Russell Coker <russell@xxxxxxxxxxxx> wrote: > On Friday 17 March 2006 00:35, "Mauro Mozzarelli" <mmkernel@xxxxxxxxxxxx> > wrote: > > >> > Incidentally such a large swap space will not do you any good in most > > >> > usage scenarios. > > >> > > >> Three words: "suspend to disk". > > > > I use it for "tmpfs" > There are situations where machines can perform very well with a tmpfs > that is significantly larger than RAM. There was one time that one of my > machines with 512M of RAM needed a 6G tmpfs and gave really good > performance with 6G of swap. > There are also some applications that have a working set which is far > smaller than the full allocated memory space and which perform well when > they are mostly swapped out. Exactly. Plus disk (even expensive, high-end ones) are /s l o w/. You need to put enough RAM into the machine for what it needs, in which case you use swap mostly for whatever load spikes run over that, and you care enough not to let OOM take over... and that is completely unpredictable, unless you have a very detailed knowledge of the expected load, so any "swap is X times RAM" advise is bogus. But then again, disk is cheap, and you have to tell people /something/... -- Dr. Horst H. von Brand User #22616 counter.li.org Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513 -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
