Re: Synchronized Scan update

Jeff Davis <pgsql@j-davis.com> writes:
> I agree that ss_report_loc() doesn't need to report on every call. If
> there's any significant overhead I agree that it should report less
> often. Do you think that the overhead is significant on such a simple
> function?

One extra LWLock cycle per page processed definitely *is* a significant
overhead ... can you say "context swap storm"?  I'd think about doing it
once every 100 or so pages.
        regards, tom lane