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1 Vol. 3 No (Sep. 2010) FPGA CUBE FPGA 1 FPGA CUBE CUBE GPU NVIDIA GeForce GTX280 Cell/B.E. Performance Evaluation of One-dimensional FPGA-cluster CUBE for Stream Applications Masato Yoshimi, 1 Yuri Nishikawa, 2 Hideharu Amano, 2 Mitsunori Miki, 1 Tomoyuki Hiroyasu 1 and Oskar Mencer 3 This paper reports implementation and evaluation of CUBE, which is a multi- FPGA system which can connect 512 FPGAs in a form of a simple one dimensional array. As the system well suits as stream-oriented application platforms, we evaluated its performance by implementing edit distance computation algorithm, which is a typical stream-oriented algorithm. Performances are compared with Cell/B.E., NVIDIA s GeForce GTX280 and a general multi-core microprocessor. The report also discusses performance efficiency, logic consumption and power efficiency with comparison to other multi-core devices. 1. PC FPGA 1) 3) 2008 CUBE FPGA 1 4) CUBE 512 Spartan 3 FPGA FPGA ASIC FPGA BlockRAM 5),6) FPGA CUBE Splash 2 7) PROGRAPE 1) FPGA GPU CUBE FPGA FPGA 1 Doshisha University 2 Keio University 3 Imperial College London 209 c 2010 Information Processing Society of Japan
2 210 FPGA CUBE CUBE Intel Core 2 Quad Q9550 Cell/B.E. GPU 2. CUBE: 512 FPGA cluster CUBE FPGA CUBE 8 4) FPGA FPGA CUBE FPGA Spartan 3 FPGA FPGA FPGA FIFO 1 CUBE CUBE FPGA 2 (1) FPGA FIFO FPGA 100 [MHz] FPGA 6.4 [Gbps] = 100 [MHz] 64 [bit] 1 CUBE Fig. 1 Architecture of CUBE. (2) FPGA 1 CUBE 1 CUBE CUBE(1b): 64 FPGA ) 104 [W] 1,460 [ ] Quad Core Xeon 2.5 [GHz] 359 CPU CUBE(1b) 690
3 211 FPGA CUBE 2 Fig. 2 Overview of the algorithm ) 2 2 write weight 2 stra (1) (2) (3) strb c lena lenb c (lena +1) (lenb +1) c(i, j) 3 c(i 1,j 1) c(i, j 1) c(i 1,j) (1) c(i, 0) c(0,j) i j (2) stra i strb j 0 1 a (3) c(i 1,j 1) + a c(i, j 1) + 1 c(i 1,j)+1 c(i, j) (2) (3) c(lena, lenb) 2 3 Fig. 3 Overview of the parallel algorithm B(i, j) stra i strb j p(i, j 1) q(i 1,j) a(i 1,j 1) 5 p(i, j) q(i, j) a(i, j) 3 4. CUBE FPGA Splash 2 7) PROGRAPE 1) FPGA BEE2 9) Splash 2 CUBE Splash 2 16
4 212 FPGA CUBE FPGA 36 FPGA Splash CRAY ) Cell/B.E. GPU 10),11) DP: Dynamic Programming DP 12),13) FPGA 14) Cell/B.E ) GPU O(lenA lenb) w O( lena/w lenb) Cell/B.E. SPE 128 SPE 128 FPGA PE FPGA Splash 2 CUBE FPGA CUBE CUBE FPGA 4 1 FPGA CUBE FPGA FPGA FPGA FPGA FPGA 2 4 CUBE Fig. 4 Computational operation and dataflow on CUBE.
