p2p协议中gnutella protocol 传输效率低下，gnutella based clients的market share也逐渐减少，早已是irrelevent的东东。同样具有search功能的eDonkey/eMule network在大文件共享上要强得多。 但现在国外在p2p Streaming上实用的东东PeerCast (open source)却是基于gnutella协议的，用于audio streamming效果很不错, video效果感觉一般。 国外还有几个propreitery protocol的免费p2p streaming软件：p2pRadio是open source的用java写的，StreamerP2P是一个closed source产品。 在VOD或realtime broadcast之类的流媒体应用上真正有前途的的还是象bittorrent之类的高效swarming技术。除了大家提到的coolstreaming外, 国内还有几个类似的产品－－据我所知这方面这几个国人的产品是走在了前列。 另外许多人正在研究增强bittorrent本身，例如搜索功能，与RSS结合等。现在已经有几个这方面的东东。 还有一个突破性的产品是swarmstream–号称具有接近BT的throughput但又能保证数据包的接收顺序–这是streaming技术梦寐以求的功能。虽然$5000一套SDK, 还是物有所值。
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VPS stands for virtual private Server, a techology to divide a server into multiple “virtual machines” and each of the “virtual server” can run its own operating system as if it’s a standalone server. VPS is mainly used for Web hosting. It can also be used toestablished “sandbox” or for demo/testing purposes etc. The technology [...]
谢老蔡：） 关于大文件共享，我刚想起一个更好的办法： 用 gmail + roamdrive. roamdrive是一个可以把一个hotmail或gmail账户当成你的网上硬盘的软件–原理是把大的文件切割成小块，每块变成一个email,这样就能突破gmail每个邮件10MB的限制。 我建立了一个新的gmail账号，pku8808@gmail.com ;需要上载或下载文件的同学去http://www.roamdrive.com 当漏一个最新的roamdrive软件，然后就可以直接从windows 把文件拖动到gmail里去，或者从gmail拖动到本地硬盘。
After extensive search, reading, comparing and trying, finally I limited my choices to the following three: – exo platform – Liferay – uportal All of them have JSR 168 support, which is my basic choosing criteria. Still they all have pros and cons: – exo platform: the most technically advanced; has all the buzz words [...]
One of my old posts, with some thoughts apparently not true or outdated in today’s view; just put it here to fill the space – The technical platform selection first is determined by what kinds of resources/expertise the developemnt team have. – Language by itself: PHP is a scripting language, like VB script used in [...]
