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< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < p > 这时命令在后台执行，可以在 console 中继续执行其他命令。< / p > < h2 id = "_2-通过-jobs-查看任务" tabindex = "-1" > < a class = "header-anchor" href = "#_2-通过-jobs-查看任务" aria-hidden = "true" > #< / a > 2. 通过 jobs 查看任务< / h2 > < p > 如果希望查看当前有哪些 arthas 任务在执行，可以执行 jobs 命令，执行结果如下< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > jobs< / span >
< span class = "token punctuation" > [< / span > < span class = "token number" > 10< / span > < span class = "token punctuation" > ]< / span > *
Stopped < span class = "token function" > watch< / span > com.taobao.container.Test < span class = "token builtin class-name" > test< / span > < span class = "token string" > " params[0].{? #this.name == null }" < / span > < span class = "token parameter variable" > -x< / span > < span class = "token number" > 2< / span >
execution count < span class = "token builtin class-name" > :< / span > < span class = "token number" > 19< / span >
start < span class = "token function" > time< / span > < span class = "token builtin class-name" > :< / span > Fri Sep < span class = "token number" > 22< / span > 09:59:55 CST < span class = "token number" > 2017< / span >
< span class = "token function" > timeout< / span > < span class = "token function" > date< / span > < span class = "token builtin class-name" > :< / span > Sat Sep < span class = "token number" > 23< / span > 09:59:55 CST < span class = "token number" > 2017< / span >
session < span class = "token builtin class-name" > :< / span > 3648e874-5e69-473f-9eed-7f89660b079b < span class = "token punctuation" > (< / span > current< span class = "token punctuation" > )< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 可以看到目前有一个后台任务在执行。< / p > < ul > < li > job id 是 10, < code > *< / code > 表示此 job 是当前 session 创建< / li > < li > 状态是 Stopped< / li > < li > execution count 是执行次数，从启动开始已经执行了 19 次< / li > < li > timeout date 是超时的时间，到这个时间，任务将会自动超时退出< / li > < / ul > < h2 id = "_3-任务暂停和取消" tabindex = "-1" > < a class = "header-anchor" href = "#_3-任务暂停和取消" aria-hidden = "true" > #< / a > 3. 任务暂停和取消< / h2 > < p > 当任务正在前台执行，比如直接调用命令< code > trace Test t< / code > 或者调用后台执行命令< code > trace Test t & < / code > 后又通过< code > fg< / code > 命令将任务转到前台。这时 console 中无法继续执行命令，但是可以接收并处理以下事件：< / p > < ul > < li > ‘ ’ ： < code > jbos< / code > 查看任务状态将会变为 Stopped， < code > bg < job-id> < / code > 或者< code > fg < job-id> < / code > 可让任务重新开始执行< / li > < li > ‘ ’ ： < / li > < li > ‘ ’ ： < / li > < / ul > < h2 id = "_4-fg、bg-命令-将命令转到前台、后台继续执行" tabindex = "-1" > < a class = "header-anchor" href = "#_4-fg、bg-命令-将命令转到前台、后台继续执行" aria-hidden = "true" > #< / a > 4. fg、bg 命令，将命令转到前台、后台继续执行< / h2 > < ul > < li > 任务在后台执行或者暂停状态（< code > ctrl + z< / code > 暂停任务）时，执行< code > fg < job-id> < / code > 将可以把对应的任务转到前台继续执行。在前台执行时，无法在 console 中执行其他命令< / li > < li > 当任务处于暂停状态时（< code > ctrl + z< / code > 暂停任务），执行< code > bg < job-id> < / code > 将可以把对应的任务在后台继续执行< / li > < li > 非当前 session 创建的 job， < / li > < / ul > < h2 id = "_5-任务输出重定向" tabindex = "-1" > < a class = "header-anchor" href = "#_5-任务输出重定向" aria-hidden = "true" > #< / a > 5. 任务输出重定向< / h2 > < p > 可通过< code > > < / code > 或者< code > > > < / code > 将任务输出结果输出到指定的文件中，可以和< code > & < / code > 一起使用，实现 arthas 命令的后台异步任务。比如：< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ trace Test t < span class = "token operator" > > > < / span > test.out < span class = "token operator" > & < / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < p > 这时 trace 命令会在后台执行，并且把结果输出到~/logs/arthas-cache/test.out。可继续执行其他命令。并可查看文件中的命令执行结果。< / p > < p > 当连接到远程的 arthas server 时， ， < / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ trace Test t < span class = "token operator" > > > < / span > < span class = "token operator" > & < / span >
job < span class = "token function" > id< / span > < span class = "token builtin class-name" > :< / span > < span class = "token number" > 2< / span >
cache location < span class = "token builtin class-name" > :< / span > /Users/gehui/logs/arthas-cache/28198/2
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 可以看到并没有指定重定向文件位置， ， < code > /Users/gehui/logs/arthas-cache/28198/2< / code > 中， < / p > < h2 id = "_6-停止命令" tabindex = "-1" > < a class = "header-anchor" href = "#_6-停止命令" aria-hidden = "true" > #< / a > 6. 停止命令< / h2 > < p > 异步执行的命令，如果希望停止，可执行< code > kill < job-id> < / code > < / p > < h2 id = "_7-其他" tabindex = "-1" > < a class = "header-anchor" href = "#_7-其他" aria-hidden = "true" > #< / a > 7. 其他< / h2 > < ul > < li > 最多同时支持 8 个命令使用重定向将结果写日志< / li > < li > 请勿同时开启过多的后台异步命令，以免对目标 JVM 性能造成影响< / li > < li > 如果不想停止 arthas， ， < code > quit< / code > 退出 arthas 控制台（< code > stop< / code > 会停止 arthas 服务）< / li > < / ul > < / div > <!-- [ --> <!-- ] --> < / div > < footer class = "page-meta right-menu-padding" data-v-fdd717e0 > < div class = "meta-item edit-link" > < a class = "external-link meta-item-label" href = "https://github.com/alibaba/arthas/edit/master/site/docs/doc/async.md" rel = "noopener noreferrer" target = "_blank" aria-label = "在 GitHub 上编辑此页" > <!-- [ --> <!-- ] --> < span > 在 GitHub 上编辑此页< / span > < span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > <!-- [ --> <!-- ] --> < / a > < / div > < div class = "meta-item last-updated" > < span class = "meta-item-label" > Last Updated: < / span > <!-- --> < / div > < div class = "meta-item contributors" > < span class = "meta-item-label" > 贡献者: < / span > < span class = "meta-item-info" > <!-- [ --> <!-- [ --> < span class = "contributor" title = "email: hengyunabc@gmail.com" > hengyunabc< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: hollowman186@vip.qq.com" > Hollow Man< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: 983433479@qq.com" > 汪吉< / span > <!-- --> <!-- ] --> <!-- ] --> < / span > < / div > < / footer > < nav class = "page-nav right-menu-padding" data-v-fdd717e0 > < p class = "inner" > <!-- --> < span class = "next" > < a href = "/doc/save-log.html" class = "" aria-label = "执行结果存日志" > <!-- [ --> <!-- ] --> 执行结果存日志 <!-- [ --> <!-- ] --> < / a > < / span > < / p > < / nav > <!-- [ --> <!-- ] --> < / main > <!-- ] --> < / div > <!-- --> <!-- ] --> < / div >
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