On 12/17/2014 10:16 AM, Michael MacIsaac wrote: >> > You might also consider TMPFS for /tmp. It's much faster if you don't >> > need huge /tmp capacity or persistence. > At one point, we started to recommend this in "The Virtualization > Cookbook". The reply was to avoid it because tmpfs costs you memory which > is much more valuable on z than disk.
Would like to know details backing that recommendation because it sounds like ROT: makes sense in some context but does not necessarily generalize. Or perhaps made sense at one time but is not so accurate now. Got measurements? Sure, memory is valuable on z. It's very valuable in any virtualization context (z or other). But z/VM is peculiarly good about handling memory, when properly tuned. Combine that wonderful z/VM paging (of what Linux sees as real) with VDISK (for Linux swap) and now Linux-on-z/VM has a total memory footprint where TMPFS is again an option. Another option is to use VDISK for /tmp. What I mean is: use VDISK as a normal filesystem (rather than just more swap space). -- Rick Troth Senior Software Developer Velocity Software Inc. Mountain View, CA 94041 Main: (877) 964-8867 Direct: (614) 594-9768 [email protected] <mailto:[email protected]> ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] 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/
