Servo rust is a browser engine that got created to leverage the memory safety features of the Rust programming language. This project got installed by Mozilla Research with help from Samsung. The major aim of this project is to come up with a parallel environment.  Here, certain components such as layout, rendering, and image decoding get carried out by isolated tasks.

Servo comes with parallel layout algorithms. These get executed using Rust as well as its HTML5 and CSS3 parsers. Also, it uses GPU acceleration to render pages more smooth and quick. Towards the end of 2014, Servo was already boasting of performance levels that compare with Mozilla's Gecko.

Debugging Servo Rust

The Servo Rust project got built upon thousands of lines of code. For such a project to get developed, you will need to know how you can debug it rightly. Finding the fault is the ideal thing to do in this regard.

You may not be an expert in Software development but you should have some idea about writing codes. Hence, when something goes wrong, you should know where to add some lines of code. This strategy is straightforward as it is smart to know what is going with the code. This requires you to compile every time you seek to know the value of another variable in the program.

Also, when the program crashes, tracing the underlying factor can prove to be a challenge. Doing it the simple way may not be enough as you will need to deploy a stronger tool. This tool could be LLDB in macOS or GDB in Linux.

Using GDB for debugging

Also known as the GNU Project debugger, the GDB grants you access to what is going on within the program which implementing. It could also show you what another program is doing before it crashed.

It suffices to say that the GDB assists you to control the program that is running while you get more data from within the code. For instance, you opt to stop the program when you get to a certain line known as the breakpoint. When this occurs, you may print them to have a feel of the variables contained in the breakpoint scope.

Also, you may trace the code back from the breakpoint. Backtracing implies printing several functions called before you reach the breakpoint. Sometimes the crash suffered by the program may not be a result of the code where it crashed at. It may have occurred earlier and relayed a wrong parameter leading to the crash.

Leveraging on Servo tuning?

One notable thing about Servo motors is that they operate based on continuous current to get to a certain velocity, position, and torque. The amount of current that will get supplied is dependent on the Servo controller depending on the information made available by the encoder about the actual condition of the system. The controller in turn sends the commands to the servo drive.

Tuning a Servo system requires modifying the gains in the motion of the controller to lower the response time of the Servo. The main aim of Servo Tuning is to lower the error that exists between the actual value achieved and the commanded position.

The most popular loop used in Servo tuning is the PID loop in which the P talks about proportional gain, I stands for Integral gain and D stands for derivative gain. A Gain is the ratio of the input to the output. The gains go a long way in determining the extent to which the controller attempts to remediate the errors noted by the feedback device.

The amount of gain enjoyed in the control loop will tell you the restoring force that gets applied to challenge the error that exists between the actual and commanded value.

Last line

The whole idea behind the article can get applied not only to Servo Rust but also to C ++ projects. If you desire to debug Chromium or Firefox, you may use the same strategy. Note that GDB is not compulsory for developers, but, it can be useful for hackers. Certain Servo contributors operate as front-end developers. Knowing what the Servo is all about should help you profitably leverage its potential.