Jan Wieck wrote: > Bruce Momjian wrote: > > > Now, O_SYNC is going to force every write to the disk. If we have a > > transaction that has to write lots of buffers (has to write them to > > reuse the shared buffer) > > So make the background writer/checkpointer keeping the LRU head clean. I > explained that 3 times now.
If the background cleaner has to not just write() but write/fsync or write/O_SYNC, it isn't going to be able to clean them fast enough. It creates a bottleneck where we didn't have one before. We are trying to eliminate an I/O storm during checkpoint, but the solutions seem to be making the non-checkpoint times slower. -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])
