Starting with version 24 RenderMan includes an entirely new diagnostics sub-system, re-written from the ground up to incorporate live, configurable statistics. See RenderMan page here.

To continue to use the legacy statistics, check Render Statistics option in your RenderMan RIS ROP's Options | Statistics Tab:

By default, it uses the Disk File's path and base name. 

You can view the output xml file with any web browser.  See Legacy Diagnostics for more information.

• File: Generate a .stats file 
• XML File: Generate an XML file for viewing in a browser
• IO Trace Filename: A detailed input/output report saved as XML
• Stylesheet: The stylesheet used for formatting an XML file
• Shader Profile: Profile for custom shader output
• Displace Ratios: Suppress reporting of displacement values when divided by the max displacement fall inside this range
• Maximum Displacement: The number of warnings for displacement values to print before stopping, 0 means all values reported
• Enable Texture Statistics: Allows finer grained reporting of texture usage
• Track Asset Objects: Tracks scene entities