On Wed, Jan 27, 2010 at 10:48:01PM -0500, Ted Unangst wrote: > Obviously, as any competent sysadmin like nixlists knows, you should > restrict all your processes to a max of 20 megs.
64KB is enough for anyone. Giving people more resources they may misuse is just "stupid". And swap is doubly so since if you properly tote up all resources for all tasks and combination of tasks you may ever run and limit them appropriately you will never use swap, thus it is just a waste of disk space. Plus if you run with disk cache enabled you are probably losing the data anyway. In fact this whole 'virtual' memory thing is a crock. You should just know what all of your tasks will use and hard code that into the source. Then they can always run at the same physical address and life is much better. And don't get me started on the sillyness of 'shared' libraries. Not every task mix needs all those routines. So when we are statically figuring out the physical memory locations for every combination of tasks we will ever run we should determine exactly what routines are needed and put them into each program. Preferably tailored to only those situations we know the program will encounter. After all, those error checks are for situations we will have thought about and avoided. In short, this whole OS thing is a giant scam. And compilers ... .... Ken > > On Jan 27, 2010, at 9:23 PM, bofh <goodb...@gmail.com> wrote: > > >On Wed, Jan 27, 2010 at 8:14 PM, nixlists <nixmli...@gmail.com> wrote: > >>On Wed, Jan 27, 2010 at 7:53 PM, Denis Doroshenko > >><denis.doroshe...@gmail.com> wrote: > >>>aren't you missing the point of original comment made by Otto? > >>> > >>>consider a situation, when all the processes in the system "are > >>>behaving", none of them violates their rlimits, but they all > >>>together > >>>have allocated more memory than the box contains (RAM + swap). > >> > >>The idea is to limit memory such that running out of RAM+swap is not > >>possible, or unlikely. You can set the limit on the allowed number of > >>processes as well. > > > > > >$ ulimit -m > >971876 > >$ dmesg | grep real\ mem > >real mem = 1039691776 (991MB) > > > >So... this box should run only one process? > > > >$ ps -auxww|wc > > 54 713 4936 > > > >If I were to use the max memory usage of each process, I would need a > >53Gig ram machine? > > > > > >-- > >http://www.glumbert.com/media/shift > >http://www.youtube.com/watch?v=tGvHNNOLnCk > >"This officer's men seem to follow him merely out of idle curiosity." > >-- Sandhurst officer cadet evaluation. > >"Securing an environment of Windows platforms from abuse - external or > >internal - is akin to trying to install sprinklers in a fireworks > >factory where smoking on the job is permitted." -- Gene Spafford > >learn french: http://www.youtube.com/watch?v=30v_g83VHK4
