gistfile1.py

import execnet, gevent

# Use boto to get images ip
from boto.ec2.connection import EC2Connection
conn = EC2Connection('secret', 'secret')
my_ami = conn.get_all_instances()
my_instances = my_ami[1].instances
servers = []
for instance in my_instances:
    servers.append(instance.public_dns_name)

pypaths = {
    'ec2_pypath':'/home/ubuntu/kenny/bin/python'
}
mine_script = """
    # some process i run
    
    channel.send(callback_stmt)
"""

gws = execnet.Group()
pool = Pool(10) # 1 per server
    
ec_inst_count = 1

for server in servers:
    if server.startswith("ec2"):
        gws.makegateway("ssh=" + "username" + "@"+server+"//id=" + "ec2_inst_" + str(ec_inst_count) + '//python=' + pypaths["ec2_pypath"])
        ec_inst_count += 1


script = mine_script % param
for gw in gws:
    gw_id = gw.id
    channel = gws[gw_id].remote_exec(script)
    channel.setcallback(cb) # assuming you have a callback function cb

# Run from commandline
if __name__ == '__main__':
    run()