Add index performance script

scripts/performance/README.md

@@ -0,0 +1,4 @@
+Performance Scripts
+===================
+
+This directory is a collection of scripts for exercising rekor's performance.

scripts/performance/index-storage/README.md

@@ -0,0 +1,40 @@
+Rekor Performance Tester
+========================
+
+Scripts to repeatably gather performance metrics for index storage insertion and
+retrieval in rekor.
+
+Usage
+-----
+
+Use terraform to set up the services in GCP:
+
+```
+cd terraform
+terraform init
+terraform plan
+terraform apply
+```
+
+Copy or clone this repository on to the bastion VM that terraform instantiates.
+Run this script from there:
+
+```
+export INSERT_RUNS=<N> # The number of inserts to perform and measure. This doesn't need to be terribly high.
+export SEARCH_ENTRIES=<M> # The number of entries to upload to the database out of band to search against. This should be sufficiently high to represent a real database.
+export INDEX_BACKEND=<redis|mysql> # The index backend to test against
+export REGION=<region> # The GCP region where the rekor services are deployed
+./index-performance.sh
+```
+
+On the first run, `indices.csv` will be populated with fake search entries,
+which will take a while depending on how big $SEARCH_ENTRIES is. This only
+happens once as long as indices.csv is not removed.
+
+Run `index-performance.sh` against each backend. Then plot the results:
+
+```
+./plot.sh
+```
+
+Copy the resulting `graph.png` back to your local host.