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摘要:
在高性能处理器开发中，准确而快速的性能估算是设计决策和参数选择的基础. 现有工作通过采样算法和RTL的体系结构检查点加速了处理器RTL仿真，使得在数天内测算复杂高性能处理器的SPECCPU等基准测试的性能成为可能. 但是数天的迭代周期仍然过长，性能测算周期仍然有进一步缩短的空间. 在处理器RTL仿真过程中，预热过程的时间占比很大. HyWarm框架的提出是为了加速性能测算过程中的预热过程. HyWarm通过微结构模拟器分析负载预热需求，为每个负载定制预热方案. 对于缓存预热需求较大的负载，HyWarm通过总线协议进行RTL缓存的功能预热；对于RTL全细节仿真，HyWarm利用CPU分簇和LJF调度缩短最大完成时间. HyWarm相较于现有最好的RTL采样仿真方法，在与基准方法准确率相似的前提下，将仿真完成时间缩短了53%.
Abstract:When developing high-performance processors, accurate and fast performance estimation is the basis for design decisions and parameter exploration. Prior work accelerates processor RTL emulation through workload sampling and architectural checkpoints for RTL, which makes it possible to estimate the performance of benchmarks such as SPECCPU running on complex high-performance processors within a few days. However, waiting a few days for performance results is still too long for architecture iteration, and there is still room for further shortening the performance measurement cycle. During RTL emulation of processors, the warm up phase consumes a significant amount of time. As a solution to expedite the warm up phase during performance evaluation, the HyWarm framework is developed. HyWarm analyzes the warm up demand of workloads with the micro-architectural simulator, and adaptively customizes the warm up scheme for each workload. For workloads with high warm up demand on caches, HyWarm performs functional warm up through the caches’ bus protocol on RTL. For detailed emulation part, HyWarm utilizes CPU clustering and LJF scheduling to reduce the maximum completion time. Compared with the best existing sampling-based RTL emulation method, HyWarm reduces the emulation completion time by 53% under the premise of similar accuracy to the baseline method.
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图 2 来自SPECCPU® 2006的492个检查点的仿真时间分布
Figure 2. Emulation time distribution of 492 checkpoints from SPECCPU® 2006
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图 3 HyWarm的优化概览：将现存固定预热长度分为3段
Figure 3. Optimization overview of HyWarm: Existing fixed warm up duration is divided into three segments
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图 7 GEM5模拟器与香山处理器的分支预测器预热需求
Figure 7. Warm up demand of branch predictors in GEM5 simulator and Xiangshan processor
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图 8 开启Verilator多线程对调度策略的影响
Figure 8. Impact of enabling multi-threading in Verilator on scheduling policy
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图 9 不同的调度策略下最大完成时间对比
Figure 9. Comparison of maximum completion time under different scheduling policies.
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图 13 检查点的预热需求（指令数）分布
Figure 13. Distribution of warm up demand (the number of instructions) or checkpoints.
