ken@turtlevax.UUCP (Ken Turkowski) (01/05/85)
In the compress 3.0 source recently posted to mod.sources, there is a
#define variable which can be set for optimum performance on a machine
with a large amount of memory. A program (usermem) to calculate the
useable amount of physical user memory is enclosed, as well as a sample
4.2bsd Vax Makefile for compress.
-----------------------------------------------------------------
# This is a shell archive. Remove anything before this line, then
# unpack it by saving it in a file and typing "sh file". (Files
# unpacked will be owned by you and have default permissions.)
#
# This archive contains:
# Makefile usermem
echo x - Makefile
cat > "Makefile" << '//E*O*F Makefile//'
# if you have bugs in your C compiler dont use -O
COMFLAGS=-DBSD4_2 -O -DSACREDMEM=256000
BIN=/usr/bin
compress : compress.c USERMEM
cc $(COMFLAGS) -DUSERMEM=`cat USERMEM` -o compress compress.c
# USERMEM may have to be set by hand. It should contain the amount of
# available user memory in bytes. Set it to zero, for physical memory
# less than 1 Meg.
USERMEM:
sh usermem > USERMEM
install: compress
cp compress $BIN
rm -f $BIN/uncompress $BIN/zcat
ln $BIN/compress $BIN/uncompress
ln $BIN/compress $BIN/zcat
//E*O*F Makefile//
echo x - usermem
cat > "usermem" << '//E*O*F usermem//'
: This shell script snoops around to find the maximum amount of available
: user memory. These variables need to be set only if there is no
: /usr/adm/messages. KMEM, UNIX, and CLICKSIZE can be set on the command
: line, if desired, e.g. UNIX=/unix
KMEM=/dev/kmem # User needs read access to KMEM
UNIX=
# VAX CLICKSIZE=512, UNIX=/vmunix
# PDP-11 CLICKSIZE=64, UNIX=/unix
# CADLINC 68000 CLICKSIZE=4096, UNIX=/unix
# Perkin-Elmer 3205 CLICKSIZE=4096, UNIX=/edition7
# Perkin-Elmer all others, CLICKSIZE=2048, UNIX=/edition7
CLICKSIZE=512
eval $*
SIZE=0
if test -r /usr/adm/messages # probably the most transportable
then
SIZE=`grep avail /usr/adm/messages | sed -n '$s/.*[ ]//p'`
fi
if test 0$SIZE -le 0 # no SIZE in /usr/adm/messages
then
if test -r $KMEM # Readable KMEM
then
if test -n "$UNIX"
then
: User must have specified it already.
elif test -r /vmunix
then
UNIX=/vmunix
CLICKSIZE=512 # Probably VAX
elif test -r /edition7
then
UNIX=/edition7
CLICKSIZE=2048 # Perkin-Elmer: change to 4096 on a 3205
elif test -r /unix
then
UNIX=/unix # Could be anything
fi
if test -n "$UNIX"
then
SIZE=`echo maxmem/D | adb $UNIX $KMEM | sed -n '$s/.*[ ]//p'`
if test 0$SIZE -le 0
then
SIZE=`echo physmem/D | adb $UNIX $KMEM | sed -n '$s/.*[ ]//p'`
fi
SIZE=`expr 0$SIZE '*' $CLICKSIZE`
fi
fi
fi
if test 0$SIZE -le 0
then
echo 0
else
echo $SIZE
fi
//E*O*F usermem//
echo Possible errors detected by \'sum\' [hopefully none]:
temp=/tmp/shar$$
trap "rm -f $temp; exit" 0 1 2 3 15
cat > $temp <<\!!!
14495 1 Makefile
42168 2 usermem
!!!
sum Makefile usermem | sed 's=[^ ]*/==' | diff -b $temp -
exit 0
--
Ken Turkowski @ CADLINC, Menlo Park, CA
UUCP: {amd,decwrl,nsc,spar}!turtlevax!ken
ARPA: turtlevax!ken@DECWRL.ARPA
--
Ken Turkowski @ CADLINC, Menlo Park, CA
UUCP: {amd,decwrl,nsc,spar}!turtlevax!ken
ARPA: turtlevax!ken@DECWRL.ARPA