diff --git a/applist b/applist
index 9e21a28..19465b6 100755
--- a/applist
+++ b/applist
@@ -5,7 +5,6 @@ com.taobao.taobao
 com.xunmeng.pinduoduo
 com.ss.android.article.news
 com.sina.weibo
-com.android.contacts
 com.tencent.mobileqq
 com.tencent.qqlive
 com.smile.gifmaker
diff --git a/run.sh b/run.sh
index 17976cf..5da228d 100755
--- a/run.sh
+++ b/run.sh
@@ -1,5 +1,19 @@
 #$dirput: round app start_time start_type rss pss ratio pagefault itlbmiss dtlbmiss cpustalled
 
+nr_dev=$(adb devices | grep -v "List of devices" | grep device -c)
+
+if [ $nr_dev -gt 1 ] && [ -z "$ANDROID_SERIAL" ] ; then
+	echo "adb: more than one device/emulator"
+	exit
+fi
+
+if [ -z "$ANDROID_SERIAL" ]; then
+	sid=$(adb devices | grep -v "List of devices" | grep device | awk '{print $1}')
+	export ANDROID_SERIAL=$sid
+fi
+
+echo $ANDROID_SERIAL
+
 adb root
 adb push perfconf.txt /data/misc/perfetto-configs
 
@@ -7,12 +21,14 @@ if [ $? -ne 0 ]; then
 	exit
 fi
 
-dir=$(/usr/bin/date +%Y-%m%d-%H%M)
-mkdir $dir
+dir=$ANDROID_SERIAL/$(/usr/bin/date +%Y-%m%d-%H%M)
+
+mkdir -p $dir
 mkdir $dir/system_mem
 mkdir $dir/traces
 mkdir $dir/meminfo
 mkdir $dir/simpleperf
+
 echo "round app start_type start_time inc_ratio inc_total rss pss pagefaults itlbmiss dtlbmiss cpustall" > $dir/result
 
 for round in $(seq 1 1); do