Messages in this thread | | | Date | Mon, 12 Nov 2001 23:30:56 +0100 | From | Ragnar Kjørstad <> | Subject | Re: File System Performance |
| |
On Mon, Nov 12, 2001 at 02:14:59PM -0800, Linus Torvalds wrote: > > Seems not the case with gnu tar : write isn't even called once on the fd > > returned by open("/dev/null",...). In fact a "grep write" on the strace > > output is empty in the "tar cf /dev/null" case. Every file in the tar-ed > > tree is stat-ed but no-one is read-ed. > > And what's the _point_ of the optimization? I've never heard of a "tar > benchmark"..
Sure - it's called "amanda" :-)
I believe amanda run the backup once to /dev/null first to estimate the size of the dataset, so it can make better use of the available tapes.
-- Ragnar Kjørstad Big Storage - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |