Thanks for the insight James. Have you been in touch with Dave Edwards? We could use some items written in this area...
On Thu, 2005-01-20 at 09:23 +0100, James Jacobsson wrote: > It is also an opinion of tuning.. > > How agressively Linux uses the swap is determined by > /proc/sys/vm/swappiness > If you set this to 100, linux will try and swap out everything to the > swap. (Except the kernel, since its not swappable). Set it to 0, and > Linux will only swap when you run out of physical ram. > > The size of the swap should _always_ be determined by the applications > you are running on the server. For example, a server only running > Apache, will live quite happily with 512MB of RAM and no swap at all. > > Also, the amount of memory a process consumes isn't the size of its VM, > but the size of the number of pages it has written or read to/from. > Stats for this can be found in /proc/[pid]/stats (You'll haveto look > up the syntax, as I cant recall it right now) > Why? Because Linux supports shared libraries, on-demand paging and > shared memory. > > /James > > > On Jan 20, 2005, at 12:27 AM, Mark Miller wrote: > > > On Wed, 2005-01-19 at 23:53 +0100, Carles Pina i Estany wrote: > > > >> On Jan/20/2005, Les Bell wrote: > >>> > >>> Carles Pina i Estany <[EMAIL PROTECTED]> wrote: > >>> > >>>>> > >>> I remember some questions about Swap size, that I think that are > >>> confusing, like "which is the best recomended size for swap?" with > >>> answers like "double as RAM", "same size as RAM", etc. etc. etc. > >>> << > >>> > >>> I don't believe there is a definitive answer to this, only a huge > >>> number of > >>> differing opinions, many of which are based on oral history and old > >>> wives > >> > >> Everything about this topic is a opinion, but not some rules in some > >> "old" Kernels (2.0 or 2.2, I remember that i have read some problems > >> with less swap than RAM memory for some algorithms). But not today! > > > > You are correct Carles, this is indeed an area of opinion. The items on > > swap that you ask about do indeed assume the older opinion of you > > should > > have two times your RAM as swap. Even in the early days this was > > largely opinion. Recently I have even heard of people looking to drop > > the swap partition completely. For now the older "wisdom" is what the > > test relies on. > > > > Thank you Les for the insight as well. I am glad to see people on this > > list stepping up to help fill in the technical gaps. I would encourage > > all people on the list to bring up any technical issues that they find > > and have such discussions among all of us. Your information is heard > > and > > we at LPI are actively working to make sure that any input is answered > > and used on the tests when it can be. > > > > I look forward to a day when this is a high volume list and I learn > > something technical from it daily! > > > > Thanks Carles for taking the time and effort to start this thread... > > > > -- > > Mark Miller > > Program Manager > > Exam Development Level 1 > > Linux Professional Institute > > > > _______________________________________________ > > lpi-examdev mailing list > > lpi-examdev@lpi.org > > http://list.lpi.org/mailman/listinfo/lpi-examdev > > _______________________________________________ > lpi-examdev mailing list > lpi-examdev@lpi.org > http://list.lpi.org/mailman/listinfo/lpi-examdev > -- Mark Miller Program Manager Exam Development Level 1 Linux Professional Institute _______________________________________________ lpi-examdev mailing list lpi-examdev@lpi.org http://list.lpi.org/mailman/listinfo/lpi-examdev
