On Mon, Apr 2, 2012 at 8:16 PM, Simon Riggs <si...@2ndquadrant.com> wrote: > Agreed, though I think it means the fsync is happening on a filesystem > that causes a full system fsync. That time is not normal.
I don't know what you mean. It looks like there are two cases where this code path executes. Either more than 16 clog files are being flushed by the SimpleLRUFlush() during a checkpoint or a dirty page is being evicted by SlruSelectLRUPage(). I don't know that 16 is so crazy a number of clog files to be touching between checkpoints any more on a big machine like this. The number of clog files active concurrently in pgbench should be related to how quickly xids are being used up and how large the database is -- both of which are pretty big in these tests. Perhaps the 16 should have been raised to 32 when CLOGShmemBuffers was raised to 32. -- greg -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
