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How to use Perf Command explained through practical examples ?

How to use Perf Command explained through practical examples ?

Perf is a Linux performance monitoring tool used to measure CPU, memory and other hardware and software performance metrics. It provides insight into performance bottlenecks, allowing users to identify and correct issues. Perf is designed to be extensible and customizable, allowing users to create custom metrics and reports. 

Here at Fixwebnode, we shall look into using Perf command.

 

How to use Perf Command ?

The Perf command is used to measure CPU, memory and other hardware and software performance metrics. It provides insight into performance bottlenecks, allowing users to identify and correct issues. To use Perf command, users must first install the Perf package from their Linux distribution's package manager. 

Once installed, users can access the Perf command by typing “perf” in the terminal. This will display the list of available options and arguments. The most commonly used options are:

  • * stat – This option is used to collect performance metrics such as CPU and memory usage
  • * record – This option is used to record performance data over a specified period of time
  • * report – This option is used to generate a report from the collected performance data

 

Perf Command Syntax

The syntax for the Perf command is as follows:

$ perf [OPTIONS] [COMMAND]

Where OPTIONS are the options chosen from the list above and COMMAND is the command to be executed.

 

For example, to record performance data for the "ls" command, the syntax would be:

$ perf record ls

 

Examples of using Perf Command ?

Let's look at some examples of how to use the Perf command.

 

1. To collect performance data for the "ls" command, use the following syntax:

$ perf stat ls

2. To collect performance data over a specified period of time, use the following syntax:

$ perf record -e cycles -a -g -- sleep 10

This will collect performance data for 10 seconds.

 

3. To generate a report from the collected performance data, use the following syntax:

$ perf report

 

[Need help in fixing Linux System issues ? We are here. ]

 



CONCLUSION

In this tutorial, we covered how to use Perf command, provided practical examples and explained the syntax. With this knowledge, users can now measure CPU, memory and other hardware and software performance metrics. This can help users identify performance bottlenecks and correct issues.

 

How to fix Perf Command Not Found in Linux ?

The Perf command is a performance monitoring tool for Linux systems that can be used to collect and analyze data about the system’s performance. The command is commonly used to identify potential performance issues and bottlenecks.

Unfortunately, if you try to run the Perf command on your Linux system and get the error “Perf command not found”, it can be a bit of a headache to figure out how to resolve the issue.

Before you begin, make sure that you have root access to your Linux system.

 

1.  Check if the perf package is installed:

On Ubuntu / Debian:

$ sudo apt install linux-tools-common linux-tools-$(uname -r)

On RedHat / CentOS:

$ sudo yum install perf

 

2. Download package manually

If you are using an older version of Linux, you may need to install the package manually. Download the source code of the perf package from the official website and extract the archive.

 

3. Install Package

Change the working directory to the extracted folder and run the following commands:

$ make
$ sudo make install

 

4.  If the perf package is already installed and the Perf command is still not found, it may be a problem with the PATH environment variable.

To fix this, edit the ~/.bashrc file and add the following line:

export PATH=$PATH:/usr/local/bin

 

5. Reload .bashrc file

Finally, reload the ~/.bashrc file by running the command:

$ source ~/.bashrc

Now the Perf command should be accessible from the terminal.

 


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