[Linux] C Shell (csh) pidstat 使用法: Monitor process statistics

Overview

The pidstat command is a useful tool for monitoring individual process statistics in real-time. It provides detailed information about CPU usage, memory consumption, and other performance metrics for running processes, making it invaluable for system administrators and developers who need to optimize performance.

Usage

The basic syntax of the pidstat command is as follows:

pidstat [options] [arguments]

Common Options

• -h: Display the output in a human-readable format.
• -r: Report memory usage statistics.
• -u: Report CPU usage statistics.
• -p <pid>: Specify the process ID to monitor.
• -t: Display statistics for threads.

Common Examples

Here are some practical examples of how to use the pidstat command:

1. Monitor CPU usage for all processes:

   pidstat -u 1
   

   This command will display CPU usage statistics for all processes every second.

2. Monitor memory usage for a specific process:

   pidstat -r -p 1234 1
   

   Replace 1234 with the actual process ID. This will show memory usage statistics for the specified process every second.

3. Monitor both CPU and memory usage:

   pidstat -u -r 1
   

   This command will provide both CPU and memory usage statistics for all processes every second.

4. Monitor thread statistics for a specific process:

   pidstat -t -p 5678 1
   

   Replace 5678 with the desired process ID. This will display thread-level statistics for the specified process every second.

Tips

• Use the -h option to make the output more readable, especially when dealing with large numbers.
• Combine options to get a comprehensive view of process performance; for example, using -u -r together.
• Regularly monitor processes during peak usage times to identify performance bottlenecks.
• Consider redirecting the output to a file for further analysis using pidstat [options] > output.txt.