 Gateway_2000_P6-200 1 107.9 89.5 100.5 101.6 Micron_P6-200 1 98.4 97.4 106.5 105.0 Apple_Mac_G3_266 1 137.1 128.0 137.1 137.1 ------------------------------------------------------------------ It appears the Power2 SuperChip blows them Alphas (as well as most other processors) by a factor 3 or so. Also take note of that T94 result - other Crays fare similarly good, except for the Alpha-based designs.
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