Curt Sampson <[EMAIL PROTECTED]> writes: > On Sun, 24 Oct 2004, Tom Lane wrote: >> Considering that the available numbers suggest we could win just a few >> percent...
> I must confess that I was completely unaware of these "numbers." Where > do I find them? The only numbers I've seen that directly bear on the question is the oprofile results that Josh recently put up for the DBT-3 benchmark, which showed the kernel copy-to-userspace and copy-from-userspace subroutines eating a percent or two apiece of the total runtime. I don't have the URL at hand but it was posted just a few days ago. (Now that covers all such copies and not only our datafile reads/writes, but it's probably fair to assume that the datafile I/O is the bulk of it.) This is, of course, only one benchmark ... but lacking any measurements in opposition, I'm inclined to believe it. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend