OK, running the latest patch. Observations:
1. Confirmed that time for count(*) on narrow sets is greatly improved:
A real easy way to show this off is:
select count(*) from generate_series(1,(10^6)::integer);
with about a 60% drop in time on my XP box.
2. Did ISAM style record iteration over relatively large (50k records)
bill of materials. This was previous test where I reported no
performance gain...for a single user (n=1). For n=6, I am seeing about
a 20% reduction in the overall running time of the test, and a greatly
improved overall responsiveness of the server while running the test.
I tested this by doing select * from medium_sized_table while 6 backends
were busy feeding records to the ISAM app. While pg under 0 load might
serve the table in one second, with the n=6 test running the time might
(on win32) take 5 minutes. On linux, the worst case time was around
1/(n*2). Qingqing's patch brings win32 much closer to linux!
3. A pl/pgsql function stuck in a empty loop is unkillable except by
killing the process on the server, which cycles the entire server. This
was the behavior before the patch, btw.
I ran tests for about an hour, randomly killing/canceling backends
without any problems.
Merlin
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
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