I have mentioned some time ago about using Simulating ASH to solve performance issue in Oracle 9i database.
According to some restrictions I have to customize it a little bit and than I agreed with Kyle Hailey that I will publish it as a new version of S-ASH. A new project has been created on SourceForge to keep a repository and this new code and installation instruction can be find here.
Please feel free to post any comments or remarks. I have some idea about potential enhancement of that tool but I'm open for any new too.