gem5/configs/example/memcheck.py

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# Authors: Ron Dreslinski
#          Andreas Hansson

import optparse
import random
import sys

import m5
from m5.objects import *

parser = optparse.OptionParser()

parser.add_option("-a", "--atomic", action="store_true",
                  help="Use atomic (non-timing) mode")
parser.add_option("-b", "--blocking", action="store_true",
                  help="Use blocking caches")
parser.add_option("-m", "--maxtick", type="int", default=m5.MaxTick,
                  metavar="T",
                  help="Stop after T ticks")
parser.add_option("-p", "--prefetchers", action="store_true",
                  help="Use prefetchers")
parser.add_option("-s", "--stridepref", action="store_true",
                  help="Use strided prefetchers")

# This example script has a lot in common with the memtest.py in that
# it is designed to stress tests the memory system. However, this
# script uses oblivious traffic generators to create the stimuli, and
# couples them with memcheckers to verify that the data read matches
# the allowed outcomes. Just like memtest.py, the traffic generators
# and checkers are placed in a tree topology. At the bottom of the
# tree is a shared memory, and then at each level a number of
# generators and checkers are attached, along with a number of caches
# that them selves fan out to subtrees of generators and caches. Thus,
# it is possible to create a system with arbitrarily deep cache
# hierarchies, sharing or no sharing of caches, and generators not
# only at the L1s, but also at the L2s, L3s etc.
#
# The tree specification consists of two colon-separated lists of one
# or more integers, one for the caches, and one for the
# testers/generators. The first integer is the number of
# caches/testers closest to main memory. Each cache then fans out to a
# subtree. The last integer in the list is the number of
# caches/testers associated with the uppermost level of memory. The
# other integers (if any) specify the number of caches/testers
# connected at each level of the crossbar hierarchy. The tester string
# should have one element more than the cache string as there should
# always be testers attached to the uppermost caches.
#
# Since this script tests actual sharing, there is also a possibility
# to stress prefetching and the interaction between prefetchers and
# caches. The traffic generators switch between random address streams
# and linear address streams to ensure that the prefetchers will
# trigger. By default prefetchers are off.

parser.add_option("-c", "--caches", type="string", default="3:2",
                  help="Colon-separated cache hierarchy specification, "
                  "see script comments for details "
                  "[default: %default]")
parser.add_option("-t", "--testers", type="string", default="1:0:2",
                  help="Colon-separated tester hierarchy specification, "
                  "see script comments for details "
                  "[default: %default]")
parser.add_option("-r", "--random", action="store_true",
                  help="Generate a random tree topology")
parser.add_option("--sys-clock", action="store", type="string",
                  default='1GHz',
                  help = """Top-level clock for blocks running at system
                  speed""")

(options, args) = parser.parse_args()

if args:
     print "Error: script doesn't take any positional arguments"
     sys.exit(1)

# Start by parsing the command line options and do some basic sanity
# checking
if options.random:
     # Generate a tree with a valid number of testers
     tree_depth = random.randint(1, 4)
     cachespec = [random.randint(1, 3) for i in range(tree_depth)]
     testerspec = [random.randint(1, 3) for i in range(tree_depth + 1)]
     print "Generated random tree -c", ':'.join(map(str, cachespec)), \
         "-t", ':'.join(map(str, testerspec))
else:
     try:
          cachespec = [int(x) for x in options.caches.split(':')]
          testerspec = [int(x) for x in options.testers.split(':')]
     except:
          print "Error: Unable to parse caches or testers option"
          sys.exit(1)

     if len(cachespec) < 1:
          print "Error: Must have at least one level of caches"
          sys.exit(1)

     if len(cachespec) != len(testerspec) - 1:
          print "Error: Testers must have one element more than caches"
          sys.exit(1)

     if testerspec[-1] == 0:
          print "Error: Must have testers at the uppermost level"
          sys.exit(1)

     for t in testerspec:
          if t < 0:
               print "Error: Cannot have a negative number of testers"
               sys.exit(1)

     for c in cachespec:
          if c < 1:
               print "Error: Must have 1 or more caches at each level"
               sys.exit(1)

# Determine the tester multiplier for each level as the string
# elements are per subsystem and it fans out
multiplier = [1]
for c in cachespec:
     if c < 1:
          print "Error: Must have at least one cache per level"
     multiplier.append(multiplier[-1] * c)

numtesters = 0
for t, m in zip(testerspec, multiplier):
     numtesters += t * m

# Define a prototype L1 cache that we scale for all successive levels
proto_l1 = Cache(size = '32kB', assoc = 4,
                 tag_latency = 1, data_latency = 1, response_latency = 1,
                 tgts_per_mshr = 8)

if options.blocking:
     proto_l1.mshrs = 1
else:
     proto_l1.mshrs = 4

if options.prefetchers:
     proto_l1.prefetcher = TaggedPrefetcher()
elif options.stridepref:
     proto_l1.prefetcher = StridePrefetcher()

cache_proto = [proto_l1]

