Tom Lane wrote:
Scott Carey <[EMAIL PROTECTED]> writes:
Which brings this back around to the point I care the most about:
I/O per second will diminish as the most common database performance limiting
factor in Postgres 8.4's lifetime, and become almost irrelevant in 8.5's.
Becoming more CPU efficient will become very important, and for some, already
is. The community needs to be proactive on this front.
This turns a lot of old assumptions on their head, from the database down
through the OS and filesystem. We're bound to run into many surprises due to
this major shift in something that has had its performance characteristics
taken for granted for decades.
Hmm ... I wonder whether this means that the current work on
parallelizing I/O (the posix_fadvise patch in particular) is a dead
end. Because what that is basically going to do is expend more CPU
to improve I/O efficiency. If you believe this thesis then that's
not the road we want to go down.
regards, tom lane
What does the CPU/ Memory/Bus performance road map look like?
Is the IO performance for storage device for what ever it be, going to
be on par with the above to cause this problem?
Once IO performance numbers start jumping up I think DBA will have the
temptation start leaving more and more data in the production database
instead of moving it out of the production database. Or start
consolidating databases onto fewer servers . Again pushing more load
onto the IO.
