Tree: speed up correctness mode for perf tests (#11334)

Co-authored-by: Craig Macomber <[email protected]>

packages/dds/tree/src/test/domains/json/json.ts

@@ -9,7 +9,7 @@ type Source = () => number;
  * Generates a Jsonable tree with statistical similarities to 'canada.json':
  * https://github.com/serde-rs/json-benchmark/tree/master/data
  */
-export function generateCanada(rnd: Source) {
+export function generateCanada(rnd: Source, tinyVersion = false) {
     // Map uniform distribution in the range [0..1) to a uniform distribution
     // in the range [min, max).
     const uniform = (source: Source, min: number, max: number) =>
@@ -44,7 +44,7 @@ export function generateCanada(rnd: Source) {
     let last_y = 43;
 
     // The geometry of 'canada.json' is encoded as 480 segments of varying length.
-    const segmentLengths = [
+    const segmentLengths = tinyVersion ? [2, 10] : [
         14, 33, 18, 23, 10, 28, 9, 28, 279, 221, 11, 86, 28, 19, 26, 23, 24, 38, 24, 9, 30, 20, 27, 21, 19, 25, 24, 20,
         19, 18, 34, 19, 28, 12, 38, 30, 91, 17, 23, 28, 22, 24, 19, 44, 21, 19, 21, 24, 21, 24, 15, 20, 28, 18, 474,
         17, 19, 12, 12, 1436, 31, 27, 26, 40, 21, 20, 27, 21, 19, 18, 24, 20, 65, 27, 36, 21, 27, 28, 24, 17, 20, 17,

packages/dds/tree/src/test/domains/json/jsonCursor.bench.ts

@@ -4,7 +4,7 @@
  */
 
 import { strict as assert } from "assert";
-import { benchmark, BenchmarkType } from "@fluid-tools/benchmark";
+import { benchmark, BenchmarkType, isInPerformanceTestingMode } from "@fluid-tools/benchmark";
 import { Jsonable } from "@fluidframework/datastore-definitions";
 import { default as Random } from "random-js";
 import { buildForest, ITreeCursor, jsonableTreeFromCursor, TextCursor } from "../../..";
@@ -107,7 +107,8 @@ function bench(name: string, getJson: () => any) {
     }
 }
 
-const canada = generateCanada(makeRng("canada"));
+// Make a test dataset, but only make it large in performance testing mode.
+const canada = generateCanada(makeRng("canada"), !isInPerformanceTestingMode);
 
 describe("ITreeCursor", () => {
     bench("canada", () => canada);