Phillip Susi wrote: > Denis Vlasenko wrote: >> You mean "You can use aio_write" ? > > Exactly. You generally don't use O_DIRECT without aio. Combining the > two is what gives the big win.
Well, it's not only aio. Multithreaded I/O also helps alot -- all this, say, to utilize a raid array with many spindles. But even single-threaded I/O but in large quantities benefits from O_DIRECT significantly, and I pointed this out before. It's like enabling a write cache on disk AND doing intensive random writes - the cache - surprizingly - slows whole thing down by 5..10%. /mjt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
