[nexus] Refactor test-utilities to helper crate, add test benchmarks

Cargo.toml

@@ -3,6 +3,7 @@ members = [
     "common",
     "nexus",
     "nexus/src/db/db-macros",
+    "nexus/test-utils",
     "nexus-client",
     "package",
     "rpaths",
@@ -22,6 +23,7 @@ default-members = [
     "common",
     "nexus",
     "nexus/src/db/db-macros",
+    "nexus/test-utils",
     "package",
     "rpaths",
     "sled-agent",

nexus/Cargo.toml

@@ -107,8 +107,9 @@ version = "0.8"
 features = [ "serde", "v4" ]
 
 [dev-dependencies]
-bytes = "1.0.1"
+criterion = { version = "0.3", features = [ "async_tokio" ] }
 expectorate = "1.0.4"
+nexus-test-utils = { path = "test-utils" }
 omicron-test-utils = { path = "../test-utils" }
 openapiv3 = "0.5.0"
 oximeter-db = { path = "../oximeter/db" }
@@ -118,9 +119,9 @@ subprocess = "0.2.8"
 git = "https://github.com/oxidecomputer/openapi-lint"
 branch = "main"
 
-[dev-dependencies.oximeter-collector]
-version = "0.1.0"
-path = "../oximeter/collector"
+[[bench]]
+name = "setup_benchmark"
+harness = false
 
 #
 # Disable doc builds by default for our binaries to work around issue

nexus/benches/setup_benchmark.rs

@@ -0,0 +1,59 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+//! Benchmarks test setup/teardown.
+
+use criterion::{criterion_group, criterion_main, Criterion};
+use dropshot::test_util::LogContext;
+use omicron_test_utils::dev;
+
+// This is the default wrapper around most Nexus integration tests.
+// Benchmark how long an "empty test" would take.
+async fn do_full_setup() {
+    let ctx = nexus_test_utils::test_setup("full_setup").await;
+    ctx.teardown().await;
+}
+
+// Wraps exclusively the CockroachDB portion of setup/teardown.
+async fn do_crdb_setup() {
+    let cfg = nexus_test_utils::load_test_config();
+    let logctx = LogContext::new("crdb_setup", &cfg.log);
+    let mut db = dev::test_setup_database(&logctx.log).await;
+    db.cleanup().await.unwrap();
+}
+
+// Wraps exclusively the ClickhouseDB portion of setup/teardown.
+async fn do_clickhouse_setup() {
+    let mut clickhouse =
+        dev::clickhouse::ClickHouseInstance::new(0).await.unwrap();
+    clickhouse.cleanup().await.unwrap();
+}
+
+fn setup_benchmark(c: &mut Criterion) {
+    let mut group = c.benchmark_group("Test Setup");
+    group.bench_function("do_full_setup", |b| {
+        b.to_async(tokio::runtime::Runtime::new().unwrap())
+            .iter(|| do_full_setup());
+    });
+    group.bench_function("do_crdb_setup", |b| {
+        b.to_async(tokio::runtime::Runtime::new().unwrap())
+            .iter(|| do_crdb_setup());
+    });
+    group.bench_function("do_clickhouse_setup", |b| {
+        b.to_async(tokio::runtime::Runtime::new().unwrap())
+            .iter(|| do_clickhouse_setup());
+    });
+    group.finish();
+}
+
+criterion_group!(
+    name = benches;
+    // To accomodate the fact that these benchmarks are a bit bulky,
+    // we set the following:
+    // - Smaller sample size, to keep running time down
+    // - Higher noise threshold, to avoid avoid false positive change detection
+    config = Criterion::default().sample_size(10).noise_threshold(0.10);
+    targets = setup_benchmark
+);
+criterion_main!(benches);