configs/example/arm/fs_power.py

   1 # Copyright (c) 2017 ARM Limited
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  35 #
  36 # Authors: Andreas Sandberg
  37 #          Stephan Diestelhorst
  38
  39 # This configuration file extends the example ARM big.LITTLE(tm)
  40 # with example power models.
  41
  42 from __future__ import print_function
  43
  44 import argparse
  45 import os
  46
  47 import m5
  48 from m5.objects import MathExprPowerModel, PowerModel
  49
  50 import fs_bigLITTLE as bL
  51
  52
  53 class CpuPowerOn(MathExprPowerModel):
  54     # 2A per IPC, 3pA per cache miss
  55     # and then convert to Watt
  56     dyn = "voltage * (2 * ipc + " \
  57             "3 * 0.000000001 * dcache.overall_misses / sim_seconds)"
  58     st = "4 * temp"
  59
  60 class CpuPowerOff(MathExprPowerModel):
  61     dyn = "0"
  62     st = "0"
  63
  64 class CpuPowerModel(PowerModel):
  65     pm = [
  66         CpuPowerOn(), # ON
  67         CpuPowerOff(), # CLK_GATED
  68         CpuPowerOff(), # SRAM_RETENTION
  69         CpuPowerOff(), # OFF
  70     ]
  71
  72 class L2PowerOn(MathExprPowerModel):
  73     # Example to report l2 Cache overall_accesses
  74     # The estimated power is converted to Watt and will vary based on the size of the cache
  75     dyn = "overall_accesses*0.000018000"
  76     st = "(voltage * 3)/10"
  77
  78 class L2PowerOff(MathExprPowerModel):
  79     dyn = "0"
  80     st = "0"
  81
  82 class L2PowerModel(PowerModel):
  83     # Choose a power model for every power state
  84     pm = [
  85         L2PowerOn(), # ON
  86         L2PowerOff(), # CLK_GATED
  87         L2PowerOff(), # SRAM_RETENTION
  88         L2PowerOff(), # OFF
  89     ]
  90
  91
  92 def main():
  93     parser = argparse.ArgumentParser(
  94         description="Generic ARM big.LITTLE configuration with "\
  95         "example power models")
  96     bL.addOptions(parser)
  97     options = parser.parse_args()
  98
  99     if options.cpu_type != "timing":
 100         m5.fatal("The power example script requires 'timing' CPUs.")
 101
 102     root = bL.build(options)
 103
 104     # Wire up some example power models to the CPUs
 105     for cpu in root.system.descendants():
 106         if not isinstance(cpu, m5.objects.BaseCPU):
 107             continue
 108
 109         cpu.default_p_state = "ON"
 110         cpu.power_model = CpuPowerModel()
 111
 112     # Example power model for the L2 Cache of the bigCluster
 113     for l2 in root.system.bigCluster.l2.descendants():
 114         if not isinstance(l2, m5.objects.Cache):
 115             continue
 116
 117         l2.default_p_state = "ON"
 118         l2.power_model = L2PowerModel()
 119
 120     bL.instantiate(options)
 121
 122     print("*" * 70)
 123     print("WARNING: The power numbers generated by this script are "
 124         "examples. They are not representative of any particular "
 125         "implementation or process.")
 126     print("*" * 70)
 127
 128     # Dumping stats periodically
 129     m5.stats.periodicStatDump(m5.ticks.fromSeconds(0.1E-3))
 130     bL.run()
 131
 132
 133 if __name__ == "__m5_main__":
 134     main()