From 02194323bd455e1d1a83c6d1d930045983fc767c Mon Sep 17 00:00:00 2001
From: Jack Lukic <jacklukic@gmail.com>
Date: Fri, 5 Jun 2026 13:23:56 -0400
Subject: [PATCH] Revert "Bench: Add clean-heap and forced-GC krausest update
 probes (#235)"

This reverts commit ec473bf3facc1ce5e9f0b7957f4f994a360335c4.
---
 .../bench/tachometer/bench-krausest.js        | 55 -------------------
 .../tachometer/tachometer-ci-krausest.json    |  8 +--
 2 files changed, 2 insertions(+), 61 deletions(-)

diff --git a/packages/component/bench/tachometer/bench-krausest.js b/packages/component/bench/tachometer/bench-krausest.js
index b25f35312..042366dc2 100644
--- a/packages/component/bench/tachometer/bench-krausest.js
+++ b/packages/component/bench/tachometer/bench-krausest.js
@@ -206,36 +206,6 @@ function getRows(el) {
   return el.component.getRows();
 }
 
-/*******************************
-      Update (clean heap)
-      Same workload as update-10th-50 but run first, before the
-      create-heavy ops, so the measured region starts on a clean heap.
-      The delta against update-10th-50 isolates suite-ordering GC cost.
-*******************************/
-
-// Warm render / reconcile / update so the first-op cold JIT doesn't
-// skew the isolated measure.
-const elWarm = await mount();
-elWarm.component.run(1000);
-await flush();
-for (let i = 0; i < 10; i++) {
-  elWarm.component.update();
-  flushWork();
-}
-destroy();
-
-const elIso = await mount();
-elIso.component.run(1000);
-await flush();
-// purpose: Same update workload as update-10th-50 but on a clean heap with no create-heavy ops before it. Pairs with update-10th-50 to isolate suite-ordering GC pressure.
-performance.mark(startMark('update-isolated-50'));
-for (let i = 0; i < 50; i++) {
-  elIso.component.update();
-  flushWork();
-}
-performance.measure('update-isolated-50', startMark('update-isolated-50'));
-destroy();
-
 /*******************************
       Create
       (krausest 01_run, 02b_runlots)
@@ -309,31 +279,6 @@ for (let i = 0; i < 50; i++) {
 performance.measure('update-10th-50', startMark('update-10th-50'));
 destroy();
 
-/*******************************
-      Update (forced GC)
-      update-10th workload with a full GC before the measured region.
-      If the update-10th-50 delta vanishes here, the carried-in cost is
-      reclaimable GC pressure from the create-heavy ops above.
-*******************************/
-
-const el5b = await mount();
-el5b.component.run(1000);
-await flush();
-// gc() exists only under --js-flags=--expose-gc (set in tachometer-ci-krausest.json).
-// Settle after collecting so the measured region starts on a post-GC heap.
-if (globalThis.gc) {
-  globalThis.gc();
-  await flush();
-}
-// purpose: update-10th workload with a forced GC before the measured region. If the update-10th-50 regression vanishes here it is reclaimable GC pressure.
-performance.mark(startMark('update-gc-50'));
-for (let i = 0; i < 50; i++) {
-  el5b.component.update();
-  flushWork();
-}
-performance.measure('update-gc-50', startMark('update-gc-50'));
-destroy();
-
 /*******************************
       Select
       (krausest 05_select)
diff --git a/packages/component/bench/tachometer/tachometer-ci-krausest.json b/packages/component/bench/tachometer/tachometer-ci-krausest.json
index 98cef950d..1831aa38e 100644
--- a/packages/component/bench/tachometer/tachometer-ci-krausest.json
+++ b/packages/component/bench/tachometer/tachometer-ci-krausest.json
@@ -8,15 +8,13 @@
     {
       "name": "this-change",
       "url": "ci-current-krausest.html",
-      "browser": { "name": "chrome", "headless": true, "addArguments": ["--js-flags=--expose-gc"] },
+      "browser": { "name": "chrome", "headless": true },
       "measurement": [
         { "mode": "performance", "entryName": "create-1k" },
         { "mode": "performance", "entryName": "create-10k" },
         { "mode": "performance", "entryName": "replace-1k" },
         { "mode": "performance", "entryName": "append-1k" },
         { "mode": "performance", "entryName": "update-10th-50" },
-        { "mode": "performance", "entryName": "update-isolated-50" },
-        { "mode": "performance", "entryName": "update-gc-50" },
         { "mode": "performance", "entryName": "select-40" },
         { "mode": "performance", "entryName": "swap-rows-20" },
         { "mode": "performance", "entryName": "remove-row-front-20" },
@@ -28,15 +26,13 @@
     {
       "name": "tip-of-tree",
       "url": "ci-baseline-krausest.html",
-      "browser": { "name": "chrome", "headless": true, "addArguments": ["--js-flags=--expose-gc"] },
+      "browser": { "name": "chrome", "headless": true },
       "measurement": [
         { "mode": "performance", "entryName": "create-1k" },
         { "mode": "performance", "entryName": "create-10k" },
         { "mode": "performance", "entryName": "replace-1k" },
         { "mode": "performance", "entryName": "append-1k" },
         { "mode": "performance", "entryName": "update-10th-50" },
-        { "mode": "performance", "entryName": "update-isolated-50" },
-        { "mode": "performance", "entryName": "update-gc-50" },
         { "mode": "performance", "entryName": "select-40" },
         { "mode": "performance", "entryName": "swap-rows-20" },
         { "mode": "performance", "entryName": "remove-row-front-20" },