derek/gem5
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

configs: Change fs_power.py to use absolute paths for stats

Browse Source 
fs_power.py is an example script that demonstrates how power models
can be used with gem5. Previously, the formulas used to calculate the
dynamic and static power of the cores and the L2 cache were using
stats in equations as determined by their path relative to the
SimObject where the power model is attached to or full paths. This CL
changes these formulas to refer to the stats only by their full paths.

Change-Id: I91ea16c88c6a884fce90fd4cd2dfabcba4a1326c
Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27893
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
Nikos Nikoleris
2020-04-07 15:43:23 +01:00
parent 274c0e0ae1
commit 84003b7cc7
1 changed files with 35 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
configs/example/arm/fs_power.py
View File

@@ -1,4 +1,4 @@
# Copyright (c) 2017 ARM Limited
# Copyright (c) 2017, 2020 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
@@ -49,42 +49,52 @@ 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"
def __init__(self, cpu_path, **kwargs):
super(CpuPowerOn, self).__init__(**kwargs)
# 2A per IPC, 3pA per cache miss
# and then convert to Watt
self.dyn = "voltage * (2 * {}.ipc + 3 * 0.000000001 * " \
"{}.dcache.overall_misses / sim_seconds)".format(cpu_path,
cpu_path)
self.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 __init__(self, cpu_path, **kwargs):
super(CpuPowerModel, self).__init__(**kwargs)
self.pm = [
CpuPowerOn(cpu_path), # ON
CpuPowerOff(), # CLK_GATED
CpuPowerOff(), # SRAM_RETENTION
CpuPowerOff(), # OFF
]
class L2PowerOn(MathExprPowerModel):
# Example to report l2 Cache overall_accesses
# The estimated power is converted to Watt and will vary based on the size of the cache
dyn = "overall_accesses*0.000018000"
st = "(voltage * 3)/10"
def __init__(self, l2_path, **kwargs):
super(L2PowerOn, self).__init__(**kwargs)
# Example to report l2 Cache overall_accesses
# The estimated power is converted to Watt and will vary based
# on the size of the cache
self.dyn = "{}.overall_accesses * 0.000018000".format(l2_path)
self.st = "(voltage * 3)/10"
class L2PowerOff(MathExprPowerModel):
dyn = "0"
st = "0"
class L2PowerModel(PowerModel):
# Choose a power model for every power state
pm = [
L2PowerOn(), # ON
L2PowerOff(), # CLK_GATED
L2PowerOff(), # SRAM_RETENTION
L2PowerOff(), # OFF
]
def __init__(self, l2_path, **kwargs):
super(L2PowerModel, self).__init__(**kwargs)
# Choose a power model for every power state
self.pm = [
L2PowerOn(l2_path), # ON
L2PowerOff(), # CLK_GATED
L2PowerOff(), # SRAM_RETENTION
L2PowerOff(), # OFF
]
def main():
@@ -105,7 +115,7 @@ def main():
continue
cpu.default_p_state = "ON"
cpu.power_model = CpuPowerModel()
cpu.power_model = CpuPowerModel(cpu.path())
# Example power model for the L2 Cache of the bigCluster
for l2 in root.system.bigCluster.l2.descendants():
@@ -113,7 +123,7 @@ def main():
continue
l2.default_p_state = "ON"
l2.power_model = L2PowerModel()
l2.power_model = L2PowerModel(l2.path())
bL.instantiate(options)