>
> >> - Could we use mmap:ing of files at a higher level then
> >> src/backend/strorage/ipc/ipc.c to get even better performance
> >> and cleaness?
> >
> >Yes, we could use mmap() to map the actual files. I will post time
> >timings on this soon.
>
> I do not think this will be a practicable solution, since it would mean the whole db
> has to mmap'ed. This means there has to be enough virtual memory to hold
> the complete database, or at least one table at a time. Or do I understand this wrong ??
We can map parts of the table, even in 8k chunks. However, looking at
my sequential scan timing tests, it would be slower.
--
Bruce Momjian | 830 Blythe Avenue
maillist@candle.pha.pa.us | Drexel Hill, Pennsylvania 19026
+ If your life is a hard drive, | (610) 353-9879(w)
+ Christ can be your backup. | (610) 853-3000(h)