From 080eabc300ba2542c85e854160dc2ac17ab9cb8c Mon Sep 17 00:00:00 2001
From: gongdewei <kylixs@qq.com>
Date: Thu, 28 May 2020 11:33:28 +0800
Subject: [PATCH] set split output list initial size

---
 .../src/main/java/com/taobao/arthas/core/advisor/SpyImpl.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/src/main/java/com/taobao/arthas/core/advisor/SpyImpl.java b/core/src/main/java/com/taobao/arthas/core/advisor/SpyImpl.java
index aa540bef6..0a65ff0d8 100644
--- a/core/src/main/java/com/taobao/arthas/core/advisor/SpyImpl.java
+++ b/core/src/main/java/com/taobao/arthas/core/advisor/SpyImpl.java
@@ -203,7 +203,7 @@ public class SpyImpl extends AbstractSpy {
 
     /**
      * 经过优化的字符串split方法，减少产生的内存碎片。
-     * trace/watch 等字节码拦截回调每次都需要进行字符串split，是一个性能瓶颈hotspot。
+     * trace/watch 等字节码拦截回调每次都需要进行字符串split，调用很频繁，产生较多小对象。
      * 注意： 返回的List为重用的缓存对象，不能直接引用它，有需要请复制一份
      * @param str
      * @return
@@ -211,7 +211,7 @@ public class SpyImpl extends AbstractSpy {
     private List<String> splitString(String str) {
         List<String> strs = splitCache.get(str);
         if (strs == null) {
-            strs = new ArrayList<String>();
+            strs = new ArrayList<String>(8);
             StringUtils.splitToList(str, '|', strs);
             splitCache.put(str, strs);
         }