Today I received the new Dell S3219D monitor ordered on Cyber Monday. I bought it for my Mac Mini 2012 - it’s running Ubuntu 18.10, because the macOS X became too slow on the old hardware. Although the monitor worked after connecting it to Mac Mini through HDMI cable, the resolution was only 1920x1200, not the QHD 2560x1440. I decided to fix this problem.
This post is a basic exercise of geometry and image processing.
In C++11, C++ introduced built-in support for threads
std::thread. Since then, starting a new thread in C++ is as easy as defining an object. However, dynamically terminating a running C++ thread is still very tricky, especially for the joined/detached thread. There are plenty of discussions of this topic, and the conclusion is that
Just like many people, I also own a very limited number of stocks. Although I tried my best to massage my portfolio(based on my guess, feeling and luck) last year, its year-end return was only about 3.5%. Compared to the S&P500’s 12% return, the poor performance shocked me. So I decided to study some formal computational stock analysis techniques. This post is the summary of what I learnt and developed. For the complete code, please refer to
stock_analysis in my Github.
This post introduces a Python class
Command that can run a shell command with a time limit - the command will be killed after timer expires. This is implemented by
This post explains how to implment a ring buffer that can be shared between multiple processes. For the simplicity and efficiency, shared memory is used to store the ring buffer. A read/write lock is also developed to sync the inter-process buffer read/write operations. The source code can be found on my GitHub channel.
This is a summary of decoding Linux userspace process corefiles using GDB. For how to enable coredump in Linux, please refer to HOWTO enable core-dumps.
When debugging network packets in Click, usually the packets are printed to screen as hex string:
Since CentOS 7(or RedHat 7) is quite different from CentOS 6.x, most notes online for installing TFTP server in CentOS are obsolete already. This post not only summarizes the procedure of installing & configuring TFTP server, but also introduces a general strategy of configuring network services in CentOS 7.
This post introduces how to configure and use syslogd-compatible syslog tools. These tips should be supported by rsyslog, but rsyslog-specific commands are not covered.