How to make Debian artificially use 4 GB of RAM?
Jul 8, 9:06am

To artificially make your Debian system use 4 GB of RAM, you can use a simple memory stress test. The easiest way is to use the stress-ng tool, which is designed for this purpose.

Steps to Use stress-ng:

  1. Install stress-ng (if not already installed):

    bash
    sudo apt update
sudo apt install stress-ng

  2. Run stress-ng to Allocate 4 GB of RAM:

    bash
    stress-ng --vm 1 --vm-bytes 4G --vm-keep
    • --vm 1: Spawn 1 worker to allocate memory.
    • --vm-bytes 4G: Allocate 4 GB of virtual memory.
    • --vm-keep: Keep the memory allocated until the process is manually stopped.

  3. Stop the Process: Press Ctrl+C to stop the process and release the memory.

Alternative: Use dd to Allocate Memory

If you don't want to install stress-ng, you can use dd to allocate memory:

bash
dd if=/dev/zero of=/dev/shm/fill bs=1M count=4096
  • This writes 4 GB of zeros to a file in /dev/shm (shared memory), effectively using 4 GB of RAM.
  • To release the memory, delete the file: 
    bash
    rm /dev/shm/fill

Notes:

  • Ensure your system has at least 4 GB of available RAM (check with free -h).
  • These methods are temporary and do not permanently modify system behavior.
Jul 8, 9:06am

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