-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 10/06/10 18:43, Paul H. Hargrove wrote:
> When the file is on a real (not tmpfs or other ramdisk) I am 95% certain > that this is an artifact of the Linux swapper/pager behavior which is > thinking it is being smart by "swapping ahead". Even when there is no > memory pressure that requires swapping, Linux starts queuing swap I/O > for pages to keep the number of "clean" pages up when possible. I believe you can tweak that behaviour through the VM subsystem using /proc/sys/vm/swappiness, it defaults to 60 but lower values are meant to make the kernel less likely to swap out applications and instead concentrate on reclaiming pages from the page cache. cheers, Chris - -- Christopher Samuel - Senior Systems Administrator VLSCI - Victorian Life Sciences Computational Initiative Email: sam...@unimelb.edu.au Phone: +61 (0)3 903 55545 http://www.vlsci.unimelb.edu.au/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkwR0fcACgkQO2KABBYQAh8sEACggnFKMQIVummW21teI9yBqqNt T4AAnjMSfOFONLyANjgso7kO0VAH3zi7 =X3AE -----END PGP SIGNATURE-----