-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 01/23/08 14:49, Mike Kuhar wrote: > > Subject: Re: Where do you put your swap partition? > > On 2008-01-23T15:17:29-0500, Mike Kuhar wrote: >> Most things stated in this chain are true. But a couple notes. First, a >> swap partition is not the same as a normal partition, i.e. ext2 or ext2. >> That is, in Window's speak, it's not formatted. Process chunks that are >> swapped in and out of swap does not go through the filesystem manager. > The >> kernel directly manages that space. It treats that disk space as a raw >> disk. Much faster than going through the read/writes to a normal file. > You >> can create a swap file, but that's much slower than swap space, because it >> has to go through the file system. > > These two threads do not suggest there is any significant performance > difference between swap file and swap partitions: > http://lkml.org/lkml/2005/6/28/427 > http://groups.google.com/group/cwelug/browse_thread/thread/c7d44b3d414f7da2 > > ---------------------------------- > > If that's meaningful for you, than by all means use a swap file.
Denying *direct* evidence that swap file is faster? Are you sure you aren't a Young Earth Creationist? > But going > through the filesystem is never the fastest way to disk. I know this is /ipse dixit/ (appeal to authority), but when Andrew Morton says "The kernel generates a map of swap offset -> disk blocks at swapon time and from then on uses that map to perform swap I/O directly against the underlying disk queue, bypassing all caching, metadata and filesystem code.", I believe him. > If that were the > case, then Oracle would never offer the ability to use a disk in raw mode > for speed. Oracle must support a *wide* variety of OSs, and has had to do so for many years. > You don't have to configure this way, but it is offered for > speed. But then again, a home user never taxes a system like a business > system. If you are more comfortable using a swap file, then use it. - -- Ron Johnson, Jr. Jefferson LA USA "I'm not a vegetarian because I love animals, I'm a vegetarian because I hate vegetables!" unknown -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHl758S9HxQb37XmcRAuA8AJ9GdsTfIqdWpEDupV4cZ5uHccH2TQCaApOk X6QOcSqLRCuVZ1/+qLEgwLk= =pp8q -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
