def setUp(self):
self.tracker = SimulationStatisticsTracker()
self.bus = Bus()
self.caches = []
for i in range(4):
cache = Cache(
i, # Cache id
StatisticsTest._NUMBER_OF_CACHE_LINES,
StatisticsTest._SIZE_OF_CACHE_LINE,
self.bus,
self.tracker,
debug_mode=False)
self.caches.append(cache)
class StatisticsTest(unittest.TestCase):
"""Tests for the statistics module."""
# Default configuration for caches.
_NUMBER_OF_CACHE_LINES = 128
_SIZE_OF_CACHE_LINE = 4
def setUp(self):
self.tracker = SimulationStatisticsTracker()
self.bus = Bus()
self.caches = []
for i in range(4):
cache = Cache(
i, # Cache id
StatisticsTest._NUMBER_OF_CACHE_LINES,
StatisticsTest._SIZE_OF_CACHE_LINE,
self.bus,
self.tracker,
debug_mode=False)
self.caches.append(cache)
def test_initialization(self):
"""Test that a SimulationStatisticsTracker is initialized properly."""
# setUp() adds 4 caches.
self.assertEqual(len(self.tracker.caches), 4)
def test_basic_miss_tracking(self):
"""Test the basic miss tracking, without coherence influences."""
# First test the basic MSI protocol, using P0.
# INVALID + read ==> read_miss + SHARED.
# INVALID + write ==> write_miss + MODIFIED.
# SHARED + read ==> read_hit + SHARED.
# SHARED + write ==> write_miss + MODIFIED.
# MODIFIED + read ==> read_hit + MODIFIED.
# MODIFIED + write ==> write_hit + MODIFIED.
cache = self.caches[0]
cache_stats = self.tracker.caches[0]
# Initial test.
self.assertEqual(cache_stats.hits, 0)
self.assertEqual(cache_stats.read_hits, 0)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 0)
self.assertEqual(cache_stats.read_misses, 0)
self.assertEqual(cache_stats.write_misses, 0)
cache.read(0) # Read miss to INVALID.
self.assertEqual(cache_stats.hits, 0)
self.assertEqual(cache_stats.read_hits, 0)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 1)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 0)
cache.write(4) # Write miss to INVALID.
self.assertEqual(cache_stats.hits, 0)
self.assertEqual(cache_stats.read_hits, 0)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 2)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 1)
cache.read(1) # Read hit to SHARED.
self.assertEqual(cache_stats.hits, 1)
self.assertEqual(cache_stats.read_hits, 1)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 2)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 1)
cache.write(2) # Write miss to SHARED.
self.assertEqual(cache_stats.hits, 1)
self.assertEqual(cache_stats.read_hits, 1)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 3)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 2)
cache.read(0) # Read hit to MODIFIED.
self.assertEqual(cache_stats.hits, 2)
self.assertEqual(cache_stats.read_hits, 2)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 3)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 2)
cache.write(0) # Write hit to MODIFIED.
self.assertEqual(cache_stats.hits, 3)
self.assertEqual(cache_stats.read_hits, 2)
self.assertEqual(cache_stats.write_hits, 1)
self.assertEqual(cache_stats.misses, 3)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 2)
# Now test a set of basic instructions, using P1.
cache = self.caches[1]
cache_stats = self.tracker.caches[1]
cache.read(5) # Read miss.
cache.write(10) # Write miss.
cache.read(11) # Read hit.
cache.read(6) # Read hit.
cache.read(20) # Read miss.
cache.write(11) # Write hit.
cache.write(7) # Write miss.
cache.read(5) # Read hit.
cache.read(24) # Read miss.
cache.write(35) # Write miss.
cache.write(24) # Write miss.
cache.read(2053) # Read miss.
cache.read(5) # Read miss.
self.assertEqual(cache_stats.hits, 4)
self.assertEqual(cache_stats.read_hits, 3)
self.assertEqual(cache_stats.write_hits, 1)
self.assertEqual(cache_stats.misses, 9)
self.assertEqual(cache_stats.read_misses, 5)
self.assertEqual(cache_stats.write_misses, 4)
def test_coherence_influenced_miss_tracking(self):
"""Test miss tracking, with coherence influences.
These tests are not fully complete, but should cover many cases."""
# First test the basic remote MSI protocol, using P0 and P1.
# INVALID + remote read miss ==> INVALID.
# INVALID + remote write miss ==> INVALID.
# SHARED + remote read miss ==> SHARED.
# SHARED + remote write miss ==> INVALID.
# MODIFIED + remote read miss ==> SHARED.
# MODIFIED + remote write miss ==> INVALID.
cache0 = self.caches[0]
cache1 = self.caches[1]
cache_stats = self.tracker.caches[0]
cache1.read(1) # Remote read miss to INVALID line.
self.assertEqual(cache_stats.hits, 0)
self.assertEqual(cache_stats.read_hits, 0)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 0)
self.assertEqual(cache_stats.read_misses, 0)
self.assertEqual(cache_stats.write_misses, 0)
self.assertEqual(cache_stats.coherence_misses, 0)
cache1.write(1) # Remote write miss to INVALID line.
self.assertEqual(cache_stats.hits, 0)
self.assertEqual(cache_stats.read_hits, 0)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 0)
self.assertEqual(cache_stats.read_misses, 0)
self.assertEqual(cache_stats.write_misses, 0)
self.assertEqual(cache_stats.coherence_misses, 0)
# SHARED + remote read miss.
cache0.read(4) # Prime cache to SHARED.
cache1.read(5) # Remote read miss to the SHARED line.
cache0.read(4) # Should still be SHARED so hit.
