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itemtype="http://schema.org/Person">伴随</span><time itemprop="dateCreated datePublished" datetime="2024-02-27T13:35:00.000Z" title="发表于 2024-02-27 21:35:00">2024-02-27</time><time itemprop="dateCreated datePublished" datetime="2025-01-03T07:32:43.478Z" title="更新于 2025-01-03 15:32:43">2025-01-03</time></header><h1>java内存分析相关命令</h1>
<ol>
<li>输出java进程id</li>
</ol>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jps -l</span><br></pre></td></tr></table></figure>
<ol start="2">
<li>查看整个JVM内存状态</li>
</ol>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jmap -heap [pid]</span><br></pre></td></tr></table></figure>
<p><strong>Heap Configuration</strong>:</p>
<ul>
<li><code>MinHeapFreeRatio</code> (最小堆空闲比例): 0</li>
<li><code>MaxHeapFreeRatio</code> (最大堆空闲比例): 100</li>
<li><code>MaxHeapSize</code> (堆的最大大小): 805306368 (768.0MB)</li>
<li><code>NewSize</code> (新生代的大小): 88080384 (84.0MB)</li>
<li><code>MaxNewSize</code> (新生代的最大大小): 268435456 (256.0MB)</li>
<li><code>OldSize</code> (老年代的大小): 176160768 (168.0MB)</li>
<li><code>NewRatio</code> (新生代与老年代的比例): 2</li>
<li><code>SurvivorRatio</code> (Eden区与Survivor区的比例): 8</li>
<li><code>MetaspaceSize</code> (元空间的大小): 21807104 (20.796875MB)</li>
<li><code>CompressedClassSpaceSize</code> (压缩类空间的大小): 1073741824 (1024.0MB)</li>
<li><code>MaxMetaspaceSize</code> (元空间的最大大小): 17592186044415 MB</li>
<li><code>G1HeapRegionSize</code> (G1垃圾收集器的堆区域大小): 0 (0.0MB)</li>
</ul>
<p><strong>Heap Usage</strong>:</p>
<ul>
<li>
<p>PS Young Generation</p>
<p>(Parallel Scavenge的新生代):</p>
<ul>
<li>
<p>Eden Space(是新生代内存区域的一部分，用于存储新创建的对象)</p>
<ul>
<li><code>capacity</code> (总容量): 57671680 (55.0MB)</li>
<li><code>used</code> (已使用): 42573736 (40.601478576660156MB)</li>
<li><code>free</code> (剩余): 15097944 (14.398521423339844MB)</li>
<li><code>% used</code> (已使用百分比): 73.82087013938211%</li>
</ul>
</li>
<li>
<p>From Space(是新生代中的 Survivor 区域之一。当发生一轮垃圾收集时，存活的对象从 Eden 区或上一次垃圾收集的 Survivor 区被移动到 From Space)</p>
<ul>
<li><code>capacity</code> (总容量): 524288 (0.5MB)</li>
<li><code>used</code> (已使用): 65536 (0.0625MB)</li>
<li><code>free</code> (剩余): 458752 (0.4375MB)</li>
<li><code>% used</code> (已使用百分比): 12.5%</li>
</ul>
</li>
<li>
<p>To Space(是新生代中的另一个 Survivor 区域。在一次垃圾收集之后，存活的对象从 From Space 移动到 To Space。下一次垃圾收集时，From Space 和 To Space 的角色会互换)</p>
<ul>
<li><code>capacity</code> (总容量): 8388608 (8.0MB)</li>
<li><code>used</code> (已使用): 0 (0.0MB)</li>
<li><code>free</code> (剩余): 8388608 (8.0MB)</li>
<li><code>% used</code> (已使用百分比): 0.0%</li>
</ul>
</li>
</ul>
</li>
<li>
<p>PS Old Generation</p>
<p>(Parallel Scavenge的老年代):</p>
<ul>
<li><code>capacity</code> (总容量): 176160768 (168.0MB)</li>
<li><code>used</code> (已使用): 3216712 (3.0676956176757812MB)</li>
<li><code>free</code> (剩余): 172944056 (164.93230438232422MB)</li>
<li><code>% used</code> (已使用百分比): 1.826009296235584%</li>
</ul>
</li>
</ul>
<p><strong>Interned Strings</strong>:</p>
<ul>
<li><code>7333 interned Strings</code> (被Interned的字符串数): 占用了 619600 字节的内存。</li>
</ul>
<ol start="3">
<li>查看JVM堆中对象详细占用情况</li>
</ol>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jmap -histo [pid]</span><br></pre></td></tr></table></figure>
<ol start="4">
<li>导出整个JVM 中内存信息</li>
</ol>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash">live: 表示只包括活动对象。这意味着只有那些被认为是 <span class="string">"活动"</span> 或 <span class="string">"存活"</span> 的对象会被包括在堆转储中。</span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">非活动对象，即已经被垃圾收集器标记为可回收的对象，将不会出现在转储中。</span></span><br><span class="line">jmap -dump:：live,file=文件名.dump [pid]</span><br></pre></td></tr></table></figure>
<ul>
<li>导出后使用 jdk 自带工具 jvisualvm.exe 进行分析</li>
</ul>