# Now add additional cache levels (if any) by scaling L1 params, the
# first element is Ln, and the last element L1
for scale in cachespec[:-1]:
     # Clone previous level and update params
     prev = cache_proto[0]
     next = prev()
     next.size = prev.size * scale
     next.tag_latency = prev.tag_latency * 10
     next.data_latency = prev.data_latency * 10
     next.response_latency = prev.response_latency * 10
     next.assoc = prev.assoc * scale
     next.mshrs = prev.mshrs * scale
     cache_proto.insert(0, next)

# Create a config to be used by all the traffic generators
cfg_file_name = "configs/example/memcheck.cfg"
cfg_file = open(cfg_file_name, 'w')

# Three states, with random, linear and idle behaviours. The random
# and linear states access memory in the range [0 : 16 Mbyte] with 8
# byte and 64 byte accesses respectively.
cfg_file.write("STATE 0 10000000 RANDOM 65 0 16777216 8 50000 150000 0\n")
cfg_file.write("STATE 1 10000000 LINEAR 65 0 16777216 64 50000 150000 0\n")
cfg_file.write("STATE 2 10000000 IDLE\n")
cfg_file.write("INIT 0\n")
cfg_file.write("TRANSITION 0 1 0.5\n")
cfg_file.write("TRANSITION 0 2 0.5\n")
cfg_file.write("TRANSITION 1 0 0.5\n")
cfg_file.write("TRANSITION 1 2 0.5\n")
cfg_file.write("TRANSITION 2 0 0.5\n")
cfg_file.write("TRANSITION 2 1 0.5\n")
cfg_file.close()

# Make a prototype for the tester to be used throughout
proto_tester = TrafficGen(config_file = cfg_file_name)

# Set up the system along with a DRAM controller
system = System(physmem = DDR3_1600_8x8())

system.voltage_domain = VoltageDomain(voltage = '1V')

system.clk_domain = SrcClockDomain(clock =  options.sys_clock,
                        voltage_domain = system.voltage_domain)

system.memchecker = MemChecker()

# For each level, track the next subsys index to use
next_subsys_index = [0] * (len(cachespec) + 1)

# Recursive function to create a sub-tree of the cache and tester
# hierarchy
def make_cache_level(ncaches, prototypes, level, next_cache):
     global next_subsys_index, proto_l1, testerspec, proto_tester

     index = next_subsys_index[level]
     next_subsys_index[level] += 1

     # Create a subsystem to contain the crossbar and caches, and
     # any testers
     subsys = SubSystem()
     setattr(system, 'l%dsubsys%d' % (level, index), subsys)

     # The levels are indexing backwards through the list
     ntesters = testerspec[len(cachespec) - level]

     testers = [proto_tester() for i in xrange(ntesters)]
     checkers = [MemCheckerMonitor(memchecker = system.memchecker) \
                      for i in xrange(ntesters)]
     if ntesters:
          subsys.tester = testers
          subsys.checkers = checkers

     if level != 0:
          # Create a crossbar and add it to the subsystem, note that
          # we do this even with a single element on this level
          xbar = L2XBar(width = 32)
          subsys.xbar = xbar
          if next_cache:
               xbar.master = next_cache.cpu_side

          # Create and connect the caches, both the ones fanning out
          # to create the tree, and the ones used to connect testers
          # on this level
          tree_caches = [prototypes[0]() for i in xrange(ncaches[0])]
          tester_caches = [proto_l1() for i in xrange(ntesters)]

          subsys.cache = tester_caches + tree_caches
          for cache in tree_caches:
               cache.mem_side = xbar.slave
               make_cache_level(ncaches[1:], prototypes[1:], level - 1, cache)
          for tester, checker, cache in zip(testers, checkers, tester_caches):
               tester.port = checker.slave
               checker.master = cache.cpu_side
               cache.mem_side = xbar.slave
     else:
          if not next_cache:
               print "Error: No next-level cache at top level"
               sys.exit(1)

          if ntesters > 1:
               # Create a crossbar and add it to the subsystem
               xbar = L2XBar(width = 32)
               subsys.xbar = xbar
               xbar.master = next_cache.cpu_side
               for tester, checker in zip(testers, checkers):
                    tester.port = checker.slave
                    checker.master = xbar.slave
          else:
               # Single tester
               testers[0].port = checkers[0].slave
               checkers[0].master = next_cache.cpu_side

# Top level call to create the cache hierarchy, bottom up
make_cache_level(cachespec, cache_proto, len(cachespec), None)

# Connect the lowest level crossbar to the memory
last_subsys = getattr(system, 'l%dsubsys0' % len(cachespec))
last_subsys.xbar.master = system.physmem.port
last_subsys.xbar.point_of_coherency = True

root = Root(full_system = False, system = system)
if options.atomic:
    root.system.mem_mode = 'atomic'
else:
    root.system.mem_mode = 'timing'

# The system port is never used in the tester so merely connect it
# to avoid problems
root.system.system_port = last_subsys.xbar.slave

# Instantiate configuration
m5.instantiate()

# Simulate until program terminates
exit_event = m5.simulate(options.maxtick)

print 'Exiting @ tick', m5.curTick(), 'because', exit_event.getCause()