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import gevent.monkey
gevent.monkey.patch_all()
import logging
logging.basicConfig()
#logging.getLogger("sqlalchemy.pool").setLevel(logging.INFO)
from sqlalchemy import event
import random
import sys
from sqlalchemy import create_engine
import traceback
engine = create_engine('mysql+pymysql://scott:tiger@localhost/test',
pool_size=50, max_overflow=0)
@event.listens_for(engine, "connect")
def conn(*arg):
print "new connection!"
def worker():
while True:
conn = engine.connect()
try:
trans = conn.begin()
for i in range(5):
conn.execute("SELECT 1+1")
gevent.sleep(random.random() * 1.01)
except:
#traceback.print_exc()
sys.stderr.write('X')
else:
conn.close()
sys.stderr.write('.')
def main():
for i in range(40):
gevent.spawn(worker)
gevent.sleep(3)
while True:
result = list(engine.execute("show processlist"))
engine.execute("kill %d" % result[-2][0])
print "\n\n\n BOOM!!!!! \n\n\n"
gevent.sleep(5)
print(engine.pool.status())
main()
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