Article 145071 of comp.os.vms: In article , Ferguson@mag.aramark.com (Linwood Ferguson) writes: |>I stumbled across the fix for this in the source listings long ago. In the |>linker options file put: |> |> UNSUPPORTED=1 |> |>This causes sharable images to use demand zero pages. For some reason |>executable images do this automatically, but sharable images will not. The reason is that it was discovered VERY late in the field test of VMS V4.0 (I think) that if you installed a shareable image with demand-zero sections /WRITE, then all heck would break loose. Disabling demand-zero compression caused LIBRTL, a VERY frequently activated image, to incur more overhead during image activation. The quick fix was to disable compression unless this UNSUPPORTED=1 was present (it was added for LIBRTL). While it is certainly feasible to go back and fix the problem "right", doing so has never percolated high enough on the task list. So this remains as a great source for delight as each new person discovers it. (It tends to come up frequently at DECUS "VMS Magic" sessions.) -- Steve Lionel mailto:lionel@quark.zko.dec.com Fortran Development http://www.digital.com/info/slionel.html Digital Equipment Corporation 110 Spit Brook Road, ZKO2-3/N30 Nashua, NH 03062-2698 "Free advice is worth every cent" For information on Digital Fortran 90, see http://www.digital.com/info/hpc/f90/