Curt Sampson <[EMAIL PROTECTED]> writes: > I see the OS issues related to mapping that much memory as a much bigger > potential problem.
I see potential problems everywhere I look ;-) Considering that the available numbers suggest we could win just a few percent (and that's assuming that all this extra mechanism has zero cost), I can't believe that the project is worth spending manpower on. There is a lot of much more attractive fruit hanging at lower levels. The bitmap-indexing stuff that was recently being discussed, for instance, would certainly take less effort than this; it would create no new portability issues; and at least for the queries where it helps, it could offer integer-multiple speedups, not percentage points. My engineering professors taught me that you put large effort where you have a chance at large rewards. Converting PG to mmap doesn't seem to meet that test, even if I believed it would work. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly