I'm back with more info.
A quick recap.  I'm getting:
ld_mmap: could not malloc 51118343ld. bytes for /ora-home/app/oracle/product/8.05/lib//libnetwork.a(nauza.o) 
file                                 file_offset / flen -- pg bndry file offst -> last file offst mmapd
mmap usage info not available; max of 160. slots
ld_mmap: could not malloc 51118343ld. bytes for /ora-home/app/oracle/product/8.05/lib//libnetwork.a(nauza.o) 
Fatal error in: /usr/lib/cmplrs/cc/ld IOT/Abort trap - core dumped
trying to install Oracle on a 512 Mb RAM AlphaServer 800, running
nothing else (all 1 Gb of swap is free.)
Several people (thank you!) have mentioned changing some kernel
parameters.  I should have included mine in my original post, so here
goes:
ipc:
  msg-mni = 1024
  msg-tql = 4096
  shm-max = 2118123520
proc:
  max-proc-per-user = 1024
  max-threads-per-user = 1024
  max-per-proc-data-size = 534724608
  max-per-proc-address-space = 534724608
  per-proc-address-space = 534724608
  per-proc-data-size = 534724608
rt:
  aio-max-percent = 2
vm:
  ubc-minpercent = 1
  ubc-maxpercent = 2
  vm-mapentries = 400
I've verified (by running 'limit') at the shell prompt that the memory
is available.
Neither Oracle nor Compaq have found a solution.
Please help!
-- 
Dave Brady                 FAS Computer Services
Sr UNIX Sys Admin/DBA      Harvard University
brady_at_fas.harvard.edu      LL1A Science Center
Phone: (617) 495-1273      1 Oxford Street
FAX:   (617) 495-1210      Cambridge, MA 02138
Received on Wed May 12 1999 - 16:45:23 NZST