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Archive for the ‘中文文章’ Category.
Virtualbox支持客户机和宿主机之间共享目录，但是根据版本不同，会有些问题。例如对于3.1.x版本，windows XP host和Debian guest组合下，VBox自己的共享目录（写入）性能极差甚至报错（本人遇到）。其实，在客户机和宿主机之间共享文件的还有一些其他方式，例如可以通过ftp或samba，二者都支持所有操作系统下的共享，但是相比之下samba更具优点，因为在Windows和Linux下都可以把Samba共享目录映射为本地磁盘目录。
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1. Change the default keyboard shortcuts to ctrl+c and ctrl+v. They are more common shortcuts on most OS.
2. Highlighting texts and Middle mouse button clicking will do copy/paste. These are similar to the operation in PuTTY where right mouse button click is used.
目前全球有约10亿台计算机，每台按100Wh实际功率计算，总功率为1亿千瓦时。也就是说每小时耗电量为1亿千瓦。按计算机一天工作10小时计算，一天全球消耗总电量为10亿千瓦时。世界超大型水电站（如三峡电站）在汛期全部机组开动发电量不过4亿千瓦时（参见）。意味着我们需要2-3个这样的超大水电站全负荷供电才能满足基本需求。我们知道，建设一个这样的电站要耗费数以亿计的金钱和数十年的人工。但是，如果作为程序员，往往可以轻易地提高编码质量和运行效率以达到节省计算时间的目的，变相地节约了宝贵的能源，有利于保护地球环境。我觉得如果所有程序员都朝这个方向努力，每天节省一个三峡电站的电量是完全可能的。
Bash下可以使用”cd -”来实现在当前目录和上一次访问的路径间切换。 如果我们需要回退多级目录怎么实现呢？
1. apt-get install mpich2 (remove other implementation to prevent trouble)
2. create .mpd.conf file under home dir ~/ , add a line “password=qwert” (replace qwert with any other texts)
3. create a hostfile or machine file (e.g. mpd.hosts) with node names listed one per line. (this file can be in any folder)
4. start mpd. There is a script shipped with mpich2 “mpdboot”. It accept some options. “mpdboot -f mpd.hosts -n #” with #<= number of nodes listed in mpd.hosts file. This command will start mpd on all the nodes if ssh or rsh is set correctly (without password).
5 use mpdtrace to verify the node names (nodes having been added to the mpd ring, ready to be used in the following mpirun calls).
6 mpirun -np N -host node1,node2 ./program (it’s not necessary to use all the nodes in the ring, but some of them is fine)
By default Notepad2 add a .txt extension to the file name when you save a newly created file. For files already having extensions, this will not be done. However, this is sometimes annoying if you often create files which do not use txt as extension although they are actually plain text files. I think this is almost a daily work for programmers. To cancel this feature, there are two ways. First, when you save the newly created file, simply add quote symbols around the file name like “new_file”, then the file will be save without an extension or with any extension you give. This trick also works for the Windows Notepad program. Another hack is to modify notepad2.ini, there you can create a new section (if it’s not there already) named “[settings2]“. The settings given in this section will override the default behavior. Then add an entry “DefaultExtension=”, yeah just leave nothing behind the equal sign, no suffix will be appended automatically then. There are more options for the customized section, see here.
经常在C++程序中加入中文注释，但是如果使用不同的编辑器，编码识别或转换不当，会导致非ASCII字符乱码。
VS中编译有时很费时间，如果有声音提示编译结果会比较方便，这样就不用总是查看输出窗口了。根据这篇文章，VS声音提示并不在VS软件设置中，而是在系统的“控制面板”中。打开“声音和音频设备”点击“声音”选项卡，在“程序事件”列表下找到“Microsoft Visual Studio”，就可以为编译成功、编译失败和取消编译等事件指定声音了。
呵呵，最近有幸结识了一位傲慢且无知的俄罗斯女人。她看人的眼神绝似沙皇接见群臣，居高临下且无可判断焦距。但其实我知道她的无知也是超一流的。:）全当路过吧！
I’ve tried to download many freeware or trial versions in order to convert lots of html files downloaded from internet into some Ebook format, such as chm or pdf. Unfortunately and surprisingly none of them is satisfactory. Some cracked commercial software do exist, but I don’t like to be a victim of Trojan.
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