Kevin J. Barker Kei Davis Darren J. Kerbyson Performance modeling in action: Performance prediction of a Cray XT4 system during upgrade. 1-8 2009 IPDPS http://dx.doi.org/10.1109/IPDPS.2009.5161098 conf/ipps/2009 db/conf/ipps/ipdps2009.html#BarkerDK09