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mail: '你的电子小信箱',
mailError: '哎呀，这不是一个合格的邮箱地址哦，请再检查一遍！',
link: '你有个酷酷的网址吗？',
optional: '这个嘛，想填就填，不填也行！',
placeholder: '吐槽一下？',
sofa: '来，坐沙发上，发表你的评论吧！',
submit: '一键发送，让世界听到你的声音！',
like: '点个赞，让TA知道你的心意！',
cancelLike: '哎呀，不小心点错了，取消赞！',
reply: '回复TA，开启一场对话吧！',
cancelReply: '等等，我话还没说完，取消回复！',
comment: '来，说说你的看法，让评论区热闹起来！',
refresh: '刷新一下，看看有啥新动态！',
more: '哇塞，还有更多精彩内容等你来加载！',
preview: '先睹为快，预览一下你的大作吧！',
emoji: '来，加点表情，让你的评论更生动！',
uploadImage: '上传你的美照，让大家一起欣赏！',
seconds: '刚刚才发的，新鲜出炉！',
minutes: '几分钟前，还热乎着呢！',
hours: '几小时前，热度还在哦！',
days: '几天前，但依旧值得一看！',
now: '哇塞，刚刚发的，快抢沙发！',
uploading: '稍等片刻，你的图片正在飞奔而来！',
login: '登录一下，解锁更多功能！',
logout: '拜拜了您嘞，下次再见！',
admin: '博主大人在此，谁敢造次！',
sticky: '置顶一下，让更多人看到你的精彩内容！',
word: '字',
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anonymous: '神秘人出没，猜猜是谁？',
level0: '潜水员，深藏不露！',
level1: '冒泡小能手，偶尔露个头！',
level2: '吐槽大师，一针见血！',
level3: '活跃分子，无处不在！',
level4: '话痨达人，说个不停！',
level5: '传说级大神，膜拜一下！',
gif: '动态表情包，让你的评论更有趣！',
gifSearchPlaceholder: '快来搜索你喜欢的表情包，让评论更生动！',
profile: '看看我的个人资料，了解一下我吧！',
approved: '审核通过，可以展示啦！',
waiting: '正在等待审核，别急哦！',
spam: '垃圾内容，走开走开！',
unsticky: '换个位置看看！',
oldest: '看看最早的评论！',
latest: '看看最新的动态！',
hottest: '看看哪条评论最火！',
reactionTitle: '快来对这篇文章发表你的看法吧，让博主知道你的想法！😜'
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}
const generateHtml = array => {
let result = ''
if (array.length) {
for (let i = 0; i < array.length; i++) {
result += '<div class=\'aside-list-item\'>'
if (true) {
const name = 'data-lazy-src'
result += `<a href='${array[i].url}' class='thumbnail'><img ${name}='${array[i].avatar}' alt='${array[i].nick}'></a>`
}
result += `<div class='content'>
<a class='comment' href='${array[i].url}' title='${array[i].content}'>${array[i].content}</a>
<div class='name'><span>${array[i].nick} / </span><time datetime="${array[i].date}">${anzhiyu.diffDate(array[i].date, true)}</time></div>
</div></div>`
}
} else {
result += '没有评论'
}
let $dom = document.querySelector('#card-newest-comments .aside-list')
$dom && ($dom.innerHTML= result)
window.lazyLoadInstance && window.lazyLoadInstance.update()
window.pjax && window.pjax.refresh($dom)
}
const getComment = async () => {
try {
const res = await fetch('https://bc.ctext.top/api/comment?type=recent&count=6', { method: 'GET' })
const result = await res.json()
const walineArray = result.data.map(e => {
return {
'content': changeContent(e.comment),
'avatar': e.avatar,
'nick': e.nick,
'url': e.url + '#' + e.objectId,
'date': e.time || e.insertedAt
}
})
saveToLocal.set('waline-newest-comments', JSON.stringify(walineArray), 10/(60*24))
generateHtml(walineArray)
} catch (err) {
console.error(err)
const $dom = document.querySelector('#card-newest-comments .aside-list')
$dom.textContent= "无法获取评论，请确认相关配置是否正确"
}
}
const newestCommentInit = () => {
if (document.querySelector('#card-newest-comments .aside-list')) {
const data = saveToLocal.get('waline-newest-comments')
if (data) {
generateHtml(JSON.parse(data))
} else {
getComment()
}
}
}
newestCommentInit()
document.addEventListener('pjax:complete', newestCommentInit)
})</script><script async data-pjax src="https://cdn.cbd.int/[email protected]/waterfall/waterfall.js"></script><script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/qrcodejs/1.0.0/qrcode.min.js"></script><script src="/js/anzhiyu/right_click_menu.js"></script><link rel="stylesheet" href="https://cdn.cbd.int/[email protected]/icon/ali_iconfont_css.css"><script async src="https://at.alicdn.com/t/c/font_4489064_ow7l1rcvcw.js?spm=a313x.manage_type_myprojects.i1.12.61783a81xP1PqH&file=font_4489064_ow7l1rcvcw.js"></script><script async data-pjax src="/js/imgloaded.js?1"></script><script