On Thursday, July 07, 2011 03:57:04 PM Brunner, Brian T. wrote: > centos-bounces@xxxxxxxxxx wrote: > > On 07/06/11 5:40 PM, John J. Boyer wrote: > >> When I first installed my CentOS system the machine had only 1 GB. > >> the swap memory was set to 2 GB Now the machine has 4 GB but swap is > >> still 2 GB. With that much memory maybe it doesn't matter, but it > >> sure looks odd. Is there any way to change it? > > > > add another swap extent via the swapon(8) command. > > > > but, 2gb is plenty of swap for a 4gb system, anyone who > > insists on swap > > > > >= physical memory is smoking something left over from the 1970s. > > This is true both literally and figuratively. Actually there are cases where you do want swap ~= physical (even though you wont be "using it". For example, if you need to increase the ulimit for stack size (some apps need this) then for a normal fork the kernel will need (free phys + free swap) > this. So in the end you'll need a bit more swap then your required stack size limit. Worth noting is that if you set it to unlimited then you don't need to reserve any swap for it... /Peter
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