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#! /bin/sh
set -e
create_src() {
n=$1
i=0
while [ $i -lt $n ]; do
file=$i.cc
cat <<EOF >$file
#include <algorithm>
#include <deque>
#include <iostream>
#include <list>
#include <map>
#include <set>
#include <sstream>
#include <string>
#include <vector>
int var$i;
EOF
i=$(($i + 1))
done
}
compile() {
n=$1
compiler=$2
i=0
objdir=objs
rm -rf $objdir
mkdir -p $objdir
while [ $i -lt $n ]; do
echo " $compiler -c -O2 $i.cc -o $objdir/$i.o"
$compiler -c $i.cc -O2 -o $objdir/$i.o
i=$(($i + 1))
done
}
now() {
perl -e 'use Time::HiRes qw(time); print time'
}
elapsed() {
perl -e 'use Time::HiRes qw(time); printf("%.3f\n", time - $ARGV[0])' $1
}
###############################################################################
if [ -n "$CXX" ]; then
cxx="$CXX"
else
cxx=c++
fi
ccache=../ccache
tmpdir=tmpdir.$$
CCACHE_DIR=.ccache
export CCACHE_DIR
CCACHE_NODIRECT=1
export CCACHE_NODIRECT
rm -rf $tmpdir
mkdir $tmpdir
cd $tmpdir
n=30
create_src $n
echo "Without ccache:"
t0=$(now)
compile $n $cxx
echo "Time: $(elapsed $t0)"
echo "With ccache, no direct, cache miss:"
t0=$(now)
compile $n "$ccache $cxx"
echo "Time: $(elapsed $t0)"
echo "With ccache, no direct, cache hit:"
t0=$(now)
compile $n "$ccache $cxx"
echo "Time: $(elapsed $t0)"
unset CCACHE_NODIRECT
CCACHE_LOGFILE=ccache.log
export CCACHE_LOGFILE
rm -rf $CCACHE_DIR
echo "With ccache, direct, cache miss:"
t0=$(now)
compile $n "$ccache $cxx"
echo "Time: $(elapsed $t0)"
echo "With ccache, direct, cache hit:"
t0=$(now)
compile $n "$ccache $cxx"
echo "Time: $(elapsed $t0)"
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