self.assertEqual(cache_stats.hits, 1)
self.assertEqual(cache_stats.read_hits, 1)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 1)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 0)
self.assertEqual(cache_stats.coherence_misses, 0)
# SHARED + remote write miss.
cache1.write(6) # Remote write miss to the SHARED line.
cache0.write(6) # Should now be INVALID so miss.
self.assertEqual(cache_stats.hits, 1)
self.assertEqual(cache_stats.read_hits, 1)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 2)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 1)
self.assertEqual(cache_stats.coherence_misses, 1)
# MODIFIED + remote read miss.
cache1.read(7) # Remote read miss to the MODIFIED line.
cache0.write(4) # Should now be SHARED so miss.
self.assertEqual(cache_stats.hits, 1)
self.assertEqual(cache_stats.read_hits, 1)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 3)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 2)
self.assertEqual(cache_stats.coherence_misses, 2)
# MODIFIED + remote read miss 2.
cache1.read(7) # Remote read miss to the MODIFIED line.
cache0.read(4) # Should now be SHARED so hit.
self.assertEqual(cache_stats.hits, 2)
self.assertEqual(cache_stats.read_hits, 2)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 3)
self.assertEqual(cache_stats.read_misses, 1)
self.assertEqual(cache_stats.write_misses, 2)
self.assertEqual(cache_stats.coherence_misses, 2)
# MODIFIED + remote write miss.
cache0.write(5) # Prime cache (miss)
cache1.write(7) # Remote write miss to the MODIFIED line.
cache0.read(6) # Should now be INVALID so miss.
self.assertEqual(cache_stats.hits, 2)
self.assertEqual(cache_stats.read_hits, 2)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 5)
self.assertEqual(cache_stats.read_misses, 2)
self.assertEqual(cache_stats.write_misses, 3)
self.assertEqual(cache_stats.coherence_misses, 3)
# MODIFIED + remote write miss 2.
cache0.write(7) # Prime cache (miss)
cache1.write(5) # Remote write miss to the MODIFIED line.
cache0.write(4) # Should now be INVALID so miss.
self.assertEqual(cache_stats.hits, 2)
self.assertEqual(cache_stats.read_hits, 2)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 7)
self.assertEqual(cache_stats.read_misses, 2)
self.assertEqual(cache_stats.write_misses, 5)
self.assertEqual(cache_stats.coherence_misses, 4)
# Finish off by checking P1.
cache_stats = self.tracker.caches[1]
self.assertEqual(cache_stats.hits, 0)
self.assertEqual(cache_stats.read_hits, 0)
self.assertEqual(cache_stats.write_hits, 0)
self.assertEqual(cache_stats.misses, 8)
self.assertEqual(cache_stats.read_misses, 4)
self.assertEqual(cache_stats.write_misses, 4)
self.assertEqual(cache_stats.coherence_misses, 4)
def test_address_tracking(self):
"""Test address tracking."""
# First do basic tests just by counting accessed address sets.
for cache_stats in self.tracker.caches.values():
self.assertEqual(len(cache_stats.accessed_addresses), 0)
# Addresses 0, 1, 2, 3 only accessed by one processor (P0, ..., P4).
self.caches[0].read(0)
self.caches[1].write(1)
self.caches[2].read(2)
self.caches[3].read(3)
for cache_stats in self.tracker.caches.values():
self.assertEqual(len(cache_stats.accessed_addresses), 1)
# Address 5, 6 are accessed by two processors.
self.caches[0].read(5)
self.caches[1].write(5)
self.caches[2].write(6)
self.caches[3].write(6)
for cache_stats in self.tracker.caches.values():
self.assertEqual(len(cache_stats.accessed_addresses), 2)
# Address 7 accessed by three processors (P0, P1, P3).
self.caches[0].read(7)
self.caches[1].write(7)
self.caches[2].read(2) # Another access to address 2.
self.caches[3].write(7)
self.assertEqual(len(self.tracker.caches[0].accessed_addresses), 3)
self.assertEqual(len(self.tracker.caches[1].accessed_addresses), 3)
self.assertEqual(len(self.tracker.caches[2].accessed_addresses), 2)
self.assertEqual(len(self.tracker.caches[3].accessed_addresses), 3)
# Address 8 accessed by all.
self.caches[0].read(8)
self.caches[1].write(8)
self.caches[2].read(8)
self.caches[3].write(8)
self.assertEqual(len(self.tracker.caches[0].accessed_addresses), 4)
self.assertEqual(len(self.tracker.caches[1].accessed_addresses), 4)
self.assertEqual(len(self.tracker.caches[2].accessed_addresses), 3)
self.assertEqual(len(self.tracker.caches[3].accessed_addresses), 4)
# Now do `proper' tests with post-computed statistics.
# First, reset.
self.setUp()
# Addresses accessed as above, but access type changed and sequence jumbled.
self.caches[0].read(5)
self.caches[3].write(6)
self.caches[3].write(6)
self.caches[3].read(8)
self.caches[0].write(0)
self.caches[0].read(5)
self.caches[1].read(1)
self.caches[2].read(6)
self.caches[3].write(7)
self.caches[3].read(3)
self.caches[1].read(7)
self.caches[1].read(8)
self.caches[2].read(8)
self.caches[0].read(7)
self.caches[3].write(7)
self.caches[0].read(8)
self.caches[2].write(2)
self.caches[1].write(5)
self.caches[1].write(7)
# Compute the post-processed statistics.
stats_dict = self.tracker.get_general_stats()
self.assertEqual(stats_dict["addressed_by_one_processor"], 4)
self.assertEqual(stats_dict["addressed_by_two_processors"], 2)
self.assertEqual(stats_dict["addressed_by_more_than_two_processors"], 2)