Nine Rivers

The download link of this version on the Mozilla webpage has broken. But you can find it here.

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. [...]

Both Linux Bash and Windows DOS support random number generation. The random number is ‘stored’ in a system environment variable named “RANDOM” (I believe this variable links to a script to generate the actual random numbers on both systems), use it in the same way as you use other ENV variables.  E.g.

This document demonstrates how we could run client-server software via SSH. The main purpose of using this technique relies on that on most HPC servers most of the IP ports are nromally blocked except for the SSH port 22. SSH tunneling settings in PuTTY In this case, the server port 8888 is mapped to the [...]

According to this thread, LAMMPS has no API document available for developers, which is a pity! Similar discuss can be found for Gromacs here, which tells there is no API document neither. Both of them are powerful simulation codes and can be used as libraries, but apparently this is not the encouraged usage. Although in [...]

When I update WP automatically at backend, I often get an error “Fatal error: Allowed memory size of …” to say the memory usage is beyond a limit. The solution is simple. SSH to the server and edit the wp-config.php as following,

在使用非母语的时候，往往是最最口语的东西不知道怎么翻译过去。今天突然要检索对钩这个英文词，一时想不起来，查了词典才知道应该是“check mark”，我还以为是“correction mark”呢。每天学一点吧！

在中国买电子品一项必做的功课就是“鉴别真伪”。因为除了极少数规模大的商家，都不能百分之百相信货物的来源。或许这也是在享受低价格所付出的额外代价。今年回去买了一个索爱的手机，据说此型号没有在中国发行，但是销量却不错。因此在购买前上网仔细地做了功课。对于所配耳机的真假，网上有不少文字介绍，可以一直没找到图片对比，在买到手机时候却无意间在淘宝的一家商店发现了详细的真假对比图。真的佩服商家为了提高自己销量不惜暴露“行业内幕”的勇气。让我不禁感叹，自由竞争真是个好东西！