开发工具:
文件大小: 559kb
下载次数: 0
上传时间: 2015-12-09
详细说明： Title: The core of the big data solutions -- Map. Author: pengwenwei address: No.17-18 of XiangGangbatang Community, Xiangtan City of Hunan Province, China. Language: c++ Platform: Windows, linux Technology: Perfect hash algorithm Level: Advanced Description: A high performance map algorithm Section MFC c++ map stl SubSection c++ algorithm License: (GPLv3) Map is widely used in c++ programs. Its performance is critical to programs' performance. Especially in big data and the scenarios which can't realize data distribution and parallel processing. I have been working on big data analysis for many years in telecommunition and information security industry. The data analysis is so complicated that they can't work without map. Especially in information security industry, the data is much more complicated than others. For example, ip table, mac table, telephone numbers table, dns table etc. Currently, the STL map and Google's hash map are the most popular maps. But they have some disadvantages. The STL map is based on binary chop, which causes a bad performance. Google Hash map has the best performance at present, but it has probability of collision. For big data analysis, the collision probability is unacceptable. Now I would like to publish pwwMap. It includes three different maps for different scenarios: 1. Memory Map(memMap): It has a good access speed. But its size is limited by memory size. 2. Harddisk Map(diskMap): It utilizes hard disk to store data. So it could accept much more data than memory map. 3. Hashmap(hashMap): It has the best performance and a great lookup speed, but it doesn't have 'insert' and 'delete' functionality. MemMap and diskMap could be converted to hashMap by function memMap2HashMap and diskMap2HashMap. According to the test result, my algorithms' collision probability is zero. About performance, memMap has a comparable performance with google, and hashMap's performance is 100 times better than Google's hashmap. In summary, pwwhash are perfect hash algorithms with zero collision probability. You can refer to following artical to find the key index and compress algorithm theory: http://blog.csdn.net/chixinmuzi/article/details/1727195 Source code and documents: https://sourceforge.net/projects/pwwhashmap/files/?source=navbar ...展开收缩
(系统自动生成,下载前可以参看下载内容)
下载文件列表
相关说明
- 本站资源为会员上传分享交流与学习,如有侵犯您的权益,请联系我们删除.
- 本站是交换下载平台，提供交流渠道，下载内容来自于网络，除下载问题外，其它问题请自行百度。
- 本站已设置防盗链，请勿用迅雷、QQ旋风等多线程下载软件下载资源，下载后用WinRAR最新版进行解压.
- 如果您发现内容无法下载，请稍后再次尝试；或者到消费记录里找到下载记录反馈给我们.
- 下载后发现下载的内容跟说明不相乎，请到消费记录里找到下载记录反馈给我们，经确认后退回积分.
- 如下载前有疑问，可以通过点击"提供者"的名字，查看对方的联系方式，联系对方咨询.
