In recent times, I have talked to a lot of people and have seen a few questions again and again on how to progress in this field. In this article, we are going to see these questions and what I think their answers are. These are my personal views. What should I learn to shift
When you work with Linux and memory you must have heard the term swap memory. In this article, we are going to see how swap memory affects the latencies of your system, and should you keep them or not? What is a swap memory? It is a memory space that is made available separately to
The operating system has many mechanisms to operate on memory and using it in a proper way, one of them is page faults. In this article, we will look at what is a page fault and you should keep a track of it properly. What is a page fault? A page fault is an exception
The first draft of DHCP was written in October 1993. Lets time travel and go to a time where there is no DHCP. Lets have a look at the why you need DHCP. It is very important as it provide the machines their identity to be on the network grid. DHCPD is a server for
In recent times, I was working with Redis clusters which have very high throughput. While doing this we came across a problem which was Redis bgsave was taking a lot of memory sometimes almost as the same memory as the data present in the memory. In this small writeup, we will see why this happened.
Recently while working with one of the databases I came across a method that is widely used by many databases to take a snapshot of the memory into a disk. One of the most famous that you have heard of is Redis. The method is called copy on write. Let’s see what is a copy
In this article, we are going to start learning system programming by first of all creating a copy program like cp using low-level IO functions and not the standard IO functions. Now first let’s see what is system programming and what is low-level IO functions in C. System Programming: System programming aims at producing software
BPF also known as Berkeley Packet Filters was introduced first in 1992 by Steven McCanne and Van Jacobson in their paper The BSD packet filter: A New architecture for user-level packet capture. In this paper, they presented about BPF architecture and how it interfaced with the rest of the system and a new mechanism for
Monitoring is very important when you want your systems to work properly. Monitoring helps you identify the issues while they are happening or before them. So it is very important to implement your monitoring properly. Let’s see what is black box monitoring. Now when you see any issue how you should approach your debugging. First
In linux environment when you run any piece of code, any application or software. The piece of code actually maps to the some set of instructions in kernel level. To see those instructions that are being executed for that piece of code we can use this tool called strace. We will see what system calls