Re: [pgsql-hackers-win32] Help with tuning this query (with
Greg Stark <[email protected]>
| Newsgroups | gmane.comp.db.postgresql.performance,gmane.comp.db.postgresql.devel.win32 |
|---|---|
| Organization | The Emacs Conspiracy; member since 1992 |
| Message-ID | <[email protected]> |
"Dave Held" <[email protected]> writes: > > What would be really neato would be to use the rtdsc (sp?) or > > equivalent assembly instruction where available. Most processors > > provide such a thing and it would give much lower overhead and much > > more accurate answers. > > > > The main problem I see with this would be on multi-processor > > machines. (QueryPerformanceCounter does work properly on > > multi-processor machines, right?) > > I believe QueryPerformanceCounter() already does this. This would be a good example of why selectively quoting the part of the message to which you're responding to is more useful than just blindly echoing my message back to me. Already does what? Use rtdsc? In which case using it would be a mistake. Since rtdsc doesn't work across processors. And using it via QueryPerformanceCounter would be a non-portable approach to using rtdsc. Much better to devise a portable approach that works on any architecture where something equivalent is available. Or already works on multi-processor machines? In which case, uh, ok. -- greg ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings