Add script for shutting down tests. (#4203)

ci/long_running_tests/README.rst

@@ -24,6 +24,12 @@ relevant machine, attach to the tmux session (usually ``tmux a -t 0``), inspect
 the logs under ``/tmp/ray/session*/logs/``, and also inspect
 ``/tmp/ray/session*/debug_state.txt``.
 
+Shut Down the Workloads
+-----------------------
+
+The instances running the workloads can all be killed by running
+``./shut_down_workloads.sh``.
+
 Adding a Workload
 -----------------
 

ci/long_running_tests/shut_down_workloads.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -e
+
+ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE:-$0}")"; pwd)
+
+pushd "$ROOT_DIR"
+
+# Kill all of the workloads.
+for workload_file in "$ROOT_DIR"/workloads/*; do
+  file_name=$(basename -- $workload_file)
+  workload_name="${file_name%.*}"
+  ray down -y config.yaml --cluster-name="$workload_name" &
+done
+
+# Wait for all of the ray down commands to finish.
+for pid in `jobs -p`; do
+  wait $pid
+done
+
+popd