5 213 FPGA CUBE 5.2 FPGA 3.2 FPGA PE 1 CUBE 4 4 FPGA FPGA FPGA PE0 strb 0 stra 0 stra 3 PE1 FPGA i CUBE FPGA p(i, j) a(i, j) FPGA strb i FPGA 1 FPGA FPGA FPGA FPGA FPGA FPGA stra i CUBE FPGA FPGA stra i p i FPGA a (i,j) stra p i FPGA FPGA FPGA FPGA q (3,3) p (3,j) q (i,3) 5.3 FPGA FPGA LD thread 5 FPGA 8 16 LD unit 128 = CUBE 5 Fig. 5 Block computation modules for obtaining edit distance. FPGA 100 MHz 512 FPGA FPGA 64 k LD unit 8 3 LD unit LD unit CUBE 100 [MHz] (1) (2) (3) (4) 4 p q LD unit IPC IPC u =64/83 = 0.77 [Operation/Clock] IPC u LD unit 1 IPC t LD thread IPC LD thread 16 LD unit LD thread LD unit
6 214 FPGA CUBE LD unit stra strb 8 p q p q LD thread 83 3 LD thread LD thread LD unit LD unit LD thread 15 LD unit 16 LD unit 1 LD thread 128 LD thread IPC t (1) IPC t =6.368 ( ) IPC t = ( ) 128 [ ] 128 [ ] = 83 [Clock/Block] 31 [ ] = [Operation/Clock] (1) IPC u = 6.368/ Verilog-HDL Xilinx ISE10.1i CUBE Spartan 3 XC3S FG676 FPGA FPGA LD thread p- q- Spartan 3 BlockRAM 1 LD thread CUBE 6.2 CUBE FPGA 100 [MHz] 1 Table 1 Logic utilization and maximum operating frequency. LD thread LD unit XC3S4000 Slices 22,483 1,340 27,648 FFs 17,985 1,063 55,296 LUTs 42,369 2,496 55,296 BRAMs Freq. [MHz] FPGA 128 2,573 = 83 [Clock/BlockCycle] 31 [BlockCycle] 644 [Byte] 82 FPGA 4 PE p- 512 [Byte] = [Byte] stra 128 [Byte] = 128 FPGA 128 2, = 2,655 CUBE n n 1 n k n =1,024 (2 MaxBlock 1) ( n/maxblock ) 2 =(2n 1) 4= ( ) 4 = 4,092 CUBE PC CUBE 2, [Byte] = stra strb 1,024 [Byte] = [Byte] p- q- PC-CUBE I/O [Mbps] ((1, ) [Byte] 8)/2,655 [ClockCycle] 100 [MHz] PC CUBE CUBE strb 2, [Byte] PC-CUBE [Mbpz] 4
7 215 FPGA CUBE Table 2 2 pthread Execution environment of pthread program. CPU RAM OS Compiler Intel Core 2 Quad 2.83 GHz 8.0 GByte GNU/Linux amd64 gcc-4.1.3(-o3 -lpthread) (1) CUBE 3 (a) Spartan 3 (b) 1 CUBE CUBE(1b) (c) 8 CUBE CUBE CUBE(8b) 100 MHz RTL ( 2 ) Intel Core 2 Quad Q ( 3 ) Sony ZEGO 16) Cell/B.E. ZEGO 7 SPE Cell/B.E. Cell Challenge 2009 C 3 pthread 7 SPE SPE SIMD ( 4 ) NVIDIA GeForce GTX280 GPU GPU Challenge PC PC 3 pthread C 2 (1) 1 (2) Fig. 6 Impact of multithreading and block size on computational time k 5 T2 1 T1 16 k 8 T Core 2 Quad 4k 4k 7 O(N 2 ) 4
8 216 FPGA CUBE Fig. 7 7 Impact of multithreading and sequence length on computational time. Fig. 9 9 Performance for computing edit distance. Fig. 8 8 C2Q Cell/B.E. GeForce GTX280 CUBE Comparison of computational time among C2Q, Cell/B.E., GeForce GTX280 and CUBE. 10 CUBE(8b) Fig. 10 Power consumption ratio based on CUBE(8b) (1) CUBE Spartan 3 1 FPGA 2, [MHz] (2) k CUBE(8b) Core2Quad (3) [J] 10 CUBE(8b) [J]
9 217 FPGA CUBE 3 4 Spartan 3 CUBE Table 3 Power consumption of each system. Table 4 Performance comparison between Spartan 3 and CUBE. Vendor Device Power [W] Intel Core2Quad Q Sony ZEGO(BCU-100) Cell/B.E. 330 NVIDIA GeForce GTX Imperial CUBE (8 boards) 832 CUBE(1b) CUBE(8b) 8b/1b 4k k k k M NVIDIA GPU 50 [W] 200 [W] 17) Spartan 3 FPGA Intel Cell/B.E N O(N 2 ) Cell/B.E. Core2Quad Cell/B.E. 300 [Mops] Cell/B.E. SIMD SPE GPU GTX280 SP 240 SP 8 SP 16 KB 7.2 CUBE 6 CUBE CUBE FPGA O(N 2 ) O(N) 1 FPGA CUBE(1b) 8k = CUBE(8b) 64 k = Spartan 3 1 CUBE(1b) CUBE(8b) 4 9 Spartan 3 Core2Quad CUBE FPGA 4 64 FPGA FPGA 256 CUBE(1b) CUBE(8b) FPGA CUBE CUBE
