From 4b28b6580fb9eff667fe3f6d555f8939c52958bf Mon Sep 17 00:00:00 2001
From: yuanguangxin <274841922@qq.com>
Date: Tue, 23 Jun 2020 11:09:48 +0800
Subject: [PATCH] update

---
 .idea/workspace.xml | 36 +++++++++++++++++++-----------------
 Rocket.md           |  4 ++++
 2 files changed, 23 insertions(+), 17 deletions(-)

diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index fa90d3c..d10f85c 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -20,8 +20,8 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="">
-      <change afterPath="$PROJECT_DIR$/.idea/codeStyles/codeStyleConfig.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Rocket.md" beforeDir="false" afterPath="$PROJECT_DIR$/Rocket.md" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -278,13 +278,8 @@
       <workItem from="1591758584495" duration="3000" />
       <workItem from="1592230200964" duration="1933000" />
       <workItem from="1592291352584" duration="6590000" />
-    </task>
-    <task id="LOCAL-00023" summary="update Rocket.md">
-      <created>1581857522107</created>
-      <option name="number" value="00023" />
-      <option name="presentableId" value="LOCAL-00023" />
-      <option name="project" value="LOCAL" />
-      <updated>1581857522107</updated>
+      <workItem from="1592577669343" duration="2000" />
+      <workItem from="1592881051365" duration="204000" />
     </task>
     <task id="LOCAL-00024" summary="update Rocket.md">
       <created>1581858072286</created>
@@ -622,7 +617,14 @@
       <option name="project" value="LOCAL" />
       <updated>1591717167748</updated>
     </task>
-    <option name="localTasksCounter" value="72" />
+    <task id="LOCAL-00072" summary="update">
+      <created>1592388297996</created>
+      <option name="number" value="00072" />
+      <option name="presentableId" value="LOCAL-00072" />
+      <option name="project" value="LOCAL" />
+      <updated>1592388297996</updated>
+    </task>
+    <option name="localTasksCounter" value="73" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -709,10 +711,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="458" y="204" key="#com.intellij.refactoring.safeDelete.UnsafeUsagesDialog/0.0.1440.900@0.0.1440.900" timestamp="1587221348872" />
-    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1592388288495">
+    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1592388297859">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1592388288495" />
+    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1592388297859" />
     <state x="404" y="60" key="CommitChangelistDialog2/0.0.1920.1080@0.0.1920.1080" timestamp="1591633493160" />
     <state x="143" y="78" width="1152" height="720" key="DiffContextDialog" timestamp="1592386883631">
       <screen x="0" y="0" width="1440" height="900" />
@@ -784,10 +786,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="221" y="63" key="SettingsEditor/0.0.1440.900@0.0.1440.900" timestamp="1585223890241" />
-    <state x="488" y="252" key="Vcs.Push.Dialog.v2" timestamp="1591717170083">
-      <screen x="0" y="0" width="2194" height="1194" />
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1592388299499">
+      <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1588749781144" />
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1592388299499" />
     <state x="427" y="228" key="Vcs.Push.Dialog.v2/0.0.1920.1080@0.0.1920.1080" timestamp="1591633495184" />
     <state x="488" y="252" key="Vcs.Push.Dialog.v2/0.0.2194.1194@0.0.2194.1194" timestamp="1591717170083" />
     <state x="100" y="100" width="1240" height="700" key="com.intellij.history.integration.ui.views.FileHistoryDialog" timestamp="1587219014962">
@@ -807,11 +809,11 @@
     </state>
     <state x="378" y="207" width="683" height="486" key="find.popup/0.0.1440.900@0.0.1440.900" timestamp="1586846937826" />
     <state x="504" y="248" width="911" height="584" key="find.popup/0.0.1920.1080@0.0.1920.1080" timestamp="1591635370753" />
-    <state x="479" y="282" key="git4idea.merge.GitPullDialog" timestamp="1592386920559">
-      <screen x="0" y="0" width="1440" height="900" />
+    <state x="638" y="338" key="git4idea.merge.GitPullDialog" timestamp="1592881772478">
+      <screen x="0" y="0" width="1920" height="1080" />
     </state>
     <state x="479" y="282" key="git4idea.merge.GitPullDialog/0.0.1440.900@0.0.1440.900" timestamp="1592386920559" />
-    <state x="638" y="338" key="git4idea.merge.GitPullDialog/0.0.1920.1080@0.0.1920.1080" timestamp="1591809009592" />
+    <state x="638" y="338" key="git4idea.merge.GitPullDialog/0.0.1920.1080@0.0.1920.1080" timestamp="1592881772478" />
     <state x="385" y="196" width="670" height="676" key="search.everywhere.popup" timestamp="1587219643331">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
diff --git a/Rocket.md b/Rocket.md
index 0440c9d..474124d 100644
--- a/Rocket.md
+++ b/Rocket.md
@@ -719,6 +719,10 @@ Kafka最初考虑的问题是，customer应该从brokes拉取消息还是brokers
 4. 进程间不会相互影响，一个线程挂掉将导致整个进程挂掉。
 5. 系统在运行的时候会为每个进程分配不同的内存空间；而对线程而言，除了CPU外，系统不会为线程分配内存（线程所使用的资源来自其所属进程的资源），线程组之间只能共享资源。
 
+### 多线程和单线程
+
+线程不是越多越好，假如你的业务逻辑全部是计算型的（CPU密集型）,不涉及到IO，并且只有一个核心。那肯定一个线程最好，多一个线程就多一点线程切换的计算，CPU不能完完全全的把计算能力放在业务计算上面，线程越多就会造成CPU利用率（用在业务计算的时间/总的时间）下降。但是在WEB场景下，业务并不是CPU密集型任务，而是IO密集型的任务，一个线程是不合适，如果一个线程在等待数据时，把CPU的计算能力交给其他线程，这样也能充分的利用CPU资源。但是线程数量也要有个限度，一般线程数有一个公式：最佳启动线程数=[任务执行时间/(任务执行时间-IO等待时间)]*CPU内核数超过这个数量，CPU要进行多余的线程切换从而浪费计算能力，低于这个数量，CPU要进行IO等待从而造成计算能力不饱和。总之就是要尽可能的榨取CPU的计算能力。如果你的CPU处于饱和状态，并且没有多余的线程切换浪费，那么此时就是你服务的完美状态，如果再加大并发量，势必会造成性能上的下降。
+
 ### 进程的组成部分
 
 进程由进程控制块（PCB）、程序段、数据段三部分组成。