Go で syscall.Getrusage() を超えて詳細なプロセス情報を取得する方法

Process Details Retrieval from PID in Go: Beyond syscall.Getrusage()

In Linux systems, maintaining a list of PIDs for running processes is common. However, extracting detailed information from these PIDs can be challenging. While syscall.Getrusage() is available, it may not provide the desired results.

Delving into the BASH Alternative

To obtain comprehensive process details, consider leveraging the BASH command ps -p $PID. By default, it displays essential information such as:

• PID: Process identifier
• TTY: Controlling terminal (if applicable)
• TIME: CPU time utilized
• CMD: Command that initiated the process

Enhancing Details with -o Options

Adding the -o flag with specific pairs enables you to gain granular insights. For instance, the command:

ps -p $PID -o pid,vsz=MEMORY -o user,group=GROUP -o comm,args=ARGS

reveals:

• PID and MEMORY (virtual size)
• USER, GROUP, and COMMAND (including arguments)

Tips for Enhanced Output

• To enhance readability, list the args option last as it typically has the most extensive output.
• Separate the pairs for each -o flag with a comma.
• Consider using a terminal with wider columns to accommodate the whitespace padding.
• Alternatively, you can format the output using tools like awk or grep.

Conclusion

By harnessing the capabilities of the ps command, you can effectively retrieve detailed information from process IDs, expanding your options beyond syscall.Getrusage(). This knowledge empowers you with greater control and understanding of your system's processes.

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