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图 14 GEM5模拟器与香山处理器的预热需求曲线
Figure 14. Warm up demand curve of GEM5 simulator and Xiangshan processor
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图 18 使用自适应预热时53个负载的全细节仿真周期数分布
Figure 18. Distribution of total detailed simulation cycle counts for 53 workloads using adaptive warm up
表 1 在AMD EPYC 7H12 64核服务器上运行不同并行任务数的Verilator的仿真速度
Table 1 Emulation Speed of Verilator with Different Parallelism on AMD EPYC 7H12 Server with 64 Cores
仿真速度/IPS 4线程单任务 4线程16任务 满载性能损失 单任务 2153.13 1189.31 每核 538.28 297.33 45% 
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表 2 常用的RTL性能评估方法对比
Table 2 Comparison of Commonly Used RTL Performance Evaluation Methods
RTL性能评估方法 仿真频率 典型价格/CNY 是否可租用 典型可容纳设计 RTL软件仿真器 ⩽1kHz 5−10万 是 可容纳商业级SoC 公有云FPGA \leqslant 100MHz 每天240−3600 是 Boom处理器 私有FPGA \leqslant 100MHz \leqslant 40万 否 香山处理器 硬件仿真加速器 \leqslant 1MHz >1000万 否 可容纳商业级SoC
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表 3 服务器低负载时Verilator仿真的多线程扩展效率对比
Table 3 Comparison of Multi-threading Scaling Efficiency of Verilator Emulation When Server Load is Low
线程数量 1 4 8 16 每核 IPS 190.82 538.28 450.94 321.27
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表 4 服务器满载时Verilator仿真的多线程扩展效率对比
Table 4 Comparison of Multi-threading Scaling Efficiency of Verilator Emulation When Server is Fully Loaded
线程数量 4 8 16 每核IPS 297.33 389.27 335.50
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表 5 微结构配置
Table 5 Microarchitectural Configuration
部件 配置 分支预测器 16KB TAGE-SC + ITTAGE + RAS + 4KB BTB 一级数据缓存 128KB, 8路数据缓存 一级指令缓存 128KB, 8路指令缓存 二级缓存 1MB 8路 非包含 三级缓存 6MB 6路 非包含 一级指令TLB 40项 一级数据TLB 136（128 × 4k页 + 8 × 2M页） 二级TLB 2K项 取指宽度 每周期8×4B指令 译码重命名宽度 每周期6条指令 ROB/LQ/SQ 256/80/64 物理寄存器堆 192整数；192浮点 执行单元 Int: 4×ALU, 2×MDU, 1×Misc
Mem: 2×Ld AGU, 2×St AGU
Float: 4×FMA, 2×Misc
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表 6 预热配置
Table 6 Warm up Configurations
方案 功能预热的
M条指令数全细节预热的
M条指令数性能测量的
M条指令数0+100 100 5 0+50 50 5 0+25 20 5 0+10 10 5 0+5 5 5 Ada 100−DW 自适应（DW） 5 FixedFW
（95+5）95 5 5
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表 7 不同功能预热方案的总仿真时长对比 h
Table 7 Comparison of Total Simulation Time for Different Functional Warm up Schemes
子项 0+5 0+10 0+25 FixedFW （95+5） Ada GemsFDTD 0.37 0.55 1.04 0.42 0.29 astar.bi 0.57 0.91 1.65 0.58 0.64 astar.ri 0.69 0.95 1.97 0.66 0.79 bwaves 0.57 0.92 1.68 0.60 0.43 bzip2.chi 0.30 0.43 0.81 0.30 0.22 bzip2.com 1.00 1.52 2.71 1.01 0.72 bzip2.htm 0.30 0.43 0.92 0.34 0.31 bzip2.lib 0.30 0.42 0.89 0.30 0.21 bzip2.pro 1.01 1.60 3.19 0.98 0.68 bzip2.sou 0.95 1.49 2.92 1.08 0.96 cactusADM 0.41 0.60 1.35 0.47 0.32 calculix 0.35 0.60 1.12 0.36 0.26 dealII 0.33 0.51 1.10 0.40 1.20 gamess.cy 0.33 0.49 1.00 0.36 3.46 gamess.gra 0.35 0.51 1.06 0.38 1.09 gamess.tri 0.33 0.50 0.92 0.34 1.10 gcc.166 0.42 0.61 1.33 0.48 1.34 gcc.200 0.90 1.17 2.72 0.89 0.71 gcc.cpde 0.54 0.86 1.63 0.62 1.75 