(Butting in for David just to be annoying!) I bet he means FUSE is taxing the shared environment by requiring such a large chunk of memory to be mapped. Even if "sparse", tables for managing it will be needed.
-- R; <>< Rick Troth Velocity Software http://www.velocitysoftware.com/ On Fri, Dec 2, 2011 at 15:17, Jan Glauber <j...@linux.vnet.ibm.com> wrote: > On Fri, 2011-12-02 at 14:05 -0600, David Boyes wrote: >> > It's just mmap'ing the whole disk into the process's address space for the >> > programmers sake. >> >> BAD idea (in the sense of 'broken as designed'). You're taxing the virtual >> memory system in a shared-resource environment, which hurts the entire >> environment for a little convenience in programming. > > David, can you explain me how I'm "taxing" the VM? The mmap operation > does not allocate a single physical page. If I remember right it does > not even set up the page tables for the mapping. > > Jan > >> > If that turns out to be a problem we could theoretically go back to >> > pread/pwrite. But I'm not sure how many users have such large CMS disks? >> >> Please do. Doesn't matter if it's an edge case, it shouldn't do this. >> >> ---------------------------------------------------------------------- >> For LINUX-390 subscribe / signoff / archive access instructions, >> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or >> visit >> http://www.marist.edu/htbin/wlvindex?LINUX-390 >> ---------------------------------------------------------------------- >> For more information on Linux on System z, visit >> http://wiki.linuxvm.org/ >> > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
