zlacker

>>hugodu+(OP)
"Firecracker's RAM footprint starts low, but once a workload inside allocates RAM, Firecracker will never return it to the host system."

Firecracker has a balloon device you can inflate (ie: acquire as much memory inside the VM as possible) and then deflate... returning the memory to the host. You can do this while the VM is running.

https://github.com/firecracker-microvm/firecracker/blob/main...

>>rgbren+ig
Yes, we use this at CodeSandbox for reclaiming memory to the host (and to reduce snapshot size when we hibernate the VM).