Logging performance and memory benchmarks to git notes during precommit testing.

tools/perf.sh

@@ -18,4 +18,4 @@ ITERS=$1
 ENGINE=$2
 BENCHMARK=$3
 
-( ( for i in `seq 0 1 $ITERS`; do time "$ENGINE" "$BENCHMARK"; done ) 2>&1 ) | grep user | sed 's/[ms]/ /g' | awk '{ s += $2 * 60 + $3; n += 1; } END { print s / n; }'
+( ( for i in `seq 1 1 $ITERS`; do time "$ENGINE" "$BENCHMARK"; done ) 2>&1 ) | grep user | sed 's/user[ \t]*\([0-9]*\)m\([0-9.]*\)s/\1 \2/g' | awk '{ s += $1 * 60 + $2; n += 1; } END { print s / n; }'