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perftest.py
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perftest.py
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import time, sys
import psycopg2
from psycopg2.extensions import adapt, register_adapter
class DB(object):
def __init__(self, dbapi):
self.field_order = ('key', 'a0', 'a1', 'a2')
self.connection = None
self.dbapi = dbapi
def connect(self, **kwargs):
self.connection = self.dbapi.connect("dbname='%(dbname)s' user='%(user)s' host='%(host)s'" % kwargs)
self.cursor = self.connection.cursor()
def create_table(self):
self.cursor.execute("""
CREATE TABLE item (
key MACADDR PRIMARY KEY,
a0 VARCHAR,
a1 VARCHAR,
a2 VARCHAR
)
""")
self.cursor.execute("""
CREATE TEMPORARY TABLE temp_item (
key MACADDR PRIMARY KEY,
a0 VARCHAR,
a1 VARCHAR,
a2 VARCHAR
) ON COMMIT DELETE ROWS
""")
def drop_table(self):
self.cursor.execute("""
DROP TABLE item CASCADE
""")
def create_function(self):
self.cursor.execute("""
CREATE OR REPLACE FUNCTION replace_item(items item[]) RETURNS VOID AS $$
BEGIN
FOR i IN COALESCE(array_lower(items,1),0) .. COALESCE(array_upper(items,1),-1) LOOP
UPDATE item SET a0=items[i].a0,a1=items[i].a1,a2=items[i].a2 WHERE key=items[i].key;
END LOOP;
END;
$$ LANGUAGE plpgsql
""")
def drop_function(self):
self.cursor.execute("""
DROP FUNCTION replace_item(data item[]) CASCADE
""")
def drop_rule(self):
self.cursor.execute("""
DROP RULE insert_or_replace ON item CASCADE
""")
def create_rule(self):
self.cursor.execute("""
CREATE RULE "insert_or_replace" AS
ON INSERT TO "item"
WHERE
EXISTS(SELECT 1 FROM item WHERE key=NEW.key LIMIT 1)
DO INSTEAD
(UPDATE item SET a0=NEW.a0,a1=NEW.a1,a2=NEW.a2 WHERE key=NEW.key);
""")
def truncate(self):
self.cursor.execute("TRUNCATE item")
self.cursor.execute("VACUUM FULL ANALYZE")
def begin(self):
self.cursor.execute("BEGIN")
def commit(self):
self.cursor.execute("COMMIT")
def rollback(self):
self.cursor.execute("ROLLBACK")
def insert_items(self, items):
q = "INSERT INTO item (key, a0, a1, a2) VALUES ("
q += "), (".join((", ".join(str(adapt(item[f])) for f in self.field_order)) for item in items)
q += ")"
self.cursor.execute(q)
def update_items_merlin83(self, items):
q = "INSERT INTO temp_item (key, a0, a1, a2) VALUES ("
q += "), (".join((", ".join(str(adapt(item[f])) for f in self.field_order)) for item in items)
q += ")"
self.cursor.execute(q)
q = "DELETE FROM item USING temp_item WHERE item.key=temp_item.key"
self.cursor.execute(q)
q = "INSERT INTO item (key, a0, a1, a2) SELECT key, a0, a1, a2 FROM temp_item"
self.cursor.execute(q)
def update_items_merlin83_2(self, items):
q = "INSERT INTO temp_item (key, a0, a1, a2) VALUES ("
q += "), (".join((", ".join(str(adapt(item[f])) for f in self.field_order)) for item in items)
q += ")"
self.cursor.execute(q)
q = "UPDATE item SET a0=temp_item.a0, a1=temp_item.a1, a2=temp_item.a2 FROM temp_item WHERE item.key=temp_item.key"
self.cursor.execute(q)
def update_items_andres(self, items):
q = "UPDATE item SET a0=i.a0, a1=i.a1, a2=i.a2 FROM "
q += "(VALUES (" + "), (".join(", ".join(str(adapt(item[f])) for f in self.field_order) for item in items) + ")) AS i(key, a0, a1, a2)"
q += " WHERE item.key=i.key::macaddr"
self.cursor.execute(q)
def update_items(self, items):
q = "UPDATE item SET a0=%(a0)s,a1=%(a1)s,a2=%(a2)s WHERE key=%(key)s"
self.cursor.executemany(q, items)
def replace_items(self, items):
q = "SELECT replace_item(ARRAY[("
q += ")::item, (".join((", ".join(str(adapt(item[f])) for f in self.field_order)) for item in items)
q += ")::item])"
self.cursor.execute(q)
class Batch(object):
def __init__(self, limit):
self.batch = []
self.limit = limit
def append(self, sub):
self.batch.append(sub)
return len(self.batch) >= self.limit
def drain(self):
b = self.batch
self.batch = []
return b
def populate(batch, n, batch_receiver):
handled_items = 0
for i in xrange(n):
item = { 'key': '00:00:00:%02x:%02x:%02x' % ((i >> 16) & 0xff, (i >> 8) & 0xff, i & 0xff), 'a0': 'a0 - %06x' % i, 'a1': 'a1 - %06x' % i, 'a2': 'a2 - %06x' % i}
if batch.append(item):
batch_receiver(batch.drain())
handled_items += 1
items = batch.drain()
if items:
batch_receiver(items)
return handled_items
def run_test(item_count, batch_size, db, fn):
affected_items = 0
try:
start_time = time.time()
