How to use debugging tools in golang

Golang is a very popular programming language at present. It has many advantages such as efficient memory management mechanism, rapid development speed and excellent readability, and has been widely used and paid attention to. However, just like other programming languages, Golang also has some bugs and problems. At this time, developers need to use debugging tools to help solve the problem. This article will introduce some commonly used Golang debugging tools and how to use them to solve problems.

1. gdb debugger

The gdb debugger is a debugging tool of the GNU project and can be used to analyze the status of the program during execution. For Golang developers, the gdb debugger can help them locate the cause of program crashes or deadlocks. To use the gdb debugger, you need to install GDB. The command is as follows:

$ sudo apt-get install gdb

Next, use the gdb debugger to start the Golang program. The command is as follows:

$ gdb your_go_program_name

The Golang program will run in the gdb console. At this time you can use some gdb commands to debug the Golang program, such as:

• break command: Set a breakpoint at the specified line of code to stop the program here. Waiting for debugging.
• runCommand: Run the Golang program and stop at the first breakpoint.
• nextCommand: Execute the code line by line, but will not enter the function.
• stepCommand: Execute the code line by line and enter the function.
• info variablesCommand: View the values ​​of all variables.
• printCommand: View the value of a single variable.

In addition, you can also use the quit command to exit the GDB debugger.

2. pprof performance analyzer

pprof performance analyzer is a tool used to analyze the performance of Golang programs. It can provide a variety of statistics, including CPU usage, memory allocation, and more. To use the pprof analyzer, you need to insert the analysis object into the program. The command is as follows:

import “net/http/pprof”

func main() {

pprof.Index(http.DefaultServeMux)
//接下来启动http服务...

}

Then you can use the browser to open the http://localhost:8080/debug/pprof path to view the performance. Statistical data.

3. Delve debugger

The Delve debugger is a debugging tool based on Golang and is also Golang’s native debugging tool. The Delve debugger can well support code editing, recompilation, debugging and other functions. Installing the Delve debugger requires the Go programming language.

The command to install the Delve debugger is as follows:

$ go get -u github.com/derekparker/delve/cmd/dlv

Then, use the following command to start the Delve debugger for Golang program debugging:

$ dlv debug your_go_program_name

The Golang program will be in the Delve debugger in operation. At this time, you can use some commands of Delve to debug:

• break command: Set breakpoints on specific lines of code.
• continueCommand: Let the program continue running until the next breakpoint.
• nextCommand: Run the next line of code.
• stepCommand: Run the next line of code and enter the function.
• variablesCommand: Display the values ​​of all variables.

4. gops command line tool

gops is a command line tool that can be used to analyze running Golang programs. It can easily view the current status of the Golang program, including coroutines, stacks and other information used in program running. To use the gops command line tool, you need to install gops first. The command is as follows:

$ go get github.com/google/gops

Then, on the server running the Golang program, use the following command to start gops:

$ gops

Then you can use another terminal Use the PID of the gops process in the window to query. For example, use the following command to get the current status of the program:

$ gops stack your_golang_program_pid

The above are some commonly used Golang debugging tools and how to use them. Through these tools, developers can better locate problems in Golang programs and speed up repairs.

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