def bigmark():
"""Follow ~20M references between 10M objects."""
logging.basicConfig(
level=logging.DEBUG,
format='%(asctime)s %(levelname)s [%(name)s] %(message)s')
oid_count = 10 * 1000 * 1000
k = 10000
log.info("Generating random references.")
marker = TreeMarker()
marker.add_refs([(0, i * k) for i in range(20)])
refcount = 20
for i in xrange(1, oid_count):
if random() < 0.2:
refs = []
for j in range(randint(0, 20)):
refs.append((i * k, randint(0, oid_count) * k))
marker.add_refs(refs)
refcount += len(refs)
log.info("Generated %d references.", refcount)
log.info("Finding reachable objects.")
pass_count = marker.mark([0])
log.info("Found %d reachable objects in %d passes.",
marker.reachable_count, pass_count)
def bigmark():
"""Follow ~20M references between 10M objects."""
logging.basicConfig(
level=logging.DEBUG,
format='%(asctime)s %(levelname)s [%(name)s] %(message)s')
oid_count = 10 * 1000 * 1000
k = 10000
log.info("Generating random references.")
marker = TreeMarker()
marker.add_refs([(0, i * k) for i in range(20)])
refcount = 20
for i in xrange(1, oid_count):
if random() < 0.2:
refs = []
for j in range(randint(0, 20)):
refs.append((i * k, randint(0, oid_count) * k))
marker.add_refs(refs)
refcount += len(refs)
log.info("Generated %d references.", refcount)
log.info("Finding reachable objects.")
pass_count = marker.mark([0])
log.info(
"Found %d reachable objects in %d passes.",
marker.reachable_count, pass_count)
def _traverse_graph(self, cursor):
"""Visit the entire object graph to find out what should be kept.
Sets the pack_object.keep flags.
"""
log.info("pre_pack: downloading pack_object and object_ref.")
marker = TreeMarker()
# Download the list of object references into the TreeMarker.
# Note the Oracle optimizer hints in the following statement; MySQL
# and PostgreSQL ignore these. Oracle fails to notice that pack_object
# is now filled and chooses the wrong execution plan, completely
# killing this query on large RelStorage databases, unless these hints
# are included.
stmt = """
SELECT
/*+ FULL(object_ref) */
/*+ FULL(pack_object) */
object_ref.zoid, object_ref.to_zoid
FROM object_ref
JOIN pack_object ON (object_ref.zoid = pack_object.zoid)
WHERE object_ref.tid >= pack_object.keep_tid
ORDER BY object_ref.zoid, object_ref.to_zoid
"""
self.runner.run_script_stmt(cursor, stmt)
while True:
rows = cursor.fetchmany(10000)
if not rows:
break
marker.add_refs(rows)
# Use the TreeMarker to find all reachable objects.
log.info("pre_pack: traversing the object graph "
"to find reachable objects.")
stmt = """
SELECT zoid
FROM pack_object
WHERE keep = %(TRUE)s
"""
self.runner.run_script_stmt(cursor, stmt)
while True:
rows = cursor.fetchmany(10000)
if not rows:
break
marker.mark(oid for (oid,) in rows)
marker.free_refs()
# Upload the TreeMarker results to the database.
log.info(
"pre_pack: marking objects reachable: %d",
marker.reachable_count)
batch = []
def upload_batch():
oids_str = ','.join(str(oid) for oid in batch)
del batch[:]
stmt = """
UPDATE pack_object SET keep = %%(TRUE)s, visited = %%(TRUE)s
WHERE zoid IN (%s)
""" % oids_str
self.runner.run_script_stmt(cursor, stmt)
batch_append = batch.append
for oid in marker.reachable:
batch_append(oid)
if len(batch) >= 1000:
upload_batch()
if batch:
upload_batch()
def _traverse_graph(self, cursor):
"""Visit the entire object graph to find out what should be kept.
Sets the pack_object.keep flags.
"""
log.info("pre_pack: downloading pack_object and object_ref.")
marker = TreeMarker()
# Download the list of object references into the TreeMarker.
# Note the Oracle optimizer hints in the following statement; MySQL
# and PostgreSQL ignore these. Oracle fails to notice that pack_object
# is now filled and chooses the wrong execution plan, completely
# killing this query on large RelStorage databases, unless these hints
# are included.
stmt = """
SELECT
/*+ FULL(object_ref) */
/*+ FULL(pack_object) */
object_ref.zoid, object_ref.to_zoid
FROM object_ref
JOIN pack_object ON (object_ref.zoid = pack_object.zoid)
WHERE object_ref.tid >= pack_object.keep_tid
ORDER BY object_ref.zoid, object_ref.to_zoid
"""
self.runner.run_script_stmt(cursor, stmt)
while True:
rows = cursor.fetchmany(10000)
if not rows:
break
marker.add_refs(rows)
# Use the TreeMarker to find all reachable objects.
log.info("pre_pack: traversing the object graph "
"to find reachable objects.")
stmt = """
SELECT zoid
FROM pack_object
WHERE keep = %(TRUE)s
"""
self.runner.run_script_stmt(cursor, stmt)
while True:
rows = cursor.fetchmany(10000)
if not rows:
break
marker.mark(oid for (oid, ) in rows)
marker.free_refs()
# Upload the TreeMarker results to the database.
log.info("pre_pack: marking objects reachable: %d",
marker.reachable_count)
batch = []
def upload_batch():
oids_str = ','.join(str(oid) for oid in batch)
del batch[:]
stmt = """
UPDATE pack_object SET keep = %%(TRUE)s, visited = %%(TRUE)s
WHERE zoid IN (%s)
""" % oids_str
self.runner.run_script_stmt(cursor, stmt)
batch_append = batch.append
for oid in marker.reachable:
batch_append(oid)
if len(batch) >= 1000:
upload_batch()
if batch:
upload_batch()
