On 5-3-2007 21:38 Tom Lane wrote:
Keep in mind that Arjen's test exercises some rather narrow scenarios; IIRC its performance is mostly determined by some complicated bitmap-indexscan cases. So that "30% slower" bit certainly doesn't represent an across-the-board figure. As best I can tell, the decisions the planner happened to be making in late June were peculiarly nicely suited to his test, but not so much for other cases.
True, its not written as a database-comparison-test, but as a platform-comparison test. As I showed you back then, there where indeed querytypes faster on the final version (I still have that database of executed queries on dev and 8.2 rc1), especially after your three patches. Still, its a pitty that both the general performance and scalability seem to be worse on these platforms.
Best regards, Arjen
