gem5/configs/dram/sweep.py
Andreas Sandberg 8702208f3f python: Export periodicStatDump
Some configuration scripts need periodic stat dumps. One of the ways
this can be achieved is by using the pariodicStatDump helper
function. This function was previously only exported in the internal
name space. Export it as a normal function in m5.stat instead.

Change-Id: Ic88bf1fd33042a62ab436d5944d8ed778264ac98
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Sascha Bischoff <sascha.bischoff@arm.com>
2016-12-19 16:25:39 +00:00

208 lines
7.9 KiB
Python

# Copyright (c) 2014-2015 ARM Limited
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# to a hardware implementation of the functionality of the software
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# this software without specific prior written permission.
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# Authors: Andreas Hansson
import optparse
import m5
from m5.objects import *
from m5.util import addToPath
from m5.stats import periodicStatDump
addToPath('../')
from common import MemConfig
# this script is helpful to sweep the efficiency of a specific memory
# controller configuration, by varying the number of banks accessed,
# and the sequential stride size (how many bytes per activate), and
# observe what bus utilisation (bandwidth) is achieved
parser = optparse.OptionParser()
# Use a single-channel DDR3-1600 x64 by default
parser.add_option("--mem-type", type="choice", default="DDR3_1600_x64",
choices=MemConfig.mem_names(),
help = "type of memory to use")
parser.add_option("--mem-ranks", "-r", type="int", default=1,
help = "Number of ranks to iterate across")
parser.add_option("--rd_perc", type="int", default=100,
help = "Percentage of read commands")
parser.add_option("--mode", type="choice", default="DRAM",
choices=["DRAM", "DRAM_ROTATE"],
help = "DRAM: Random traffic; \
DRAM_ROTATE: Traffic rotating across banks and ranks")
parser.add_option("--addr_map", type="int", default=1,
help = "0: RoCoRaBaCh; 1: RoRaBaCoCh/RoRaBaChCo")
(options, args) = parser.parse_args()
if args:
print "Error: script doesn't take any positional arguments"
sys.exit(1)
# at the moment we stay with the default open-adaptive page policy,
# and address mapping
# start with the system itself, using a multi-layer 2.0 GHz
# crossbar, delivering 64 bytes / 3 cycles (one header cycle)
# which amounts to 42.7 GByte/s per layer and thus per port
system = System(membus = IOXBar(width = 32))
system.clk_domain = SrcClockDomain(clock = '2.0GHz',
voltage_domain =
VoltageDomain(voltage = '1V'))
# we are fine with 256 MB memory for now
mem_range = AddrRange('256MB')
system.mem_ranges = [mem_range]
# do not worry about reserving space for the backing store
system.mmap_using_noreserve = True
# force a single channel to match the assumptions in the DRAM traffic
# generator
options.mem_channels = 1
options.external_memory_system = 0
options.tlm_memory = 0
options.elastic_trace_en = 0
MemConfig.config_mem(options, system)
# the following assumes that we are using the native DRAM
# controller, check to be sure
if not isinstance(system.mem_ctrls[0], m5.objects.DRAMCtrl):
fatal("This script assumes the memory is a DRAMCtrl subclass")
# there is no point slowing things down by saving any data
system.mem_ctrls[0].null = True
# Set the address mapping based on input argument
# Default to RoRaBaCoCh
if options.addr_map == 0:
system.mem_ctrls[0].addr_mapping = "RoCoRaBaCh"
elif options.addr_map == 1:
system.mem_ctrls[0].addr_mapping = "RoRaBaCoCh"
else:
fatal("Did not specify a valid address map argument")
# stay in each state for 0.25 ms, long enough to warm things up, and
# short enough to avoid hitting a refresh
period = 250000000
# this is where we go off piste, and print the traffic generator
# configuration that we will later use, crazy but it works
cfg_file_name = "configs/dram/sweep.cfg"
cfg_file = open(cfg_file_name, 'w')
# stay in each state as long as the dump/reset period, use the entire
# range, issue transactions of the right DRAM burst size, and match
# the DRAM maximum bandwidth to ensure that it is saturated
# get the number of banks
nbr_banks = system.mem_ctrls[0].banks_per_rank.value
# determine the burst length in bytes
burst_size = int((system.mem_ctrls[0].devices_per_rank.value *
system.mem_ctrls[0].device_bus_width.value *
system.mem_ctrls[0].burst_length.value) / 8)
# next, get the page size in bytes
page_size = system.mem_ctrls[0].devices_per_rank.value * \
system.mem_ctrls[0].device_rowbuffer_size.value
# match the maximum bandwidth of the memory, the parameter is in seconds
# and we need it in ticks (ps)
itt = system.mem_ctrls[0].tBURST.value * 1000000000000
# assume we start at 0
max_addr = mem_range.end
# use min of the page size and 512 bytes as that should be more than
# enough
max_stride = min(512, page_size)
# now we create the state by iterating over the stride size from burst
# size to the max stride, and from using only a single bank up to the
# number of banks available
nxt_state = 0
for bank in range(1, nbr_banks + 1):
for stride_size in range(burst_size, max_stride + 1, burst_size):
cfg_file.write("STATE %d %d %s %d 0 %d %d "
"%d %d %d %d %d %d %d %d %d\n" %
(nxt_state, period, options.mode, options.rd_perc,
max_addr, burst_size, itt, itt, 0, stride_size,
page_size, nbr_banks, bank, options.addr_map,
options.mem_ranks))
nxt_state = nxt_state + 1
cfg_file.write("INIT 0\n")
# go through the states one by one
for state in range(1, nxt_state):
cfg_file.write("TRANSITION %d %d 1\n" % (state - 1, state))
cfg_file.write("TRANSITION %d %d 1\n" % (nxt_state - 1, nxt_state - 1))
cfg_file.close()
# create a traffic generator, and point it to the file we just created
system.tgen = TrafficGen(config_file = cfg_file_name)
# add a communication monitor
system.monitor = CommMonitor()
# connect the traffic generator to the bus via a communication monitor
system.tgen.port = system.monitor.slave
system.monitor.master = system.membus.slave
# connect the system port even if it is not used in this example
system.system_port = system.membus.slave
# every period, dump and reset all stats
periodicStatDump(period)
# run Forrest, run!
root = Root(full_system = False, system = system)
root.system.mem_mode = 'timing'
m5.instantiate()
m5.simulate(nxt_state * period)
print "DRAM sweep with burst: %d, banks: %d, max stride: %d" % \
(burst_size, nbr_banks, max_stride)