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How to Revert Changes in Git
We make mistakes when developing before or after committing in git. We may revert changes and fix our mistake by using git. Revert entire working tree before committing We can return the entire working tree to the last committed state if we mess up the working tree: $ git reset –hard HEAD Revert changes to…
What are the differences between NUMA architecture and SMP architecture?
NUMA Architecture: Non-Uniform Memory Access architecture. SMP: Symmetric Multiprocessing architecture. In a Symmetric Multiprocessor, the architectural “distance” to any memory location is the same for all processors, i.e. “symmetric”. In a NonUniform Memory Access machine, each processor is “closer” to some memory locations than others; i.e. memory is partitioned among them Asymmetrically. From my understanding,…
Quickly Copying Text to a File
Copying some text to a new file is a common operation on Linux. I usually do this by opening the file with ‘vim’, pasting the text in ‘vim’, and then saving the file. I learned a more efficient and quicker way from my advisor during one discussion with him when I show him some results….
Force Linux to reboot
How to force Linux to reboot when the reboot command does not work. Enable the use of the magic SysRq option: # echo 1 > /proc/sys/kernel/sysrq Reboot the machine: # echo b > /proc/sysrq-trigger Even if you could not log on the system but sshd is working, you can force the Linux to reboot by:…
How to Run a cron Job Every Two Weeks / Months / Days
We may want to run some jobs for every two weeks/months/days… under some situation such as backing up for every other week. In addition, we may add more complex rules for running jobs, e.g. run a command when the load of the server is higher than a certain level. With the help of the shell…
Enabling Debugging with CMake for a C++ Project
When developing a C++ project, debugging is an essential part of the process, as it allows you to identify and fix issues in your code. If you’re using CMake to build your project, it’s crucial to know how to enable debug mode to take advantage of debugging tools like gdb. In this post, we’ll walk…