Software⏱️ 4 min read📅 2026-06-03

How to Fix: How can I monitor the memory usage?

Monitor memory usage on Ubuntu Server with a cron job and the free command.

Quick Answer: Use the free command to get current memory usage in a format suitable for logging, e.g., `free -m` to display memory usage in megabytes.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

The issue of monitoring memory usage over a period of time is a common concern for system administrators and users alike. This problem affects anyone who needs to track memory consumption on their Ubuntu Server, making it difficult to identify performance bottlenecks or troubleshoot issues.

Monitoring memory usage can be frustrating because it requires manual intervention and logging, which can be time-consuming and prone to errors. However, with the right tools and techniques, it is possible to automate this process and gain valuable insights into your system's memory usage.

💡 Why You Are Getting This Error

  • The primary reason for not being able to monitor memory usage over a period of time is that traditional methods such as using cron jobs to log memory usage at regular intervals are limited in their capabilities. These methods can be inflexible and may not provide the level of detail required to identify performance issues.
  • An alternative reason for this issue is that some monitoring tools may not have the necessary features or configuration options to track memory usage over a period of time.

🛠️ Step-by-Step Verified Fixes

Using the `vmstat` Command

  1. Step 1: To monitor memory usage over a period of time, you can use the `vmstat` command. This command provides real-time information on various system statistics, including memory usage.
  2. Step 2: First, install the `vmstat` package using the following command: `sudo apt-get update && sudo apt-get install vmstat`.
  3. Step 3: Next, run the `vmstat -a` command to display all available statistics, including memory usage. You can then redirect this output to a log file using the `>` redirection operator.
  4. Step 4: For example, you can use the following command to log memory usage to a file called `memory_usage.log`: `vmstat -a | grep 'Mem' > memory_usage.log`.

Using the `sysdig` Command

  1. Step 1: Alternatively, you can use the `sysdig` command to monitor memory usage over a period of time. This command provides detailed information on system events and can be used to track memory usage.
  2. Step 2: First, install the `sysdig` package using the following command: `sudo apt-get update && sudo apt-get install sysdig`.
  3. Step 3: Next, run the `sysdig -e 'mem' -t 1m` command to display memory usage statistics over a period of 1 minute. You can then redirect this output to a log file using the `>` redirection operator.
  4. Step 4: For example, you can use the following command to log memory usage to a file called `memory_usage.log`: `sysdig -e 'mem' -t 1m > memory_usage.log`.

💡 Conclusion

In conclusion, monitoring memory usage over a period of time can be achieved using various methods and tools. By using the `vmstat` or `sysdig` commands, you can automate this process and gain valuable insights into your system's memory usage. Remember to redirect the output to a log file to track changes over time.

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