YoHub

A lightweight, asynchronous event-driven network application framework in C++.

Features

• Reactors with worker pool. YoHub supports multiple reactors, each reactor will deliver its active events to the worker pool for execution. Reactor and worker pool are both configurable that allow you to build your robust network application.
• Asynchronous model. The asynchronous programming model is inspired from kylin, yohub only notifies the client after the completion of I/O operations. Since the event loop is separated from the worker pool, edge-triggered readiness notification model is chosen for yohub. Nevertheless, edge-triggered readiness notification makes real-time response be possible and makes event handling be more efficient when cooperated with worker pool.
• Thread safe. Synchronous id (sync-id for short) is introduced to yuhub. Each sockfd is associated with such a sync-id, and each sync-id is binded to a consistent thread. In this way, yohub is able to reduce the usage of synchronization primitives (ie. mutex lock), thus has improved the throughput.
• Smart pointer for connections. For most scenarios, yohub uses shared_ptr to automatic memory management, which is inspired from muduo. YoHub takes advantage of smart pointers which can help us take care of the life cycle of those asychronous connections, and has greatly reduced our programming burden.

Performance

YoHub is designed to be a high-performance network application framework, which can be used to solve the C100K problem. The benchmark pragram is token from the libevent-1.4.14b distribution, modified to compatible with the event pool in yohub. Both libevent and yohub are configured to use the epoll interface and run on a Core4 Quad CPU at 2.5GHz with Ubuntu 12.04 operating system.

• 100 active clients.

• 1000 active clients.

The benchmark program takes the paramter -n equals to -w, which means every client will be notified to read and wirte. The report of our benchmark shows that yohub has lower costs than libevent-1.4.14b. With the increment of the file descriptor, this advantage can be obviously seen in above pictures.

Usage

To use yohub, boost library is required to be installed in your machine. After that:

$ git clone git@github.com:kedebug/yohub.git
$ cd yohub
$ cmake . && make

Please see the files under yohub/demo/ directory for further usage.

License

The MIT License (MIT)

Copyright (c) 2014 kedebug

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.