db.begin()
affected_items = populate(Batch(batch_size), item_count, fn)
db.commit()
elapsed = time.time() - start_time
return affected_items, elapsed
except:
db.rollback()
raise
def run_test_no_transaction(item_count, batch_size, db, fn):
affected_items = 0
try:
start_time = time.time()
affected_items = populate(Batch(batch_size), item_count, fn)
elapsed = time.time() - start_time
return affected_items, elapsed
except:
db.rollback()
raise
def transaction_wrap(db, fn):
def f(*args, **kwargs):
db.begin()
fn(*args, **kwargs)
db.commit()
return fn
def test_insert(item_count, batch_size, db):
truncate(db)
affected_items, elapsed = run_test_no_transaction(item_count, batch_size, db, transaction_wrap(db, db.insert_items))
print "Multi-row insert : %d items inserted in %5.2f seconds averaging %8.2f items/s" %(affected_items, elapsed, affected_items / elapsed)
def test_update(item_count, batch_size, db):
prepopulate(item_count, batch_size, db)
#affected_items, elapsed = run_test(item_count, batch_size, db, db.update_items)
affected_items, elapsed = run_test_no_transaction(item_count, batch_size, db, transaction_wrap(db, db.update_items))
print "executemany() update : %d items updated in %5.2f seconds averaging %8.2f items/s" %(affected_items, elapsed, affected_items / elapsed)
def test_update_andres(item_count, batch_size, db):
prepopulate(item_count, batch_size, db)
affected_items, elapsed = run_test_no_transaction(item_count, batch_size, db, transaction_wrap(db, db.update_items_andres))
print "update_andres : %d items updated in %5.2f seconds averaging %8.2f items/s" %(affected_items, elapsed, affected_items / elapsed)
def test_update_merlin83(item_count, batch_size, db):
prepopulate(item_count, batch_size, db)
affected_items, elapsed = run_test_no_transaction(item_count, batch_size, db, transaction_wrap(db, db.update_items_merlin83))
print "update_merlin83 (i/d/i) : %d items updated in %5.2f seconds averaging %8.2f items/s" %(affected_items, elapsed, affected_items / elapsed)
def test_update_merlin83_2(item_count, batch_size, db):
prepopulate(item_count, batch_size, db)
affected_items, elapsed = run_test_no_transaction(item_count, batch_size, db, transaction_wrap(db, db.update_items_merlin83_2))
print "update_merlin83 (i/u) : %d items updated in %5.2f seconds averaging %8.2f items/s" %(affected_items, elapsed, affected_items / elapsed)
def test_replace(item_count, batch_size, db):
prepopulate(item_count, batch_size, db)
db.create_function()
affected_items, elapsed = run_test_no_transaction(item_count, batch_size, db, transaction_wrap(db, db.replace_items))
db.drop_function()
print "replace_item() procedure : %d items replaced in %5.2f seconds averaging %8.2f items/s" %(affected_items, elapsed, affected_items / elapsed)
def test_rule_insert(item_count, batch_size, db):
truncate(db)
db.create_rule()
affected_items, elapsed = run_test_no_transaction(item_count, batch_size, db, transaction_wrap(db, db.insert_items))
db.drop_rule()
print "Multi-row insert_or_replace: %d items inserted in %5.2f seconds averaging %8.2f items/s" %(affected_items, elapsed, affected_items / elapsed)
def test_rule_replace(item_count, batch_size, db):
prepopulate(item_count, batch_size, db)
db.create_rule()
affected_items, elapsed = run_test_no_transaction(item_count, batch_size, db, transaction_wrap(db, db.insert_items))
db.drop_rule()
print "Multi-row insert_or_replace: %d items replaced in %5.2f seconds averaging %8.2f items/s" %(affected_items, elapsed, affected_items / elapsed)
def truncate(db):
db.truncate()
def prepopulate(item_count, batch_size, db):
try:
db.truncate()
db.begin()
populate(Batch(batch_size), item_count, db.insert_items)
db.commit()
except:
db.rollback()
raise
def run():
db = DB(psycopg2)
db.connect(dbname='psm', host='localhost', user='psm')
try:
db.begin()
db.drop_table()
db.commit()
except psycopg2.ProgrammingError, e:
print >>sys.stderr, "Removing old tables:", e
db.rollback()
db.create_table()
test_insert(50000, 500, db)
test_update(50000, 500, db)
test_update_andres(50000, 500, db)
test_update_merlin83(50000, 500, db)
test_update_merlin83_2(50000, 500, db)
test_replace(50000, 500, db)
test_rule_insert(50000, 500, db)
test_rule_replace(50000, 500, db)
db.drop_table()
if __name__ == '__main__':
run()