All I was trying to achieve is to limit I/O rate done by pg_dump. The script is a very simple pipe rate limitter and nothing more: it reads input, but outputs data no more than at rate specified. I guess it helps because even if pg_dump outputs data at 20 mb/sec, the script won't be able to read it at rate higher than output rate. Pipe buffer is not infinitive, so pg_dump output rate and hard disk reads become almost equal the input rate of my perl script. On Wed, 25 Jan 2006 11:21:58 -0500 Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > Years ago there was some experimentation with dump-rate throttling logic > inside pg_dump itself --- there's still a comment about it in pg_dump.c. > The experiment didn't seem very successful, which is why it never got to > be a permanent feature. I'm curious to know why this perl script is > doing a better job than we were able to do inside pg_dump. -- Evgeny Gridasov Software Engineer I-Free, Russia
