dynamic-res.nf

#!/usr/bin/env nextflow 

Channel
     .fromPath('hello.txt')
     .map { [it, it.size()] }
     .set { input_ch }

process foo {
  memory { sz < 1_000_000 ? 2.GB : 8.GB }
  input:
  set file(x), val(sz) from input_ch
  """
  you_command --input $x
  """
}

You mentioned that:

Tho, I'm not loving it because it requires to fetch the file size separately. Needs to improved it to directly get it from the process.

— Paolo Di Tommaso (@PaoloDiTommaso) June 7, 2018

This works as well, would that be any better or did you have something else in mind to be able to do it from the config side?

#!/usr/bin/env nextflow 

input_ch = Channel.fromPath('hello.txt')

process foo {
  memory {x.size() < 1_000_000 ? 2.GB : 8.GB}
  input:
    file(x) from input_ch
  script:
  """
  you_command --input $x
  """
}