Cross Reference: /gem5/configs/dram/lat_mem

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1# Copyright (c) 2015-2016 ARM Limited
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
6# property including but not limited to intellectual property relating
7# to a hardware implementation of the functionality of the software
8# licensed hereunder. You may use the software subject to the license

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30# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
34# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35#
36# Authors: Andreas Hansson
37

38from __future__ import print_function
39

40import gzip
41import optparse
42import os
43
44import m5
45from m5.objects import *
46from m5.util import addToPath
47from m5.stats import periodicStatDump

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57# configurations, in essence replicating the lmbench lat_mem_rd thrash
58# behaviour
59
60# import the packet proto definitions, and if they are not found,
61# attempt to generate them automatically
62try:
63 import packet_pb2
64except:

63 print "Did not find packet proto definitions, attempting to generate"

65 print("Did not find packet proto definitions, attempting to generate")

66 from subprocess import call
67 error = call(['protoc', '--python_out=configs/dram',
68 '--proto_path=src/proto', 'src/proto/packet.proto'])
69 if not error:

68 print "Generated packet proto definitions"

70 print("Generated packet proto definitions")

71
72 try:
73 import google.protobuf
74 except:

73 print "Please install the Python protobuf module"

75 print("Please install the Python protobuf module")

76 exit(-1)
77
78 import packet_pb2
79 else:

78 print "Failed to import packet proto definitions"

80 print("Failed to import packet proto definitions")

81 exit(-1)
82
83parser = optparse.OptionParser()
84
85parser.add_option("--mem-type", type="choice", default="DDR3_1600_8x8",
86 choices=MemConfig.mem_names(),
87 help = "type of memory to use")
88parser.add_option("--mem-size", action="store", type="string",
89 default="16MB",
90 help="Specify the memory size")
91parser.add_option("--reuse-trace", action="store_true",
92 help="Prevent generation of traces and reuse existing")
93
94(options, args) = parser.parse_args()
95
96if args:

95 print "Error: script doesn't take any positional arguments"

97 print("Error: script doesn't take any positional arguments")

98 sys.exit(1)
99
100# start by creating the system itself, using a multi-layer 2.0 GHz
101# crossbar, delivering 64 bytes / 3 cycles (one header cycle) which
102# amounts to 42.7 GByte/s per layer and thus per port
103system = System(membus = SystemXBar(width = 32))
104system.clk_domain = SrcClockDomain(clock = '2.0GHz',
105 voltage_domain =

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168
169# for every data point, we create a trace containing a random address
170# sequence, so that we can play back the same sequence for warming and
171# the actual measurement
172def create_trace(filename, max_addr, burst_size, itt):
173 try:
174 proto_out = gzip.open(filename, 'wb')
175 except IOError:

~~174~~ print "Failed to open ", filename, " for writing"

176 print("Failed to open ", filename, " for writing")

177 exit(-1)
178
179 # write the magic number in 4-byte Little Endian, similar to what
180 # is done in src/proto/protoio.cc
181 proto_out.write("gem5")
182
183 # add the packet header
184 header = packet_pb2.PacketHeader()

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205 packet.tick = long(tick)
206 packet.addr = long(addr)
207 protolib.encodeMessage(proto_out, packet)
208 tick = tick + itt
209
210 proto_out.close()
211
212# this will take a while, so keep the user informed

~~211~~print "Generating traces, please wait..."

213print("Generating traces, please wait...")

214
215nxt_range = 0
216nxt_state = 0
217period = long(itt * (max_range / burst_size))
218
219# now we create the states for each range
220for r in ranges:
221 filename = os.path.join(m5.options.outdir,

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301# run Forrest, run!
302root = Root(full_system = False, system = system)
303root.system.mem_mode = 'timing'
304
305m5.instantiate()
306m5.simulate(nxt_state * period)
307
308# print all we need to make sense of the stats output