To get best performance, create database file using tchmgr command before starting kumo-server. See documents of Tokyo Cabinet for details.
Example:
[on svr1]$ tchmgr create /var/kumodb.tch 1310710
[on svr1]$ kumo-server -v -l svr1 -m mgr1 -p mgr2 -s /var/kumodb.tch