src="https://cdn.staticfile.org/jquery/3.6.3/jquery.min.js"></script><script defer="true" src="/js/welcome.js"></script><script defer="true" src="/js/hideRolling.js"></script><script defer="true" src="/js/countdown.js"></script><script defer src="https://cdn.jsdelivr.net/combine/npm/jquery@latest/dist/jquery.min.js,gh/weilining/jsdelivr/jquery/circlemagic/circlemagic.min.js,gh/weilining/jsdelivr@latest/jquery/circlemagic/butterflycirclemagic.js"></script><script id="canvas_nest" defer="defer" color="0,0,255" opacity="0.7" zIndex="-1" count="99" mobile="false" src="https://cdn.cbd.int/[email protected]/dist/canvas-nest.min.js"></script><script id="click-heart" src="https://cdn.cbd.int/[email protected]/dist/click-heart.min.js" async="async" mobile="false"></script><link rel="stylesheet" href="https://cdn.cbd.int/[email protected]/aplayer/APlayer.min.css" media="print" onload="this.media='all'"><script src="https://cdn.cbd.int/[email protected]/js/APlayer.min.js"></script><script src="https://cdn.cbd.int/[email protected]/assets/js/Meting2.min.js"></script><script src="https://cdn.cbd.int/[email protected]/pjax.min.js"></script><script>let pjaxSelectors = ["head > title","#config-diff","#body-wrap","#rightside-config-hide","#rightside-config-show",".js-pjax"]
var pjax = new Pjax({
elements: 'a:not([target="_blank"])',
selectors: pjaxSelectors,
cacheBust: false,
analytics: false,
scrollRestoration: false
})
document.addEventListener('pjax:send', function () {
// removeEventListener scroll
anzhiyu.removeGlobalFnEvent('pjax')
anzhiyu.removeGlobalFnEvent('themeChange')
document.getElementById('rightside').classList.remove('rightside-show')
if (window.aplayers) {
for (let i = 0; i < window.aplayers.length; i++) {
if (!window.aplayers[i].options.fixed) {
window.aplayers[i].destroy()
}
}
}
typeof typed === 'object' && typed.destroy()
//reset readmode
const $bodyClassList = document.body.classList
$bodyClassList.contains('read-mode') && $bodyClassList.remove('read-mode')
})
document.addEventListener('pjax:complete', function () {
window.refreshFn()
document.querySelectorAll('script[data-pjax]').forEach(item => {
const newScript = document.createElement('script')
const content = item.text || item.textContent || item.innerHTML || ""
Array.from(item.attributes).forEach(attr => newScript.setAttribute(attr.name, attr.value))
newScript.appendChild(document.createTextNode(content))
item.parentNode.replaceChild(newScript, item)
})
GLOBAL_CONFIG.islazyload && window.lazyLoadInstance.update()
typeof panguInit === 'function' && panguInit()
// google analytics
typeof gtag === 'function' && gtag('config', '', {'page_path': window.location.pathname});
// baidu analytics
typeof _hmt === 'object' && _hmt.push(['_trackPageview',window.location.pathname]);
typeof loadMeting === 'function' && document.getElementsByClassName('aplayer').length && loadMeting()
// prismjs
typeof Prism === 'object' && Prism.highlightAll()
})
document.addEventListener('pjax:error', e => {
if (e.request.status === 404) {
pjax.loadUrl('/404.html')
}
})</script><script async data-pjax src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script><script charset="UTF-8" src="https://cdn.cbd.int/[email protected]/accesskey/accesskey.js"></script></div><div id="popup-window"><div class="popup-window-title">通知</div><div class="popup-window-divider"></div><div class="popup-window-content"><div class="popup-tip">你好呀</div><div class="popup-link"><i class="anzhiyufont anzhiyu-icon-arrow-circle-right"></i></div></div></div><!-- hexo injector body_end start --><script async src="//at.alicdn.com/t/font_2032782_8d5kxvn09md.js"></script><!-- hexo injector body_end end --></body></html>