Phytium 64 core cpu preview
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Charles Zhang from Phytium previewed the 64 Core Phytium chip at the 2015 Hot Chips conference. This week, the ARM chip was unveiled with a prototype server at Hot Chips 2016.
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Phytium 64 core cpu preview
- 1. Mars: A 64-core ARMv8 Processor Charles Zhang Phytium Technology Co., Ltd
- 2. Phytium Technology Co., Ltd Statements The following slides are presented to introduce the general features of one of our products, instead of any commitment about it. It is for information purposes only, and may not be incorporated into any contract. It is not suggested to make purchasing decisions accordingly. The development, release, and timing of any features or functionality described here remains at the sole discretion of Phytium. 2
- 3. Phytium Technology Co., Ltd A Brief Introduction of Phytium China corporation, founded in 2012 Guangzhou Tianjin Vision Leading edge CPU and ASIC provider in China Market focuses on chips for Internet & Cloud Computing infrastructure Traditional workload mainframe servers 3
- 4. Phytium Technology Co., Ltd China is a Fast-growing Server Market 4 Company 1Q15 Revenue 1Q15 Market Share (%) 1Q14 Revenue 1Q14 Market Share (%) 1Q15-1Q14 Growth (%) HP 3,191,694,948 23.8 2,890,992,229 25.5 10.4 Dell 2,296,473,026 17.1 2,006,639,006 17.7 14.4 IBM 1,887,939,141 14.1 2,244,631,789 19.8 -15.9 Lenovo 970,254,659 7.2 127,973,470 1.1 658.2 Cisco 890,179,930 6.6 616,620,000 5.4 44.4 Others 4,157,871,704 31.0 3,469,383,444 30.6 19.8 Total 13,394,413,409 100.0 11,356,239,939 100.0 17.9 Company 1Q15 Revenue 1Q15 Market Share (%) 1Q14 Revenue 1Q14 Market Share (%) 1Q15-1Q14 Growth (%) Inspur 332,613,480 21 227,328,256 17 46 Dell 322,063,140 20 246,281,271 19 31 Lenovo 295,914,571 18 80,084,826 6 270 HP 217,487,450 14 167,775,923 13 30 Huawei 197,490,419 12 189,963,266 14 4 Sugon 140,377.091 9 70,705,366 5 99 Others 104,566,737 6 329,549,621 25 -68 Total 1,610,512,888 100.0 1,311,688,529 100.0 23 Source: Gartner (May 2015) China WW
- 5. Phytium Technology Co., Ltd What is Mars for? 5 High performance High volume of memory High bandwidth memory access High bandwidth I/O access Large scale cache coherency maintained Moderate performance High power efficiency High density computing High bandwidth memory access Low cost Mars Earth
- 6. Phytium Technology Co., Ltd Mars Overview Architecture Features 64 Xiaomi cores, ARMv8 compatible Hardware-maintained global cache coherency Panel-based data affinity architecture Mesh topology on chip network 32MB L2 cache 8 Cache & Memory Chips (CMC) 128MB L3 cache 16 DDR3-1600 channels Two 16-lane PCIE3.0 i/f ECC and parity protection on all caches, tags and TLBs 6 Physical • ~180M instances • 2.0GHz@28nm • 120W Performance • Peak：512GFLOPS • Mem BW：204GB/s • I/O BW： 32GB/s panel0 panel1 panel3 panel2 panel4 panel5 panel7 panel6 CMC PCIe PCIe DDR3 DDR3 CMC DDR3 DDR3 CMC DDR3 DDR3 CMC DDR3 DDR3 CMC DDR3 DDR3 CMC DDR3 DDR3 CMC DDR3 DDR3 CMC DDR3 DDR3
- 7. Phytium Technology Co., Ltd Panel Architecture Eight Xiaomi Cores Compatible design with ARMv8 arch license Both AArch32 and AArch64 modes EL0~EL3 supported ASIMD-128 supported Adv. hybrid Branch Prediction 4 fetch/4 decode/4 dispatch Out-of-Order superscalar pipeline Cache Hierarchy Separated L1 ICache and L1 Dcache Shared L2 cache, totally 4MB Directory-based cache coherency maintenance Directory Control Unit (DCU) Routing Cell 7 Xiaomi Xiaomi Xiaomi Xiaomi L2cache Routing Cell DCU DCU Xiaomi Xiaomi Xiaomi Xiaomi L2cache 6000μm 10600μm
- 8. Phytium Technology Co., Ltd8 Xiaomi Core ITLB I CacheBTB DirPre IndPre SRS Loop Detect Instruction Buffer decoderdecoderdecoderdecoder Rename Logic Arch. Reg file Phy. Reg file Dispatch Logic Reorder Buffer SCInt/VT Queue FP/VT Queue LD/ST Queue ALU /BR FMA C/FDI V FMA C/FDI V DTLB D Cache L2 Cache STB & Prefetch Prefetch Debug /Trace /Interrupt /Timer ALU /BR MUL /DIV MUL /DIV MCI/VT Queue
