Building an ActionScript Game Server with over 15,000 Concurrent Connections
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The document details the construction of an ActionScript game server capable of handling over 15,000 concurrent connections, addressing various aspects such as server architecture, protocol considerations, and socket implementations. It discusses configurations, the use of ActionScript on both client and server sides, and provides examples and resources for server setup and code implementation. Additional insights are offered, including a case study and performance optimizations for Linux kernel settings.
Building an ActionScript Game Server with over 15,000 Concurrent Connections
- 1. 构建 ActionScript 游戏服务器， 支持超过 15000 并发连接 Building an ActionScript Game Server with over 15,000 Concurrent Connections Renaun Erickson 1
- 2. Basic MMO Game Architecture • Clients • Servers • Databases • Networking 2
- 3. MMO Network Considerations • Protocols (TCP, UDP, HTTP) • Firewalls • Latency • Packet Size • Data Schema 3
- 4. Have to be able to create large number of connections that can send packets at a reasonable rate and bandwidth 4
- 5. Socket Implementations • Check each file descriptor each frame – Select, poll • Slow for large number of connections • OS Optimized – Epoll, kqueue, /dev/poll, pollset, I/O Completion Ports • OS specific fast implementations • Event based libraries – Libevent and libev • Fast for large number of connections • Portable code, hides OS specific implementations 5
- 6. Server Configuration • Tell OS to allow large number of file descriptors • Tell OS how much ram for each file descriptor • Tell OS buffer sizes for network protocols • Tell OS what ports range to use, only 65k ports per IP 6
- 7. Flash on the Client and Server • Many MMOs in China use Flash as the Client • Server naturally has MMO game logic • Put game logic on server for security • Many benefits of using the same language on client and server Is ActionScript on the server possible? 7
- 8. ActionScript on the Server • Flash Player Dissected – Core – VM, Primitives, ActionScript syntax – APIs – C/C++ classes implementing rich Flash Player API and features • Tamarin – Open sourced core parts of the Flash Player – No rich API or features, you have to write them yourself 8
- 9. Tamarin Projects • Thane (part of Whirled SDK by ThreeRings) – http://wiki.whirled.com/Whirled_SDK • Redtamarin (by zwetan and others) – http://code.google.com/p/redtamarin/ • PushButton Engines Network component by Ben Garney – https://github.com/PushButtonLabs/PBNetwork ing 9
- 10. Case Study: SpellTraction Design By: Garth Braithwaite http://www.garthdb.com/ @garthdb 10
- 11. Live Demo and Source Code • http://renaun.com/serveras/test • http://renaun.com/serveras/spelltraction/ • https://github.com/renaun/ActionScriptGa meServerExamples 11
- 12. Server Setup • Game Server – Amazon EC2 Medium Server – 64 bit Ubuntu OS – Running two game instances • Main • Load Test • Load Test Server – Amazon EC2 Medium Server – Custom test scripts 12
- 13. Server Code • Redtamarin – Created ServerSocket.as – libev socket implementation – Compile ActionScript files into ActionScript Byte Code (abc files) – Command line redtamarin shell runs the abc files 13
- 14. Server ActionScript Code function loopHandler():void { if (!ss.listening) ss.listen("10.111.33.190", 12122); else serverBrain.beat(); // Game Tick } var serverDispatcher:SocketServerNerveDispatcher = new SocketServerNerveDispatcher(); var serverBrain:ServerBrain = new ServerBrain(); var serverNerve:ServerNerveSystem = new ServerNerveSystem(serverBrain, serverDispatcher); serverBrain.addNerve(serverNerve); var ss:ServerSocket = serverDispatcher.createServerSocket(serverNerve); ss.loop.add(loopHandler); ss.start(250); 14
- 15. Libev Socket Implementation bool ServerSocketObject::_listen(Stringp host, const int port) { struct socket_io w_accept; StUTF8String hostUTF8(host); const char* hostAddr = hostUTF8.c_str(); if( (w_accept.fd = socket(PF_INET, SOCK_STREAM, 0)) < 0 ) return false; int flags = fcntl(w_accept.fd, F_GETFL, 0); fcntl(w_accept.fd, F_SETFL, (flags > 0 ? flags : 0) | O_NONBLOCK); sockaddr_in addr; memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_addr.s_addr = inet_addr(hostAddr); addr.sin_port = htons(port); int status = bind(w_accept.fd, reinterpret_cast<struct sockaddr *>(&addr), sizeof(addr)); if (status != 0) return false; _socket = w_accept.fd; if (listen(w_accept.fd, 2) < 0) return false; w_accept.socketObject = this; // Initialize and start a watcher to accepts client requests ev_io_init(&w_accept.io, accept_cb, w_accept.fd, EV_READ); ev_io_start(loop_ev, &w_accept.io); ev_loop(loop_ev, 0); return true; } 15
- 16. Linux Kernel Configurations /etc/sysctl.conf net.core.rmem_max = 33554432 net.core.wmem_max = 33554432 net.core.rmem_default = 1048576 net.core.wmem_default = 1048576 net.core.optmem_max = 33554432 net.ipv4.tcp_rmem = 4096 4096 33554432 net.ipv4.tcp_wmem = 4096 4096 33554432 net.ipv4.tcp_mem = 786432 1048576 26777216 net.ipv4.tcp_max_tw_buckets = 360000 net.core.netdev_max_backlog = 30000 net.ipv4.ip_local_port_range = 2048 65535 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_no_metrics_save = 1 net.core.somaxconn = 131072 fs.file-max = 131072 /usr/include/linux/limits.h NR_OPEN = 65536 /etc/security/limits.conf * soft nofile 65535 * hard nofile 65535 16
- 17. Client Code Client Shared Code Server 17
- 18. Q/A [email protected] http://github.com/renaun @renaun http://renaun.com/blog 18