Add benchmark script.

example/benchmark.sh

+#!/bin/sh
+
+# Runtime is typically dominated by the costs of GetAttr (ie. Stat),
+# so let's time that.  We use zipfs which runs from memory to minimize
+# noise due to the filesystem itself.
+
+set -eux
+
+ZIPFILE=$1
+shift
+
+gomake -C zipfs
+gomake -C bulkstat
+
+MP=/tmp/zipbench
+mkdir -p ${MP}
+
+ZIPFS=$PWD/zipfs/zipfs
+BULKSTAT=$PWD/bulkstat/bulkstat
+
+cd /tmp
+
+${ZIPFS} ${MP} ${ZIPFILE} >& zipfs.log &
+find ${MP} > /tmp/zipfiles.txt
+fusermount -u /tmp/zipbench
+
+# The command below should be profiled.
+${ZIPFS} ${MP} ${ZIPFILE} >& zipfs.log &
+
+# Wait for zipfs to unpack and serve the file.
+sleep 1
+
+# Warm caches.
+${BULKSTAT} /tmp/zipfiles.txt
+
+# C++ binaries can do this ~0.1ms/stat.
+${BULKSTAT} /tmp/zipfiles.txt
+
+
+fusermount -u /tmp/zipbench
+
+
+cat zipfs.log