diplodocus.org Git - nmh/blob - docs/historical/mh-6.8.5/miscellany/compress-4.0/usermem

   1 : This shell script snoops around to find the maximum amount of available
   2 : user memory.  These variables need to be set only if there is no
   3 : /usr/adm/messages.  KMEM, UNIX, and CLICKSIZE can be set on the command
   4 : line, if desired, e.g. UNIX=/unix
   5 KMEM=/dev/kmem          # User needs read access to KMEM
   6 UNIX=
   7 # VAX                   CLICKSIZE=512,  UNIX=/vmunix
   8 # PDP-11                CLICKSIZE=64,   UNIX=/unix
   9 # CADLINC 68000         CLICKSIZE=4096, UNIX=/unix
  10 # Perkin-Elmer 3205     CLICKSIZE=4096, UNIX=/edition7
  11 # Perkin-Elmer all others, CLICKSIZE=2048, UNIX=/edition7
  12 CLICKSIZE=512
  13 eval $*
  14
  15 SIZE=0
  16 if test -r /usr/adm/messages    # probably the most transportable
  17 then
  18     SIZE=`grep avail /usr/adm/messages | sed -n '$s/.*[         ]//p'`
  19 fi
  20
  21 if test 0$SIZE -le 0            # no SIZE in /usr/adm/messages
  22 then
  23     if test -r $KMEM            # Readable KMEM
  24     then
  25         if test -n "$UNIX"
  26         then
  27             : User must have specified it already.
  28         elif test -r /vmunix
  29         then
  30             UNIX=/vmunix
  31             CLICKSIZE=512       # Probably VAX
  32         elif test -r /edition7
  33         then
  34             UNIX=/edition7
  35             CLICKSIZE=2048      # Perkin-Elmer: change to 4096 on a 3205
  36         elif test -r /unix
  37         then
  38             UNIX=/unix          # Could be anything
  39         fi
  40         if test -n "$UNIX"
  41         then
  42             SIZE=`echo maxmem/D | adb $UNIX $KMEM | sed -n '$s/.*[      ]//p'`
  43             if test 0$SIZE -le 0
  44             then
  45                 SIZE=`echo physmem/D | adb $UNIX $KMEM | sed -n '$s/.*[         ]//p'`
  46             fi
  47             SIZE=`expr 0$SIZE '*' $CLICKSIZE`
  48         fi
  49     fi
  50 fi
  51
  52 case $UNIX in
  53     /vmunix)            # Assume 4.2bsd: check for resource limits
  54         MAXSIZE=`csh -c limit | awk 'BEGIN      { MAXSIZE = 1000000 }
  55 /datasize|memoryuse/ && NF == 3 { if ($2 < MAXSIZE) MAXSIZE = $2 }
  56 END     { print MAXSIZE * 1000 }'`
  57         if test $MAXSIZE -lt $SIZE
  58         then
  59             SIZE=$MAXSIZE
  60         fi
  61         ;;
  62 esac
  63
  64 if test 0$SIZE -le 0
  65 then
  66     echo 0;exit 1
  67 else
  68     echo $SIZE
  69 fi