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Something like this:

gpus=2

find files |
  parallel -j +$gpus '{= $_ = slot() > '$gpus' ? "foo" : "bar" =}' {}

Less scary:

  parallel -j +$gpus '{=
      if(slot() > '$gpus') {
        $_ = "foo"
      } else {
        $_ = "bar"
      }
    =}' {}

-j +$gpus Run one job per CPU thread + $gpus

{= ... =} Use perl code to set $_.

slot() Job slot number (1..cpu-threads+$gpus).

Something like this:

gpus=2

find files |
  parallel -j +$gpus '{= $_ = slot() > '$gpus' ? "foo" : "bar" =}' {}

Less scary:

  parallel -j +$gpus '{=
      if(slot() > '$gpus') {
        $_ = "foo"
      } else {
        $_ = "bar"
      }
    =}' {}

-j +$gpus Run one job per CPU thread + $gpus

{= ... =} Use perl code to set $_.

slot() Job slot number (1..cpu_threads+$gpus).

Something like this:

gpus=2

find files |
  parallel -j +$gpus '{= $_ = slot() > '$gpus' ? "foo" : "bar" =}' {}

Something like this:

gpus=2

find files |
  parallel -j +$gpus '{= $_ = slot() > '$gpus' ? "foo" : "bar" =}' {}

Less scary:

  parallel -j +$gpus '{=
      if(slot() > '$gpus') {
        $_ = "foo"
      } else {
        $_ = "bar"
      }
    =}' {}

-j +$gpus Run one job per CPU thread + $gpus

{= ... =} Use perl code to set $_.

slot() Job slot number (1..cpu-threads+$gpus).

Something like this:

gpus=2

find files |
  parallel -j +$gpus '{= $_= slot() > '$gpus' ? "foo" : "bar" =}' {}

Something like this:

gpus=2

find files |
  parallel -j +$gpus '{= $_ = slot() > '$gpus' ? "foo" : "bar" =}' {}