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moxi - a memcached proxy with energy and pep Dependencies: -- libevent, http://www.monkey.org/~provos/libevent/ (libevent-dev) -- libmemcached, http://tangent.org/552/libmemcached.html To compile moxi, after you got the dependencies: ./autogen.sh ./configure make For example, if libevent is installed in /opt/local, you'd do... ./autogen.sh ./configure --with-libevent=/opt/local make Using moxi: In moxi terminology, "upstream" are the memcached clients, and "downstream" are the memcached servers. moxi -z <port=<memcached_host:memcached_port(,*)>> moxi will listen on the given port and accept connections from upstream memcached clients. It will forward requests to downstream memcached servers running on memcached_host:memcached_port. For example... moxi -z 11211=my_memcached_server:11222 Above, moxi will listen on port 11211 and forward requests to the memcached running on my_memcached_server that's listening on port 11222. You can list more than one memcached_host:memcached_port, separated by commas. For example... moxi -z 11211=memcached_1:11211,memcached_2:11211 The default downstream port is 11211, so you can also just use... moxi -z 11211=memcached_1,memcached_2 If you have some memcached servers running on the same server, but on different ports, you can put moxi in front of them with something like... moxi -z 11211=server:11222,server:11233 To get more command line usage info: moxi -h Tests: # To test that moxi still behaves like memcached # and passes all the tests that memcached passes... # make test # To test moxi in a simple proxy topology of... # client <-> moxi <-> memcached # ./t/moxi.pl # To test moxi in a chained proxy topology of... # client <-> moxi <-> moxi <-> moxi <-> memcached # ./t/moxi.pl chain # To test moxi in a fanout topology of... # client <---> moxi <---> memcached # |-> memcached # |-> memcached # |-> memcached # ./t/moxi.pl fanout # To test moxi in a fanout and back in again topology of... # client <---> moxi <---> moxi <-> memcached # |-> moxi <-| # |-> moxi <-| # |-> moxi <-| # ./t/moxi.pl fanoutin # To test moxi proxy cases... # ./moxi -z 11333=localhost:11311 -t 1 python t/moxi_mock.py More notes: If using Linux, you need a kernel with epoll. Sure, libevent will work with normal select, but it sucks. epoll isn't in Linux 2.4 yet, but there's a backport at: http://www.xmailserver.org/linux-patches/nio-improve.html You want the epoll-lt patch (level-triggered). If you're using MacOS, you'll want libevent 1.1 or higher to deal with a kqueue bug. Also, be warned that the -k (mlockall) option to memcached might be dangerous when using a large cache. Just make sure the memcached machines don't swap. memcached does non-blocking network I/O, but not disk. (it should never go to disk, or you've lost the whole point of it) The memcached website is at: http://www.danga.com/memcached/