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authorSteve Reinhardt <stever@eecs.umich.edu>2007-07-14 23:49:24 -0700
committerSteve Reinhardt <stever@eecs.umich.edu>2007-07-14 23:49:24 -0700
commit4bcfa916f1f12e8cda253ca7154e75fa1f71ca44 (patch)
treec0e76d846e80932f275155d0a544ea2e05679e5f
parent15a51d0cae01defc116c9a937bfa8c4577f72826 (diff)
downloadgem5-4bcfa916f1f12e8cda253ca7154e75fa1f71ca44.tar.xz
New tree-based algorithm for creating more complex cache hierarchies.
--HG-- extra : convert_revision : de8dd4ef5dae0f3e084461e8ef7c549653e61d3f
-rw-r--r--configs/example/memtest.py143
1 files changed, 73 insertions, 70 deletions
diff --git a/configs/example/memtest.py b/configs/example/memtest.py
index 0e6260b5d..47853ffab 100644
--- a/configs/example/memtest.py
+++ b/configs/example/memtest.py
@@ -49,6 +49,10 @@ parser.add_option("-n", "--numtesters", type="int", default=8,
metavar="N",
help="Number of tester pseudo-CPUs [default: %default]")
+parser.add_option("-t", "--treespec", type="string",
+ help="Colon-separated multilevel tree specification")
+
+
parser.add_option("-f", "--functional", type="int", default=0,
metavar="PCT",
help="Target percentage of functional accesses "
@@ -69,84 +73,83 @@ if args:
print "Error: script doesn't take any positional arguments"
sys.exit(1)
-# Should generalize this someday... would be cool to have a loop that
-# just iterates, adding a level of caching each time.
-#if options.cache_levels != 2 and options.cache_levels != 0:
-# print "Error: number of cache levels must be 0 or 2"
-# sys.exit(1)
-
-if options.blocking:
- num_l1_mshrs = 1
- num_l2_mshrs = 1
-else:
- num_l1_mshrs = 12
- num_l2_mshrs = 92
-
block_size = 64
-# --------------------
-# Base L1 Cache
-# ====================
-
-class L1(BaseCache):
- latency = '1ns'
- block_size = block_size
- mshrs = num_l1_mshrs
- tgts_per_mshr = 8
-
-# ----------------------
-# Base L2 Cache
-# ----------------------
-
-class L2(BaseCache):
- block_size = block_size
- latency = '10ns'
- mshrs = num_l2_mshrs
- tgts_per_mshr = 16
- write_buffers = 8
-
-if options.numtesters > block_size:
+if not options.treespec:
+ # convert simple cache_levels option to treespec
+ treespec = [options.numtesters, 1]
+ numtesters = options.numtesters
+else:
+ try:
+ treespec = [int(x) for x in options.treespec.split(':')]
+ numtesters = reduce(lambda x,y: x*y, treespec)
+ except:
+ print "Error parsing treespec option"
+ sys.exit(1)
+
+if numtesters > block_size:
print "Error: Number of testers limited to %s because of false sharing" \
% (block_size)
sys.exit(1)
-cpus = [ MemTest(atomic=options.atomic, max_loads=options.maxloads,
- percent_functional=options.functional,
- percent_uncacheable=options.uncacheable,
- progress_interval=options.progress)
- for i in xrange(options.numtesters) ]
+if len(treespec) < 1:
+ print "Error parsing treespec"
+ sys.exit(1)
-# system simulated
-system = System(cpu = cpus, funcmem = PhysicalMemory(),
- physmem = PhysicalMemory(latency = "100ns"),
- membus = Bus(clock="500MHz", width=16))
-
-# l2cache & bus
-if options.cache_levels == 2:
- system.toL2Bus = Bus(clock="500MHz", width=16)
- system.l2c = L2(size='64kB', assoc=8)
- system.l2c.cpu_side = system.toL2Bus.port
-
- # connect l2c to membus
- system.l2c.mem_side = system.membus.port
-
-# add L1 caches
-for cpu in cpus:
- if options.cache_levels == 2:
- cpu.l1c = L1(size = '32kB', assoc = 4)
- cpu.test = cpu.l1c.cpu_side
- cpu.l1c.mem_side = system.toL2Bus.port
- elif options.cache_levels == 1:
- cpu.l1c = L1(size = '32kB', assoc = 4)
- cpu.test = cpu.l1c.cpu_side
- cpu.l1c.mem_side = system.membus.port
- else:
- cpu.test = system.membus.port
- system.funcmem.port = cpu.functional
-
-# connect memory to membus
-system.physmem.port = system.membus.port
+# define prototype L1 cache
+proto_l1 = BaseCache(size = '32kB', assoc = 4, block_size = block_size,
+ latency = '1ns', tgts_per_mshr = 8)
+if options.blocking:
+ proto_l1.mshrs = 1
+else:
+ proto_l1.mshrs = 8
+
+# build a list of prototypes, one for each cache level (L1 is at end,
+# followed by the tester pseudo-cpu objects)
+prototypes = [ proto_l1,
+ MemTest(atomic=options.atomic, max_loads=options.maxloads,
+ percent_functional=options.functional,
+ percent_uncacheable=options.uncacheable,
+ progress_interval=options.progress) ]
+
+while len(prototypes) < len(treespec):
+ # clone previous level and update params
+ prev = prototypes[0]
+ next = prev()
+ next.size = prev.size * 4
+ next.latency = prev.latency * 10
+ next.assoc = prev.assoc * 2
+ prototypes.insert(0, next)
+
+# system simulated
+system = System(funcmem = PhysicalMemory(),
+ physmem = PhysicalMemory(latency = "100ns"))
+
+def make_level(spec, prototypes, attach_obj, attach_port):
+ fanout = spec[0]
+ parent = attach_obj # use attach obj as config parent too
+ if fanout > 1:
+ new_bus = Bus(clock="500MHz", width=16)
+ new_bus.port = getattr(attach_obj, attach_port)
+ parent.cpu_side_bus = new_bus
+ attach_obj = new_bus
+ attach_port = "port"
+ objs = [prototypes[0]() for i in xrange(fanout)]
+ if len(spec) > 1:
+ # we just built caches, more levels to go
+ parent.cache = objs
+ for cache in objs:
+ cache.mem_side = getattr(attach_obj, attach_port)
+ make_level(spec[1:], prototypes[1:], cache, "cpu_side")
+ else:
+ # we just built the MemTest objects
+ parent.cpu = objs
+ for t in objs:
+ t.test = getattr(attach_obj, attach_port)
+ t.functional = system.funcmem.port
+
+make_level(treespec, prototypes, system.physmem, "port")
# -----------------------
# run simulation