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title="文章字数">字数总计:</span><span class="word-count" title="文章字数">571</span><span class="post-meta-separator"></span><i class="anzhiyufont anzhiyu-icon-clock post-meta-icon" title="阅读时长"></i><span class="post-meta-label" title="阅读时长">阅读时长:</span><span>2分钟</span></span><span class="post-meta-separator"></span><span class="post-meta-pv-cv" id="" data-flag-title="java内存分析命令"><i class="anzhiyufont anzhiyu-icon-fw-eye post-meta-icon"></i><span class="post-meta-label" title="阅读量">阅读量:</span><span id="busuanzi_value_page_pv"><i class="anzhiyufont anzhiyu-icon-spinner anzhiyu-spin"></i></span></span><span class="post-meta-separator"> </span><span class="post-meta-position" title="作者IP属地为北京"><i class="anzhiyufont anzhiyu-icon-location-dot"></i>北京</span></div></div></div><section class="main-hero-waves-area waves-area"><svg class="waves-svg" xmlns="http://www.w3.org/2000/svg" xlink="http://www.w3.org/1999/xlink" viewBox="0 24 150 28" preserveAspectRatio="none" shape-rendering="auto"><defs><path 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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="2025-02-10T13:31:54.756Z" title="更新于 2025-02-10 21:31:54">2025-02-10</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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let img = document.querySelector("#workboard .workSituationImg");
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img.title = "下班了就该开开心心的玩耍，嘿嘿~";
img.alt = "下班了就该开开心心的玩耍，嘿嘿~";
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currentTimeHtml = `本站居然运行了 ${dnum} 天<span id='runtime'> ${hnum} 小时 ${mnum} 分 ${snum} 秒 </span><i class='anzhiyufont anzhiyu-icon-heartbeat' style='color:red'></i>`;
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nick: '你的专属昵称',
nickError: '昵称太短啦！至少得有3个字符才能算数哦！',
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',
wordHint: '评论字数要在0到1字之间哦！\n现在你已经写了$2个字了，加油！',
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！😜'
};
let initFn = window.walineFn || null
const initWaline = (Fn) => {
const waline = Fn(Object.assign({
el: '#waline-wrap',
serverURL: 'https://bc.ctext.top/',
pageview: false,
dark: 'html[data-theme="dark"]',
path: window.location.pathname,
comment: false,
imageUploader: true,
comment: false,
copyright: false,
reaction: true,
locale
}, null))
const destroyWaline = () => {
waline.destroy()
}
anzhiyu.addGlobalFn('pjax', destroyWaline, 'destroyWaline')
}
const loadWaline = async () => {
if (initFn) initWaline(initFn)
else {
await getCSS('https://cdn.cbd.int/@waline/[email protected]/dist/waline.css')
if (false) await getCSS('https://cdn.cbd.int/@waline/[email protected]/dist/waline-meta.css')
const { init } = await import('https://cdn.cbd.int/@waline/[email protected]/dist/waline.js')
initFn = init || Waline.init
initWaline(initFn)
window.walineFn = initFn
}
}
if ('Waline' === 'Waline' || !true) {
if (true) anzhiyu.loadComment(document.getElementById('waline-wrap'),loadWaline)
else setTimeout(loadWaline, 0)
} else {
window.loadOtherComment = loadWaline
}
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const changeContent = content => {
if (content === '') return content
content = content.replace(/<img.*?src="(.*?)"?[^\>]+>/ig, '[图片]') // replace image link
content = content.replace(/<a[^>]+?href=["']?([^"']+)["']?[^>]*>([^<]+)<\/a>/gi, '[链接]') // replace url
content = content.replace(/<pre><code>.*?<\/pre>/gi, '[代码]') // replace code
content = content.replace(/<[^>]+>/g,"") // remove html tag
if (content.length > 150) {
content = content.substring(0,150) + '...'
}
return content
}
const generateHtml = array => {
let result = ''
if (array.length) {
for (let i = 0; i < array.length; i++) {
result += '<div class=\'aside-list-item\'>'
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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')
$dom.textContent= "无法获取评论，请确认相关配置是否正确"
}
}
const newestCommentInit = () => {
if (document.querySelector('#card-newest-comments .aside-list')) {
const data = saveToLocal.get('waline-newest-comments')
if (data) {
generateHtml(JSON.parse(data))
} else {
getComment()
}
}
}
newestCommentInit()
document.addEventListener('pjax:complete', newestCommentInit)
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anzhiyu.removeGlobalFnEvent('pjax')
anzhiyu.removeGlobalFnEvent('themeChange')
document.getElementById('rightside').classList.remove('rightside-show')
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typeof typed === 'object' && typed.destroy()
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$bodyClassList.contains('read-mode') && $bodyClassList.remove('read-mode')
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window.refreshFn()
document.querySelectorAll('script[data-pjax]').forEach(item => {
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Array.from(item.attributes).forEach(attr => newScript.setAttribute(attr.name, attr.value))
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item.parentNode.replaceChild(newScript, item)
})
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typeof panguInit === 'function' && panguInit()
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