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# Copyright (c) 2022 The Regents of the University of California
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"""
This configuration script shows an example of how to take checkpoints for
SimPoints using the gem5 stdlib. Simpoints are set via a Workload and the
gem5 SimPoint module will calculate where to take checkpoints based of the
SimPoints, SimPoints interval length, and the warmup instruction length.
This scipt builds a simple board with the gem5 stdlib with no cache and a
simple memory structure to take checkpoints. Some of the components, such as
cache hierarchy, can be changed when restoring checkpoints.
Usage
-----
```
scons build/X86/gem5.opt
./build/X86/gem5.opt \
configs/example/gem5_library/checkpoints/simpoints-se-checkpoint.py
./build/X86/gem5.opt \
configs/example/gem5_library/checkpoints/simpoints-se-restore.py
```
"""
import argparse
from gem5.simulate.exit_event import ExitEvent
from gem5.simulate.simulator import Simulator
from gem5.utils.requires import requires
from gem5.components.boards.simple_board import SimpleBoard
from gem5.components.memory.single_channel import SingleChannelDDR3_1600
from gem5.components.processors.simple_processor import SimpleProcessor
from gem5.components.processors.cpu_types import CPUTypes
from gem5.isas import ISA
from gem5.resources.workload import Workload
from gem5.resources.resource import obtain_resource, SimpointResource
from pathlib import Path
from gem5.components.cachehierarchies.classic.no_cache import NoCache
from gem5.simulate.exit_event_generators import (
save_checkpoint_generator,
)
requires(isa_required=ISA.X86)
parser = argparse.ArgumentParser(
description="An example simpoint workload file path"
)
# The lone arguments is a file path to a directory to store the checkpoints.
parser.add_argument(
"--checkpoint-path",
type=str,
required=False,
default="se_checkpoint_folder/",
help="The directory to store the checkpoint.",
)
args = parser.parse_args()
# When taking a checkpoint, the cache state is not saved, so the cache
# hierarchy can be changed completely when restoring from a checkpoint.
# By using NoCache() to take checkpoints, it can slightly improve the
# performance when running in atomic mode, and it will not put any restrictions
# on what people can do with the checkpoints.
cache_hierarchy = NoCache()
# Using simple memory to take checkpoints might slightly imporve the
# performance in atomic mode. The memory structure can be changed when
# restoring from a checkpoint, but the size of the memory must be maintained.
memory = SingleChannelDDR3_1600(size="2GB")
processor = SimpleProcessor(
cpu_type=CPUTypes.ATOMIC,
isa=ISA.X86,
# SimPoints only works with one core
num_cores=1,
)
board = SimpleBoard(
clk_freq="3GHz",
processor=processor,
memory=memory,
cache_hierarchy=cache_hierarchy,
)
# board.set_workload(
# Workload("x86-print-this-15000-with-simpoints")
#
# **Note: This has been removed until we update the resources.json file to
# encapsulate the new Simpoint format.
# Below we set the simpount manually.
board.set_se_simpoint_workload(
binary=obtain_resource("x86-print-this"),
arguments=["print this", 15000],
simpoint=SimpointResource(
simpoint_interval=1000000,
simpoint_list=[2, 3, 4, 15],
weight_list=[0.1, 0.2, 0.4, 0.3],
warmup_interval=1000000,
),
)
dir = Path(args.checkpoint_path)
dir.mkdir(exist_ok=True)
simulator = Simulator(
board=board,
on_exit_event={
# using the SimPoints event generator in the standard library to take
# checkpoints
ExitEvent.SIMPOINT_BEGIN: save_checkpoint_generator(dir)
},
)
simulator.run()