Re: why we need both the collector & buffer process

Sorry to say that I cannot see which process is used to do checkpoints. I just see two main functions.
pgstat_recvbuffer(): this function is to receive the information from the postgres .this function is the main body of buffer process
pgstat_min():this function is to do the job of getting information from the buffer process and writing them to the file . and this is the main body of collector process.
Any function else to do the checkpoint job?
Best Wishes!
William
Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> wrote:
=?gb2312?q?William.Jiang?= wrote:
>
> hi,all hackers of postgres
>
> when postmaster start as a service . another two
> processes(collector & buffer ) start their work at the same
> time.
>
> I have read the code and I am wondering why we need two
> processes to do the work. I think one process can work as
> well. Are there something special you considered when you
> developed this feature?

One collects statistics for the pg_stat tables, and the other does
checkpoints. They are different functions.

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