I strongly disagree with the statement that a 30-minute job launch time is unacceptable. This ignores the benefits of doing detailed diagnostics during job launch that dramatically reduce the unexpected job failure rate and improve performance reproducibility. Launching a job on 100K processes of Blue Gene/P took around 15 minutes but it was absolutely worth it compared to similarly sized machines that booted much faster but which had much lower reliability and reproducibility. The time the user loses for booting jobs is more than made up for by the reduction in faults by virtue of detecting hardware issues before MPI_INIT is called.