Manage OAR jobs asynchronously

[pmorillon]

When we define a lot of jobs, like this :

# Define OAR jobs for each clusters
#
sites.each do |site|
  next if %w{ grenoble }.include? site['uid']
  logger.info "Site #{site['uid']}"
  site['clusters'].each do |cluster|
    starttime = Time.now
    next if %w{ sagittaire }.include? cluster
    job = {
      :site      => site['uid'],
      :queue     => "besteffort",
      :name      => "lstopo on #{cluster}",
      :resources => %{{cluster='#{cluster}'}/cpu=1/core=2},
      :walltime  => "00:05:00",
      :command   => "lstopo",
      :stdout    => "OAR_lstopo_#{cluster}_%jobid%.txt"
    }
    xp.define_job job
    logger.info "Cluster #{cluster} - #{Time.now - starttime}s"
  end
end

It can take a long time :

grid5000-xp-lstopo|⇒ cap oar:status
 ** Site lille
 ** Cluster chimint - 13.487054s
 ** Cluster chinqchint - 1.442277s
 ** Cluster chirloute - 1.105555s
 ** Site luxembourg
 ** Cluster granduc - 1.151326s
 ** Cluster petitprince - 0.613598s
 ** Site lyon
 ** Cluster hercule - 7.251447s
 ** Cluster orion - 1.121573s
 ** Cluster taurus - 0.768739s
 ** Site nancy
 ** Cluster graphene - 2.363813s
 ** Cluster graphite - 0.678187s
 ** Cluster griffon - 0.707291s
 ** Site nantes
 ** Cluster econome - 0.906521s
 ** Site reims
 ** Cluster stremi - 2.474238s
 ** Site rennes
 ** Cluster paranoia - 1.607192s
 ** Cluster parapide - 0.742778s
 ** Cluster parapluie - 0.646265s
 ** Site sophia
 ** Cluster sol - 2.382062s
 ** Cluster suno - 0.666874s
 ** Site toulouse
 ** Cluster pastel - 2.034113s
  * 2014-10-12 16:29:35 executing `oar:status'
 ** Job "lstopo on chimint" 1484992@lille status : terminated
 ** Job "lstopo on chinqchint" 1484993@lille status : terminated
 ** Job "lstopo on chirloute" 1484994@lille status : terminated
 ** Job "lstopo on granduc" 51505@luxembourg status : terminated
 ** Job "lstopo on petitprince" 51506@luxembourg status : terminated
 ** Job "lstopo on hercule" 730275@lyon status : terminated
 ** Job "lstopo on orion" 730276@lyon status : terminated
 ** Job "lstopo on taurus" 730277@lyon status : terminated
 ** Job "lstopo on graphene" 595946@nancy status : terminated
 ** Job "lstopo on graphite" 595947@nancy status : terminated
 ** Job "lstopo on griffon" 595948@nancy status : terminated
 ** Job "lstopo on econome" 2460@nantes status : terminated
 ** Job "lstopo on stremi" 170531@reims status : terminated
 ** Job "lstopo on paranoia" 694400@rennes status : terminated
 ** Job "lstopo on parapide" 694401@rennes status : terminated
 ** Job "lstopo on parapluie" 694402@rennes status : terminated
 ** Job "lstopo on sol" 704188@sophia status : terminated
 ** Job "lstopo on suno" 704189@sophia status : terminated
 ** Job "lstopo on pastel" 421545@toulouse status : terminated

Would be better to define jobs asynchronously...