On Fri, Mar 9, 2012 at 7:04 PM, Heikki Linnakangas <heikki.linnakan...@enterprisedb.com> wrote: > Here's an updated patch. It now only loops once per segment that a record > crosses. Plus a lot of other small cleanup.
Thanks! But you forgot to attach the patch. > I've been doing some performance testing with this, using a simple C > function that just inserts a dummy WAL record of given size. I'm not totally > satisfied. Although the patch helps with scalability at 3-4 concurrent > backends doing WAL insertions, it seems to slow down the single-client case > with small WAL records by about 5-10%. This is what Robert also saw with an > earlier version of the patch > (http://archives.postgresql.org/pgsql-hackers/2011-12/msg01223.php). I > tested this with the data directory on a RAM drive, unfortunately I don't > have a server with a hard drive that can sustain the high insertion rate. > I'll post more detailed results, once I've refined the tests a bit. I'm also doing performance test. If I get interesting result, I'll post it. Regards, -- Fujii Masao NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
