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< span id = "arthas3-0" > < / span > < h1 > Arthas3.0的新特性< a class = "headerlink" href = "#arthas3-0" title = "永久链接至标题" > ¶< / a > < / h1 >
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< span id = "id1" > < / span > < h2 > 在线诊断功能< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > Arthas3.0中最重要的特性，不需要登陆机器就可以对应用进行诊断，体验和本地诊断完全一致< / p >
< div class = "section" id = "" >
< span id = "id2" > < / span > < h3 > 使用步骤< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > TODO< / p >
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< span id = "id3" > < / span > < h3 > 动图演示< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > TODO< / p >
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< span id = "id4" > < / span > < h2 > 管道支持< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > Arthas 3.0开始支持管道, 率先提供了< code class = "docutils literal notranslate" > < span class = "pre" > grep< / span > < / code > ,< code class = "docutils literal notranslate" > < span class = "pre" > wc< / span > < / code > ,< code class = "docutils literal notranslate" > < span class = "pre" > plaintext< / span > < / code > 的支持。< / p >
< / div >
< / div >
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< span id = "groovy" > < / span > < h1 > 去groovy依赖< a class = "headerlink" href = "#groovy" title = "永久链接至标题" > ¶< / a > < / h1 >
< p > groovy表达式在arthas2.0中大量使用， < / p >
< div class = "highlight-sh notranslate" > < div class = "highlight" > < pre > < span > < / span > watch com.alibaba.sample.petstore.web.store.module.screen.ItemList add < span class = "s2" > " params + ' ' + returnObj" < / span > params.size< span class = "o" > ()==< / span > < span class = "m" > 2< / span >
< / pre > < / div >
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< p > 其中< code class = "docutils literal notranslate" > < span class = "pre" > " params< / span > < span class = "pre" > +< / span > < span class = "pre" > '< / span > < span class = "pre" > '< / span > < span class = "pre" > +< / span > < span class = "pre" > returnObj" < / span > < / code > 以及< code class = "docutils literal notranslate" > < span class = "pre" > params.size()==2< / span > < / code > 背后其实都使用了groovy来进行表达式求值， ， ， < / p >
< p > 为了避免这个问题， ， ， < / p >
< p > 在3.0中， ， < a class = "reference external" href = "https://alibaba.github.io/arthas/watch" > 这里< / a > < / p >
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< span id = "rt" > < / span > < h2 > 提升rt统计精度< a class = "headerlink" href = "#rt" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > Arthas 2.0中， < code class = "docutils literal notranslate" > < span class = "pre" > ms< / span > < / code > 为单位， ， ， （ ， ） < code class = "docutils literal notranslate" > < span class = "pre" > ns< / span > < / code > 来统计， ， ！ < / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > $ tt -l
INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD
------------------------------------------------------------------------------------------------------------------------------------------------------------
1000 2017-02-24 10:56:46 808.743525 true false 0x3bd5e918 TestTraceServlet doGet
1001 2017-02-24 10:56:55 805.799155 true false 0x3bd5e918 TestTraceServlet doGet
1002 2017-02-24 10:57:04 808.026935 true false 0x3bd5e918 TestTraceServlet doGet
1003 2017-02-24 10:57:22 805.036963 true false 0x3bd5e918 TestTraceServlet doGet
1004 2017-02-24 10:57:24 803.581886 true false 0x3bd5e918 TestTraceServlet doGet
1005 2017-02-24 10:57:39 814.657657 true false 0x3bd5e918 TestTraceServlet doGet
< / pre > < / div >
< / div >
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< span id = "watch-stack-trace" > < / span > < h2 > watch/stack/trace命令支持按耗时过滤< a class = "headerlink" href = "#watch-stack-trace" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > 我们在trace的时候， ， ， ， ， < code class = "docutils literal notranslate" > < span class = "pre" > #cost< / span > < / code > (方法执行耗时,单位为< code class = "docutils literal notranslate" > < span class = "pre" > ms< / span > < / code > )进行过滤， ， ， ， < / p >
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< span id = "syspropsystemproperty" > < / span > < h2 > sysprop命令操作SystemProperty< a class = "headerlink" href = "#syspropsystemproperty" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > sysprop命令支持查看所有的系统属性， < / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > $ sysprop
...
os.arch x86_64
java.ext.dirs /Users/wangtao/Library/Java/Extensions:/Library/Java/JavaVirtualMachines/jdk1.
8.0_51.jdk/Contents/Home/jre/lib/ext:/Library/Java/Extensions:/Network/Library
/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
user.dir /Users/wangtao/work/ali-tomcat-home/ant-develop/output/build
catalina.vendor alibaba
line.separator
java.vm.name Java HotSpot(TM) 64-Bit Server VM
file.encoding UTF-8
org.apache.tomcat.util.http.ServerCookie.ALLOW_EQUA true
LS_IN_VALUE
com.taobao.tomcat.info Apache Tomcat/7.0.70.1548
java.specification.version 1.8
$ sysprop java.version
java.version=1.8.0_51
$ sysprop production.mode true
Successfully changed the system property.
production.mode=true
< / pre > < / div >
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< span id = "thread" > < / span > < h2 > thread命令支持指定采样时间< a class = "headerlink" href = "#thread" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > thread命令计算线程cpu占用的逻辑， ， ， < code class = "docutils literal notranslate" > < span class = "pre" > ms< / span > < / code > 为单位)， < / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > $ thread -i 1000
Threads Total: 74, NEW: 0, RUNNABLE: 17, BLOCKED: 0, WAITING: 15, TIMED_WAITING: 42, TERMINATED: 0
ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTED DAEMON
78 com.taobao.config.client.timer main 5 TIMED_WAITING 22 0:0 false true
92 Abandoned connection cleanup thread main 5 TIMED_WAITING 15 0:2 false true
361 as-command-execute-daemon system 10 RUNNABLE 14 0:0 false true
67 HSF-Remoting-Timer-10-thread-1 main 10 TIMED_WAITING 12 0:2 false true
113 JamScheduleThread system 9 TIMED_WAITING 2 0:0 false true
14 Thread-3 main 5 RUNNABLE 2 0:0 false false
81 com.taobao.remoting.TimerThread main 5 TIMED_WAITING 2 0:0 false true
104 http-bio-7001-AsyncTimeout main 5 TIMED_WAITING 2 0:0 false true
123 nioEventLoopGroup-2-1 system 10 RUNNABLE 2 0:0 false false
127 nioEventLoopGroup-3-2 system 10 RUNNABLE 2 0:0 false false
345 nioEventLoopGroup-3-3 system 10 RUNNABLE 2 0:0 false false
358 nioEventLoopGroup-3-4 system 10 RUNNABLE 2 0:0 false false
27 qos-boss-1-1 main 5 RUNNABLE 2 0:0 false true
22 EagleEye-AsyncAppender-Thread-BizLog main 5 TIMED_WAITING 1 0:0 false true
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< span id = "trace" > < / span > < h2 > trace命令自动高亮显示最耗时方法调用< a class = "headerlink" href = "#trace" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > trace命令现在会自动显示< / p >
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