Re: Postgres refusing to use >1 core

12.05.11 06:18, Aren Cambre написав(ла):

> Using one thread, the app can do about 111 rows per second, and it's
> only exercising 1.5 of 8 CPU cores while doing this. 12,000,000 rows /
> 111 rows per second ~= 30 hours.

I don't know how I missed that. You ARE maxing out one cpu core, so
you're quite right that you need more threads unless you can make your
single worker more efficient.

And the problem is my app already has between 20 and 30 threads. Something about C#'s PLINQ may not be working as intended...

Have you checked that you are really doing fetch and processing in parallel? Dunno about C#, but under Java you have to make specific settings (e.g. setFetchSize) or driver will fetch all the data on query run. Check time needed to fetch first row from the query.

Best regards, Vitalii Tymchyshyn