Re: AIO vp...

Posted in 1998

Art S. Kagel — Mon, 14 Sep 1998 13:19:05 -0400 — source: Informix-list mailing list archive (1991-1998)

Arun Shastry wrote: > > SUNIL S. SINGH wrote: > > > Hi all !!! > > > > I have a little doubt here abt AIO vp. > > One of the informix manual says tht IDS uses kernel AIO (kio) I/o method, > > ie performing I/O through operating system, if chunk is UNIX raw device > > and it relies on AIO vp for performing I/O directly if chunk is UNIX > > cooked file. > > > > How far is it correct ?? > > I think it is other way round. > > > > IDS uses kernel AIO only on raw devices ONLY if the OS supports it. > All I/O on cooked files is via AIO VP's. Actually some ports without kernel asynch I/O support (notably the DG/UX port for one) implement KAIO using the KAIO thread directly anyway. Art S. Kagel