10 218 FPGA CUBE IPC CUBE(8b) FPGA LD thread 128 FPGA 1 64 k IPC (2) 1, ( ) IPC = ( ) ([ A] [ B]) = ([LD thread ] [ ]) (64 1,024) (64 1,024) = = 1, (2) 2,655 1,023 IPC t = 1, /512 IPC u = 1, / (512 16) CUBE(1b) 1 8k 64 k 64 = 8 8 FPGA IPC (3) ( ) IPC = ( ) ([ A] [ B]) = ([LD thread ] [ ] [ ]) = (64 1,024) (64 1,024) 2, = (3) IPC t = /64 LD unit IPC = /(64 16) 4 CUBE(8b) IPC CUBE(1b) CUBE 2 1 FPGA 2 IPC 4 FPGA LD unit FPGA LD unit FPGA IPC FPGA CUBE LD thread 16 LD unit 31 1 IPC LD thread IPC 256 LD unit = 1, i =120 LD unit i= LD unit i i=1 =120 LD unit LD unit IPC t (4) IPC u = 9.994/16 LD unit IPC ( ) IPC t = ( ) = 256 [ ] 256 [ ] 83 [Clock/Block] 79 [BlockCycle] = [Operation/Clock] (4) IPC t (1) 1.56 = /6.368 CUBE LD thread 1 BlockRAM = 72/ CUBE stra strb FPGA FPGA CUBE 10 CUBE
11 219 FPGA CUBE 8. 1 FPGA CUBE CUBE FPGA x86 GPU Cell/B.E. CUBE CUBE CUBE 1) Hamada, T., Fukushige, T., Kawai, A. and Makino, J.: PROGRAPE-1: A Programmable, Multi-Purpose Computer for Many-Body Simulations, Publications of the Astronomical Society of Japan, Vol.52, pp (2000). 2) Burke, D., Wawrzynek, J., Asanovic, K., Krasnov, A., Schultz, A., Gibeling, G. and Droz, P.Y.: RAMP Blue: Implementation of a Multicore 1008 Processor FPGA System, Proc. 4th Annual Reconfigurable Systems Summer Institute (RSSI 08 ) (2008). 3) Osana, Y., Fukushima, T., Yoshimi, M. and Amano, H.: An FPGA-Based Acceleration Method for Metabolic Simulation, IEICE Trans. Inf. Syst., Vol.E87-D, No.8, pp (2004). 4) Mencer, O., Tsoi, K.H., Craimer, S., Todman, T., Luk, W., Wong, M.Y. and Leong, P.H.W.: CUBE: A 512-FPGA CLUSTER, Proc. IEEE Southern Programmable Logic Conference (2009). 5) Yoshimi, M., Nishikawa, Y., Osana, Y., Funahiashi, A., Hiroi, N., Shibata, Y., Yamada, H., Kitano, H. and Amano, H.: Practical Implementation of a Network- Based Stochastic Biochemical Simulation System on an FPGA, The 18th International Conference on Field Programmable Logic and Applications (FPL 08 ), pp (2008). 6) Morishita, H., Osana, Y., Fujita, N. and Amano, H.: Exploiting Memory Hierarchy for a Computational Fluid Dynamics Accelerator on FPGAs, Proc. Field Programmable Technology 2008 (FPT 08 ), pp (2008). 7) Arnold, J.M., Buell, D.A. and Davis, E.G.: Splash 2, SPAA 92: Proc. 4th annual ACM symposium on Parallel algorithms and architectures, New York, NY, USA, pp , ACM (1992). 8) Levenshtein, V.: Binary Codes Capable of Correcting Deletions, Insertions and Reversals, Soviet Physics Doklady, Vol.10, No.8, pp (1966). 9) Chang, C., Wawrzynek, J. and Brodersen, R.W.: BEE2: A High-End Reconfigurable Computing System, IEEE Design and Test of Computers, Vol.22, No.2, pp (2005). 10) Cell Challenge 2009 SACSIS2009 Cell Challenge ) GPU Challenge Cell Challenge 2009 GPU Challenge ) Myers, G.: A fast bit-vector algorithm for approximate string matching based on dynamic programming, J. ACM, Vol.46, No.3, pp (1999). 13) Hyyrö, H.: A bit-vector algorithm for computing Levenshtein and Damerau edit distances, Nordic J. of Computing, Vol.10, No.1, pp (2003). 14) Masuno, S., Maruyama, T., Yamaguchi, Y. and Konagaya, A.: Multiple Sequence Alignment Based on Dynamic Programming Using FPGA, Transaction on Information and Systems, Vol.E90-D, No.12, pp (2007). 15) Cell (2009). 1.pdf 16) SONY: BCU-100 Computing Unit with Cell/B.E. and RSX. Whitepaper.pdf 17) GPU Vol.2009-HPC-121, No.27, pp.1 5 (SWoPP2009) (2009). ( ) ( ) DC1
12 220 FPGA CUBE DC IEEE 9 20 IEEE Ph.D. DIGITAL Systems Maxeler Technologies CEO EPSRC
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