gcc.expr2 0.58 0.86 1.76 0.63 1.03 gcc.expr 0.63 0.89 1.75 0.61 0.70 gcc.g23 0.55 0.76 1.54 0.66 0.43 gcc.s04 0.57 0.93 1.66 0.67 0.69 gcc.scil 0.90 1.10 2.34 0.94 2.48 gcc.type 0.92 1.44 2.62 0.91 1.57 gobmk.13x 0.94 1.51 3.08 0.99 1.66 gobmk.nn 0.85 1.28 2.61 0.92 0.61 gobmk.sco 0.97 1.34 2.70 0.98 0.66 gobmk.tr 0.95 1.30 2.63 0.87 0.98 gobmk.tr 0.71 1.07 2.26 0.73 1.17 gromacs 0.72 1.00 2.25 0.72 0.48 h264ref.f 0.44 0.58 1.21 0.47 0.45 h264ref.s 0.38 0.50 1.04 0.38 2.23 hmmer.nph 0.77 1.25 2.52 0.85 1.45 hmmer.re 0.80 1.21 2.43 0.92 0.79 lbm 0.67 1.02 2.08 0.74 0.57 leslie3d 0.51 0.78 1.43 0.51 0.35 libquantum 0.56 0.78 1.55 0.98 0.39 mcf 3.14 4.18 9.35 3.34 2.32 milc 0.42 0.59 1.26 0.46 0.34 namd 0.52 0.77 1.38 0.48 0.31 omnetpp 1.08 1.66 3.19 1.27 1.06 perl.che 0.46 0.68 1.29 0.47 0.83 perl.di 0.55 0.83 1.37 0.52 1.56 perl.spli 0.43 0.66 1.31 0.43 0.32 povray 0.55 0.88 1.65 0.54 5.39 sjeng 0.72 1.05 2.00 0.67 2.14 soplex.p 1.15 1.59 3.57 1.36 0.87 soplex.r 1.11 1.70 3.05 1.14 0.71 sphinx3 0.46 0.72 1.33 0.59 1.49 tonto 0.37 0.55 1.19 0.41 0.48 xalancbmk 0.89 1.42 2.56 1.17 1.03 zeusmp 0.51 0.75 1.53 0.58 0.39 总计 35.8 52.7 105.5 38.5 54.4 注：黑体数字表示mcf是25M全细节预热下的时间最长的子项，而povray是Ada配置下的时间最长子项.
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表 8 不同方案准确率对比
Table 8 Accuracy Comparison of Different Schemes
% 方案 CPI 分支MPKI L1MP Ada 99.6 91.6 95.1 0+50 99.8 98.9 97.5 0+25 99.7 94.1 91.3 0+10 99.1 85.2 82.8
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表 9 WarmProfiler的分支MPKI预测误差（增高）
Table 9 Branch MPKI Prediction Error Caused by WarmProfiler （increase）
子项 完美预测
MPKIMPKI
增高MPKI
增高百分比/%gcc_expr2 0.443 0.177 39.9 gcc_g23 0.973 0.172 17.7 tonto 0.506 0.117 23.1 gamess_g 0.430 0.112 26.1 gcc_scilab 7.687 0.090 1.2 xalancbmk 2.003 0.079 3.9 gcc_s04 0.163 0.070 42.8 perl_di 0.669 0.066 9.8 h264ref_f 0.042 0.064 151.9 astar_rivers 3.422 0.053 1.6 注：计算MPKI误差的方法是用WarmProfiler指导预热所得的MPKI减去用RTL的真实预热需求进行预热所得到的MPKI. 黑体数字标识出了MPKI误差超过0.1的子项.
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表 10 簇的数量对调度均衡度的影响
Table 10 Impact of Cluster Count on Scheduling Balance
调度均衡度 随机调度 LJF调度 4 簇 × 16核 0.93 0.99 8 簇 × 8核 0.76 0.98 16 簇 × 4核 0.54 0.63
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表 11 LJF调度与随机调度的仿真时间对比
Table 11 Comparison of Simulation Time Between LJF Scheduling and Random Scheduling
仿真 随机调度/h LJF调度/h 提升率/% Ada，8核×8簇 8.71 6.91 20.61 Ada，8核×16簇 6.25 5.38 13.89 25+5，8核×8簇 15.98 13.54 15.26 25+5，8核×16簇 11.29 9.35 17.23 注：Ada结合LJF调度是HyWarm提出的方案；25+5结合随机调度是基线方案.
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表 12 采用模拟器IPC和RTL的真实IPC指导LJF调度的最大完成时间
Table 12 Maximum Completion Time of LJF Scheduling Guided by Simulator IPC and Real IPC of RTL
h Ada仿真 模拟器预测IPC 真实IPC 8核 × 4 簇 13.77 13.67 8核 × 8 簇 6.91 6.92 8核 × 16 簇 5.38 5.38 注：黑体数字标识出8簇下模拟器预测IPC获得了更短的完成时间，这是因为LJF是贪心算法，完成时间的预测误差可能导致更好的调度结果.
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