Arnold can generate a log reporting all the steps needed to render an image and any warnings and errors encountered by the renderer. This log also provides detailed statistics that are useful for debugging, optimizing, and benchmarking renders. Note that an individual log file will be saved for each frame of animation that has been rendered.The Arnold log provides detailed statistics that are useful for debugging, optimizing and benchmarking renders. It is the first thing to examine should you encounter errors and usually the first information to send to support.
Log to File
If enabled a log is written to the specified file.
Log Verbosity
Limits the number of warning messages (of a similar type) that are sent to the log.
Log To Console
Enables logging to the console.