memtest.py revision 4891:02babad9bfce
1# Copyright (c) 2006-2007 The Regents of The University of Michigan 2# All rights reserved. 3# 4# Redistribution and use in source and binary forms, with or without 5# modification, are permitted provided that the following conditions are 6# met: redistributions of source code must retain the above copyright 7# notice, this list of conditions and the following disclaimer; 8# redistributions in binary form must reproduce the above copyright 9# notice, this list of conditions and the following disclaimer in the 10# documentation and/or other materials provided with the distribution; 11# neither the name of the copyright holders nor the names of its 12# contributors may be used to endorse or promote products derived from 13# this software without specific prior written permission. 14# 15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26# 27# Authors: Ron Dreslinski 28 29import m5 30from m5.objects import * 31import os, optparse, sys 32m5.AddToPath('../common') 33 34parser = optparse.OptionParser() 35 36parser.add_option("-c", "--cache-levels", type="int", default=2, 37 metavar="LEVELS", 38 help="Number of cache levels [default: %default]") 39parser.add_option("-a", "--atomic", action="store_true", 40 help="Use atomic (non-timing) mode") 41parser.add_option("-b", "--blocking", action="store_true", 42 help="Use blocking caches") 43parser.add_option("-l", "--maxloads", default="1G", metavar="N", 44 help="Stop after N loads [default: %default]") 45parser.add_option("-m", "--maxtick", type="int", default=m5.MaxTick, 46 metavar="T", 47 help="Stop after T ticks") 48parser.add_option("-n", "--numtesters", type="int", default=8, 49 metavar="N", 50 help="Number of tester pseudo-CPUs [default: %default]") 51 52parser.add_option("-t", "--treespec", type="string", 53 help="Colon-separated multilevel tree specification") 54 55parser.add_option("--force-bus", action="store_true", 56 help="Use bus between levels even with single cache") 57 58parser.add_option("-f", "--functional", type="int", default=0, 59 metavar="PCT", 60 help="Target percentage of functional accesses " 61 "[default: %default]") 62parser.add_option("-u", "--uncacheable", type="int", default=0, 63 metavar="PCT", 64 help="Target percentage of uncacheable accesses " 65 "[default: %default]") 66 67parser.add_option("--progress", type="int", default=1000, 68 metavar="NLOADS", 69 help="Progress message interval " 70 "[default: %default]") 71 72(options, args) = parser.parse_args() 73 74if args: 75 print "Error: script doesn't take any positional arguments" 76 sys.exit(1) 77 78block_size = 64 79 80if not options.treespec: 81 # convert simple cache_levels option to treespec 82 treespec = [options.numtesters, 1] 83 numtesters = options.numtesters 84else: 85 try: 86 treespec = [int(x) for x in options.treespec.split(':')] 87 numtesters = reduce(lambda x,y: x*y, treespec) 88 except: 89 print "Error parsing treespec option" 90 sys.exit(1) 91 92if numtesters > block_size: 93 print "Error: Number of testers limited to %s because of false sharing" \ 94 % (block_size) 95 sys.exit(1) 96 97if len(treespec) < 1: 98 print "Error parsing treespec" 99 sys.exit(1) 100 101# define prototype L1 cache 102proto_l1 = BaseCache(size = '32kB', assoc = 4, block_size = block_size, 103 latency = '1ns', tgts_per_mshr = 8) 104 105if options.blocking: 106 proto_l1.mshrs = 1 107else: 108 proto_l1.mshrs = 8 109 110# build a list of prototypes, one for each cache level (L1 is at end, 111# followed by the tester pseudo-cpu objects) 112prototypes = [ proto_l1, 113 MemTest(atomic=options.atomic, max_loads=options.maxloads, 114 percent_functional=options.functional, 115 percent_uncacheable=options.uncacheable, 116 progress_interval=options.progress) ] 117 118while len(prototypes) < len(treespec): 119 # clone previous level and update params 120 prev = prototypes[0] 121 next = prev() 122 next.size = prev.size * 4 123 next.latency = prev.latency * 10 124 next.assoc = prev.assoc * 2 125 prototypes.insert(0, next) 126 127# system simulated 128system = System(funcmem = PhysicalMemory(), 129 physmem = PhysicalMemory(latency = "100ns")) 130 131def make_level(spec, prototypes, attach_obj, attach_port): 132 fanout = spec[0] 133 parent = attach_obj # use attach obj as config parent too 134 if fanout > 1 or options.force_bus: 135 new_bus = Bus(clock="500MHz", width=16) 136 new_bus.port = getattr(attach_obj, attach_port) 137 parent.cpu_side_bus = new_bus 138 attach_obj = new_bus 139 attach_port = "port" 140 objs = [prototypes[0]() for i in xrange(fanout)] 141 if len(spec) > 1: 142 # we just built caches, more levels to go 143 parent.cache = objs 144 for cache in objs: 145 cache.mem_side = getattr(attach_obj, attach_port) 146 make_level(spec[1:], prototypes[1:], cache, "cpu_side") 147 else: 148 # we just built the MemTest objects 149 parent.cpu = objs 150 for t in objs: 151 t.test = getattr(attach_obj, attach_port) 152 t.functional = system.funcmem.port 153 154make_level(treespec, prototypes, system.physmem, "port") 155 156# ----------------------- 157# run simulation 158# ----------------------- 159 160root = Root( system = system ) 161if options.atomic: 162 root.system.mem_mode = 'atomic' 163else: 164 root.system.mem_mode = 'timing' 165 166# Not much point in this being higher than the L1 latency 167m5.ticks.setGlobalFrequency('1ns') 168 169# instantiate configuration 170m5.instantiate(root) 171 172# simulate until program terminates 173exit_event = m5.simulate(options.maxtick) 174 175print 'Exiting @ tick', m5.curTick(), 'because', exit_event.getCause() 176