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< h1 > Arthas异步调用< a class = "headerlink" href = "#arthas" title = "永久链接至标题" > ¶< / a > < / h1 >
< p > arthas中的异步调用， < a class = "reference external" href = "https://ehlxr.me/2017/01/18/Linux-%E4%B8%AD-fg%E3%80%81bg%E3%80%81jobs%E3%80%81-%E6%8C%87%E4%BB%A4/" > linux任务相关介绍< / a > 。< / p >
< div class = "section" id = "id1" >
< h2 > 1. 使用& 在后台执行任务< a class = "headerlink" href = "#id1" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > 比如希望执行后台执行trace命令， < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > trace Test t & < / pre > < / div >
< / div >
< p > 这时命令在后台执行， < / p >
< / div >
< div class = "section" id = "jobs" >
< h2 > 2. 通过jobs查看任务< a class = "headerlink" href = "#jobs" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > 如果希望查看当前有哪些arthas任务在执行， ， < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ jobs
[10]*
Stopped watch com.taobao.container.Test test " params[0].{? #this.name == null }" -x 2
execution count : 19
start time : Fri Sep 22 09:59:55 CST 2017
timeout date : Sat Sep 23 09:59:55 CST 2017
session : 3648e874-5e69-473f-9eed-7f89660b079b (current)< / pre > < / div >
< / div >
< p > 可以看到目前有一个后台任务在执行。< / p >
< ul class = "simple" >
< li > < p > job id是10, < code class = "docutils literal notranslate" > < span class = "pre" > *< / span > < / code > 表示此job是当前session创建< / p > < / li >
< li > < p > 状态是Stopped< / p > < / li >
< li > < p > execution count是执行次数， < / p > < / li >
< li > < p > timeout date是超时的时间， ， < / p > < / li >
< / ul >
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< h2 > 3. 任务暂停和取消< a class = "headerlink" href = "#id2" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > 当任务正在前台执行，比如直接调用命令< code class = "docutils literal notranslate" > < span class = "pre" > trace< / span > < span class = "pre" > Test< / span > < span class = "pre" > t< / span > < / code > 或者调用后台执行命令< code class = "docutils literal notranslate" > < span class = "pre" > trace< / span > < span class = "pre" > Test< / span > < span class = "pre" > t< / span > < span class = "pre" > & < / span > < / code > 后又通过< code class = "docutils literal notranslate" > < span class = "pre" > fg< / span > < / code > 命令将任务转到前台。这时console中无法继续执行命令， ： < / p >
< ul class = "simple" >
< li > < p > ‘ ’ ： < code class = "docutils literal notranslate" > < span class = "pre" > jbos< / span > < / code > 查看任务状态将会变为Stopped， < code class = "docutils literal notranslate" > < span class = "pre" > bg< / span > < span class = "pre" > < job-id> < / span > < / code > 或者< code class = "docutils literal notranslate" > < span class = "pre" > fg< / span > < span class = "pre" > < job-id> < / span > < / code > 可让任务重新开始执行< / p > < / li >
< li > < p > ‘ ’ ： < / p > < / li >
< li > < p > ‘ ’ ： ， ， < / p > < / li >
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< h2 > 4. fg、bg命令， < a class = "headerlink" href = "#fgbg" title = "永久链接至标题" > ¶< / a > < / h2 >
< ul class = "simple" >
< li > < p > 任务在后台执行或者暂停状态（< code class = "docutils literal notranslate" > < span class = "pre" > ctrl< / span > < span class = "pre" > +< / span > < span class = "pre" > z< / span > < / code > 暂停任务）时，执行< code class = "docutils literal notranslate" > < span class = "pre" > fg< / span > < span class = "pre" > < job-id> < / span > < / code > 将可以把对应的任务转到前台继续执行。在前台执行时， < / p > < / li >
< li > < p > 当任务处于暂停状态时（< code class = "docutils literal notranslate" > < span class = "pre" > ctrl< / span > < span class = "pre" > +< / span > < span class = "pre" > z< / span > < / code > 暂停任务），执行< code class = "docutils literal notranslate" > < span class = "pre" > bg< / span > < span class = "pre" > < job-id> < / span > < / code > 将可以把对应的任务在后台继续执行< / p > < / li >
< li > < p > 非当前session创建的job， < / p > < / li >
< / ul >
< / div >
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< h2 > 5. 任务输出重定向< a class = "headerlink" href = "#id3" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > 可通过< code class = "docutils literal notranslate" > < span class = "pre" > > < / span > < / code > 或者< code class = "docutils literal notranslate" > < span class = "pre" > > > < / span > < / code > 将任务输出结果输出到指定的文件中，可以和< code class = "docutils literal notranslate" > < span class = "pre" > & < / span > < / code > 一起使用， ： < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ trace Test t > > test.out & < / pre > < / div >
< / div >
< p > 这时trace命令会在后台执行， < / p >
< p > 当连接到远程的arthas server时， ， ： < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ trace Test t > > &
job id : 2
cache location : /Users/gehui/logs/arthas-cache/28198/2< / pre > < / div >
< / div >
< p > 可以看到并没有指定重定向文件位置， ， ， ， ， < code class = "docutils literal notranslate" > < span class = "pre" > /Users/gehui/logs/arthas-cache/28198/2< / span > < / code > 中， < / p >
< / div >
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< h2 > 6. 停止命令< a class = "headerlink" href = "#id4" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > 异步执行的命令， ， < job-id > < / p >
< / div >
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< h2 > 7. 其他< a class = "headerlink" href = "#id5" title = "永久链接至标题" > ¶< / a > < / h2 >
< ul class = "simple" >
< li > < p > 最多同时支持8个命令< / p > < / li >
< li > < p > 请勿同时开启过多的后台异步命令， < / p > < / li >
< li > < p > 如果不想停止arthas， ， < code class = "docutils literal notranslate" > < span class = "pre" > quit< / span > < / code > 退出arthas控制台（ < code class = "docutils literal notranslate" > < span class = "pre" > stop< / span > < / code > 会停止arthas 服务）< / p > < / li >
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