Swap config in fly.toml is not working

1

I’ve configured my fly.toml as follows:

[[vm]]
  memory = '512mb'
  cpu_kind = 'shared'
  cpus = 1
  swap_size_mb = 512

But nothing happens as you can see on top output:

Captura de Tela 2025-04-09 às 22.22.01
Captura de Tela 2025-04-09 às 22.22.011480×208 160 KB

Can anyone help me?

2

Move swap_size_mb = 512 outside of [[vm]]; generally this means to put it near the top of the file.

3

It worked. You’re the best. Thanks!

4

Hi @rubys I just noticed when my machine was near capacity, eg 256MB with only ~4MB free and I ssh into it, it’s extremely sluggish. Is that expected? I thought the swap would lend more memory when it was low.

5

Yes but swap space is disk storage which is orders of magnitude slower than RAM. You’re likely experiencing thrashing :slight_smile:

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6

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