fs_power.py revision 11973:aa43e508ade4 
1# Copyright (c) 2017 ARM Limited
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3#
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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
42import argparse
43import os
44
45import m5
46from m5.objects import MathExprPowerModel, PowerModel
47
48import fs_bigLITTLE as bL
49
50
51class CpuPowerOn(MathExprPowerModel):
52    # 2A per IPC, 3pA per cache miss
53    # and then convert to Watt
54    dyn = "voltage * (2 * ipc + " \
55            "3 * 0.000000001 * dcache.overall_misses / sim_seconds)"
56    st = "4 * temp"
57
58class CpuPowerOff(MathExprPowerModel):
59    dyn = "0"
60    st = "0"
61
62class CpuPowerModel(PowerModel):
63    pm = [
64        CpuPowerOn(), # ON
65        CpuPowerOff(), # CLK_GATED
66        CpuPowerOff(), # SRAM_RETENTION
67        CpuPowerOff(), # OFF
68    ]
69
70
71def main():
72    parser = argparse.ArgumentParser(
73        description="Generic ARM big.LITTLE configuration with "\
74        "example power models")
75    bL.addOptions(parser)
76    options = parser.parse_args()
77
78    if options.cpu_type != "timing":
79        m5.fatal("The power example script requires 'timing' CPUs.")
80
81    root = bL.build(options)
82
83    # Wire up some example power models to the CPUs
84    for cpu in root.system.descendants():
85        if not isinstance(cpu, m5.objects.BaseCPU):
86            continue
87
88        cpu.default_p_state = "ON"
89        cpu.power_model = CpuPowerModel()
90
91    bL.instantiate(options)
92
93    print "*" * 70
94    print "WARNING: The power numbers generated by this script are " \
95        "examples. They are not representative of any particular " \
96        "implementation or process."
97    print "*" * 70
98
99    # Dumping stats periodically
100    m5.stats.periodicStatDump(m5.ticks.fromSeconds(0.1E-3))
101    bL.run()
102
103
104if __name__ == "__m5_main__":
105    main()
106