echo '### test memfree'
### test memfree
  parallel --memfree 1k echo Free mem: ::: 1k
Free mem: 1k
  stdout parallel --timeout 3 --argsep II parallel --memfree 1t echo Free mem: ::: II 1t
parallel: SIGTERM received. No new jobs will be started.
parallel: Waiting for these 0 jobs to finish. Send SIGTERM again to stop now.
echo '**'
**