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authorAndreas Sandberg <andreas.sandberg@arm.com>2017-04-05 17:02:21 +0100
committerAndreas Sandberg <andreas.sandberg@arm.com>2017-04-11 23:57:26 +0000
commitf6fb875c4e09b5da98409e6553a47a77ad802de4 (patch)
treefeb292523e4da32a283d308b542aa50781668c0b /configs
parentf7b3df49c1f5a45b9edc0d320d8ed09afc1ef21c (diff)
downloadgem5-f6fb875c4e09b5da98409e6553a47a77ad802de4.tar.xz
config, arm: Add an example power model
Add a script to demonstrate how power models can be wired to gem5 models. The script is meant as an example only and does not correlate with any realistic implementation. Change-Id: Ib95a74b2cb4af77a7816e3e8e89c89f3460775a1 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/2721 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.com>
Diffstat (limited to 'configs')
-rw-r--r--configs/example/arm/fs_power.py105
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diff --git a/configs/example/arm/fs_power.py b/configs/example/arm/fs_power.py
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+# Copyright (c) 2017 ARM Limited
+# All rights reserved.
+#
+# The license below extends only to copyright in the software and shall
+# not be construed as granting a license to any other intellectual
+# property including but not limited to intellectual property relating
+# to a hardware implementation of the functionality of the software
+# licensed hereunder. You may use the software subject to the license
+# terms below provided that you ensure that this notice is replicated
+# unmodified and in its entirety in all distributions of the software,
+# modified or unmodified, in source code or in binary form.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Authors: Andreas Sandberg
+# Stephan Diestelhorst
+
+# This configuration file extends the example ARM big.LITTLE(tm)
+# with example power models.
+
+import argparse
+import os
+
+import m5
+from m5.objects import MathExprPowerModel, PowerModel
+
+import fs_bigLITTLE as bL
+
+
+class CpuPowerOn(MathExprPowerModel):
+ # 2A per IPC, 3pA per cache miss
+ # and then convert to Watt
+ dyn = "voltage * (2 * ipc + " \
+ "3 * 0.000000001 * dcache.overall_misses / sim_seconds)"
+ st = "4 * temp"
+
+class CpuPowerOff(MathExprPowerModel):
+ dyn = "0"
+ st = "0"
+
+class CpuPowerModel(PowerModel):
+ pm = [
+ CpuPowerOn(), # ON
+ CpuPowerOff(), # CLK_GATED
+ CpuPowerOff(), # SRAM_RETENTION
+ CpuPowerOff(), # OFF
+ ]
+
+
+def main():
+ parser = argparse.ArgumentParser(
+ description="Generic ARM big.LITTLE configuration with "\
+ "example power models")
+ bL.addOptions(parser)
+ options = parser.parse_args()
+
+ if options.cpu_type != "timing":
+ m5.fatal("The power example script requires 'timing' CPUs.")
+
+ root = bL.build(options)
+
+ # Wire up some example power models to the CPUs
+ for cpu in root.system.descendants():
+ if not isinstance(cpu, m5.objects.BaseCPU):
+ continue
+
+ cpu.default_p_state = "ON"
+ cpu.power_model = CpuPowerModel()
+
+ bL.instantiate(options)
+
+ print "*" * 70
+ print "WARNING: The power numbers generated by this script are " \
+ "examples. They are not representative of any particular " \
+ "implementation or process."
+ print "*" * 70
+
+ # Dumping stats periodically
+ m5.stats.periodicStatDump(m5.ticks.fromSeconds(0.1E-3))
+ bL.run()
+
+
+if __name__ == "__m5_main__":
+ main()