To understand the importance of goroutines, we must first understand concurrency and parallelism. As we all know, it’s the CPU, or more precisely, its core, that executes our code, and one CPU core can handle only one instruction at a time. It’s OK back in the days when people still…

Based on this Stack Overflow answer Before the introduction of Go modules, the file structure of local Go projects were like // an executable $GOPATH/github.com/you/project1 -> $GOPATH/github.com/you/project1/package_main -> $GOPATH/github.com/you/project1/package1 -> $GOPATH/github.com/user_a/project1/package2 // imports project3 -> $GOPATH/github.com/user_a/project1/package3 // an executable $GOPATH/github.com/user_b/project2 -> $GOPATH/github.com/user_b/project2/main_package -> $GOPATH/github.com/user_b/project2/package_a -> $GOPATH/github.com/user_b/project2/package_b…

Despite what’s said about Go slices in this blog post, if you really know what dynamic arrays are internally, you should immediately recognize the resemblance between Go’s slices and a dynamic array. To be more precise, a typical dynamic array implementation is like typedef struct { int *array…

Based on https://www.calhoun.io/how-do-interfaces-work-in-go/ Coming from a C background, I did not understand the importance of interfaces at first, but as it turns out, in some way, interfaces can make object oriented programming a lot easier. What confused me about Go’s interface was that if we still have to write the…

Test your HTTP server with ApacheBenchmark (shipped along with apache2) like ab -n 100 -c 10 -rkl http://127.0.0.1:1234 Check out man ab to find out what each of these options means. An similar alternative to ab is wrk.

Install packages using pacman # update and yes to all questions sudo pacman -Syyu # install a package, apache in this case sudo pacman -S apache

Based on this medium post Long story short, when you use epoll, the kernel keeps relevant data in the kernel space, monitors files in the interest list behind the scene and sends back only a short list of ready descriptors. On the contrary, poll/select is more like an on-demand service…

Based on The Linux Programming Interface Today, if you are writing a server (HTTP daemon) program, you should be expecting tens of thousands of connections already, and oftentimes, after these connections are established, most of them will just remain alive for the minutes to come to save unnecessary hand-shakings. But…

Based on this Stack Overflow answer and this Stack Exchange answer Just like cmp and jl, the call and ret instructions accomplish many tasks using a single instruction so it’s a bit hard to see what they are doing (if you don’t know about it already). If you take a…