The CMS software performance at the start of data taking

The CMS software framework (CMSSW) is a complex project evolving very rapidly as the first LHC colliding beams approach. The computing requirements constrain performance in terms of CPU time, memory footprint and event size on disk to allow for planning and managing the computing infrastructure necessary to handle the needs of the experiment. A performance suite of tools has been developed to track all aspects of code performance, through the soft-ware release cycles, allowing for regression and guiding code development for optimization. In this talk, we describe the CMSSW performance suite tools used and present some sample performance results from the release integration process for the CMS software.