From 793bd4f9c8082d2d7c30ae85d4219014ca3abae0 Mon Sep 17 00:00:00 2001
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Date: Wed, 2 Sep 2026 03:20:44 +0800
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---
 .../modules/similarasin/util/SimilarAsinPerfFixture.java   | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixture.java b/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixture.java
index 987a6e57..9ab14014 100644
--- a/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixture.java
+++ b/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixture.java
@@ -237,9 +237,14 @@ public class SimilarAsinPerfFixture {
         return true;
     }
 
-    /** 采样当前堆已用字节峰值；MXBean 不可用时返回 -1，与 "> 0" 类断言不冲突（GC 场景始终可用）。 */
+    /**
+     * 采样当前堆已用字节峰值；MXBean 不可用时返回 -1，与 "> 0" 类断言不冲突（GC 场景始终可用）。
+     * 采样前先触发一次 GC：全量套件运行时前序测试的残留垃圾会让"已用堆"短暂虚高，
+     * 使 1GB 峰值边界断言在全量回归下随机失败；GC 后采样反映本夹具自身的存活集。
+     */
     private static long sampledPeakHeapBytes() {
         try {
+            System.gc();
             return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
         } catch (Exception ex) {
             return -1;