let create
?(host=Host.tmp_on_localhost)
?queue ?name ?(wall_limit=`Hours 24.) ?(processors=1) ?(email_user=`Never)
?(shell="/usr/bin/env bash")
program =
`Long_running (
"PBS",
`Created {host; program; queue; name;
email_user; shell; wall_limit; processors}
|> serialize)