- 9. Phytium Technology Co., Ltd ITLB I CacheBTB DirPre IndPre SRS Loop Detect Instruction Buffer decoderdecoderdecoderdecoder Rename Logic Arch. Reg file Phy. Reg file Dispatch Logic Reorder Buffer SCInt/VT Queue FP/VT Queue LD/ST Queue ALU /BR FMA C/FDI V FMA C/FDI V DTLB D Cache L2 Cache STB & Prefetch Prefetch Debug /Trace /Interrupt /Timer ALU /BR MUL /DIV MUL /DIV MCI/VT Queue 9 Xiaomi Core Front End ITLB I CacheBTB DirPre IndPre SRS Loop Detect Instruction Buffer Prefetch • 32KB L1 instr. Cache • Next line prefetch • Hybrid Branch Predictor • 2048-entry BTB • Direction predict with TAGE predictor • 512-entry indirect predictor • 48-entry Speculative Return Stack • Four instructions fetched per cycle • 32-entry instruction buffer • Loop detect and Instr. Cache bypass
- 10. Phytium Technology Co., Ltd ITLB I CacheBTB DirPre IndPre SRS Loop Detect Instruction Buffer decoderdecoderdecoderdecoder Rename Logic Arch. Reg file Phy. Reg file Dispatch Logic Reorder Buffer SCInt/VT Queue FP/VT Queue LD/ST Queue ALU /BR FMA C/FDI V FMA C/FDI V DTLB D Cache L2 Cache STB & Prefetch Prefetch Debug /Trace /Interrupt /Timer ALU /BR MUL /DIV MUL /DIV MCI/VT Queue 10 Xiaomi Core Decode, Rename & Dispatch • Up to four instructions decoded per cycle • 192 physical registers • Up to four instructions renamed per cycle decoderdecoderdecoderdecoder Rename Logic Arch. Reg file Phy. Reg file Dispatch Logic Reorder Buffer • Up to four instructions dispatched per cycle • Reorder buffer can hold 160 instructions, and about 210+ instructions can be in-flight in the whole pipeline. • Dispatch in-order, execution out-of-order, retirement in-order.
- 11. Phytium Technology Co., Ltd ITLB I CacheBTB DirPre IndPre SRS Loop Detect Instruction Buffer decoderdecoderdecoderdecoder Rename Logic Arch. Reg file Phy. Reg file Dispatch Logic Reorder Buffer SCInt/VT Queue FP/VT Queue LD/ST Queue ALU /BR FMA C/FDI V FMA C/FDI V DTLB D Cache L2 Cache STB & Prefetch Prefetch Debug /Trace /Interrupt /Timer ALU /BR MUL /DIV MUL /DIV MCI/VT Queue 11 Xiaomi Core Function Units • Two separated 16-entry integer and ASIMD queues shared by four integer units • Two integer unit can process single-cycle integer instructions and integer SIMD instructions, one can also process branch instructions. • Two integer units can process multi-cycle integer instructions and integer SIMD instructions. • One shared16-entry floating point and ASIMD queue • Two FP/ASIMD units equipped, which can be combined into one lockstep ASIMD unit. • FMA supported in both units. • FMUL: 3cycles, FADD: 3cycles, FMA: 6cycles SCInt/VT Queue FP/VT Queue ALU /BR FMA C/FDI V FMA C/FDI V ALU /BR MUL /DIV MUL /DIV MCI/VT Queue
- 12. Phytium Technology Co., Ltd ITLB I CacheBTB DirPre IndPre SRS Loop Detect Instruction Buffer decoderdecoderdecoderdecoder Rename Logic Arch. Reg file Phy. Reg file Dispatch Logic Reorder Buffer SCInt/VT Queue FP/VT Queue LD/ST Queue ALU /BR FMA C/FDI V FMA C/FDI V DTLB D Cache L2 Cache STB & Prefetch Prefetch Debug /Trace /Interrupt /Timer ALU /BR MUL /DIV MUL /DIV MCI/VT Queue 12 Xiaomi Core Function Units • One 24-entry load/store queue • 32KB L1 data cache • 6 outstanding loads • 4 cycles latency from load to use • Next line and stride detected data prefetch • Streamlined pattern auto detected LD/ST Queue DTLB D Cache STB & Prefetch
- 13. Phytium Technology Co., Ltd Cache coherence protocol Hawk cache coherence protocol Distributed directory-based global cache coherency MOESI-like packet-based coherence protocol A home node DCU(directory control unit) supports Affinitive pairing of L2Cs and CMCs “Infinite” capacity for non-conflicting Reads & Writes Optimized transaction flow for exclusive atomic accesses Reduced latency by cacheline forwarding 13 L2C L2C L2C Hawk L3C & Memory I/O Interconnects Global Exclusive Monitor Core0 Core7 Coherence Logic PanelN MEM Core0 Core7 Coherence Logic Panel0 Local Monitor
- 14. Phytium Technology Co., Ltd Network on Chip 2D Concentrated Mesh Architecture Cell based switch with 6 bidirectional ports Uniform package format for each port, a port can be configured to be connected with a device or cascade cell 4 physical channels for CC and 1 channel for debug, DOR Y-X routing Low latency: 3 cycles for each hop High bandwidth: 384GB/s each cell Cell 1 5 3 0 2 4 L2cache L2cache MIU/IOU MIU or Cascade Dest. Lat. (cycles) 0 3 1 6 2 9 3 12 4 15 5 12 6 9 7 6 Avg. 9 3 4 Cell0 1 5 3 0 2 4 Cell1 0 2 4 1 5 3 Cell4 5 1 3 2 0 4 Cell5 2 0 4 5 1 3 Cell7 5 1 3 2 0 4 Cell2 0 2 4 1 5 3Cell3 1 5 3 0 2 4 Cell6 2 0 4 5 1 3 master 0 1 2 56 7 14
- 15. Phytium Technology Co., Ltd Cache & Memory Chip L3 cache 16MB Data Array 2MB Data ECC DDR bandwidth 2 x DDR3-800：25.6GB/s Proprietary interface between Mars & CMC Parallel interface Needs more pins, but lower latency than serdes Separate write/cmd and read data channel L3 Bank0 Mars Interface L3 Bank1 L3 Bank2 L3 Bank3 Mem Ctrl0 Mem Ctrl1 D D R D D R 15 Effective read channel bandwidth：12.8GB/s Effective write/cmd channel bandwidth：6.4GB/s
- 16. Phytium Technology Co., Ltd Latency of affinitive access Memory access latency(ns) Local L1 cache hit ~2 Local L2 cache hit ~8 Affinitive L2 cache hit ~20 Affinitive L3 cache hit ~36 Affinitive DDR access ~70 • Panel : 2.0GHz • NoC: 2.0GHz • CMC: 1.5GHz * PCB latency not considered 16 Xiaomi Xiaomi Xiaomi Xiaomi L2cache Routing Cell DCU DCU Xiaomi Xiaomi Xiaomi Xiaomi L2cache Xiaomi Xiaomi Xiaomi Xiaomi L2cache Routing Cell DCU DCU Xiaomi Xiaomi Xiaomi Xiaomi L2cache CMC
- 17. Phytium Technology Co., Ltd Memory Tune (mTune) Rich Data Collection Number of cache hits/misses for L1/L2/L3 Workload of cache pipelines Busyness of the NoC ECC corrections of the memory system Support Multiple Metrics Average Miss rate/Hit rate Minimal/Maximal/Average Access Latency Bandwidth Analysis Concurrent Average Memory Access Time (CAMAT) Support MPI/OpenMP Applications Thread behavior analysis Inter-process behavior analysis 17
- 18. Phytium Technology Co., Ltd Scalable Debug System ARMv8 CoreSight Compatible debug system Scalable dedicated debug network across 64 cores Distributed debug components Configurable events broadcast scope Timestamp broadcasts with single signal to simplify implementation 18 Cell0 DNB_C DNB_C 1 5 3 0 DNB_M DNB_I 2 4 Cell14 3 1 0 5 2 DNB_C DNB_C DNB_M Cell4 DNB_C DNB_C 5 1 3 2 0 4 DNB_M Cell54 3 5 2 1 0 DNB_C DNB_CDNB_M Cell33 4 0 1 2 5 DNB_C DNB_C DNB_M Cell24 3 1 0 5 2 DNB_C DNB_C DNB_M Cell7 DNB_C DNB_C 5 1 3 2 0 4 DNB_M Cell64 3 5 2 1 0 DNB_C DNB_CDNB_M panel0 panel1 panel4 panel5 panel3 panel2 panel7 panel6 hdbg JTAG1 JTAG2
- 19. Phytium Technology Co., Ltd Physical Design 28nm process 0.9v core/1.8v IO 10 metal layers ~180M instances 2.0GHz 120W 640mm2 die size FCBGA ~3000 pins 19 25.38mm 25.2mm
- 20. Phytium Technology Co., Ltd Performance Evaluation SpecCPU2006 20 Single copy of SPEC CPU benchmark 64 copies of SPEC CPU benchmark 19.2 17.8 0 5 10 15 20 25 INT FP SPEC_CPU2006_base 672 585 0 100 200 300 400 500 600 700 800 INT FP SPEC_CPU2006_rate
- 21. Phytium Technology Co., Ltd Performance Evaluation STREAM 21 0 10 20 30 40 50 60 70 80 90 1 2 4 8 16 24 32 40 48 56 64 STREAM triad #cores Bandwidth(GB/s)
- 22. Phytium Technology Co., Ltd Next Generation Scale-up CPU More powerful core Aggressive Branch Predictor Multithreading More aggressive ILP exploitation Wider SIMD More RAS features Higher bandwidth memory access Higher power efficiency 22
- 23. Mars: A 64-core ARMv8 Processor Charles Zhang Charles.zhang@phytium.com.cn