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class=algolia-stats><hr></div><div class=algolia-hits></div><div class=algolia-pagination></div></div></div></div></header></div><div class="main-inner page posts-expand"><div class=tool-workspace data-tool=memory data-tool-group=java lang=zh-CN><nav aria-label=面包屑 class=tool-breadcrumb><a href=/tools/><i class="fa fa-arrow-left" aria-hidden=true></i> 在线工具箱</a></nav><header class=tool-header><div><span class=tool-eyebrow>BROWSER-ONLY DIAGNOSTICS</span><h1>JVM 内存预算在线计算器</h1><p>估算 JVM Heap、Metaspace、Direct Memory、线程栈、Code Cache 和 Native Memory 的总占用与安全余量。</div><div class=tool-local-badge><i class="fa fa-shield-halved" aria-hidden=true></i><span>本地处理<small>不会上传文件</small></span></div></header><section class="tool-panel tool-input-panel" aria-labelledby=memory-input-title><div class=tool-panel-heading><div><h2 id=memory-input-title>填写运行预算</h2><p>单位统一为 MiB；容器环境请填写容器限制，而不是宿主机内存。</div><button class="tool-button tool-button-quiet" data-action=sample type=button>推荐示例</button></div><div class=tool-memory-form><label class=tool-field><span>可用内存</span><div class=tool-unit-input><input data-memory=limit min=256 step=256 type=number value=8192><em>MiB</em></div></label><label class=tool-field><span>最大堆 -Xmx</span><div class=tool-unit-input><input data-memory=heap min=64 step=128 type=number value=4096><em>MiB</em></div></label><label class=tool-field><span>Metaspace</span><div class=tool-unit-input><input data-memory=meta min=0 step=32 type=number value=256><em>MiB</em></div></label><label class=tool-field><span>Direct Memory</span><div class=tool-unit-input><input data-memory=direct min=0 step=64 type=number value=512><em>MiB</em></div></label><label class=tool-field><span>线程数量</span><div class=tool-unit-input><input data-memory=threads min=1 step=10 type=number value=300><em>个</em></div></label><label class=tool-field><span>单线程栈 -Xss</span><div class=tool-unit-input><input data-memory=xss min=128 step=128 type=number value=1024><em>KiB</em></div></label><label class=tool-field><span>Code Cache</span><div class=tool-unit-input><input data-memory=code min=0 step=32 type=number value=240><em>MiB</em></div></label><label class=tool-field><span>其他 Native 预留</span><div class=tool-unit-input><input data-memory=native min=0 step=64 type=number value=512><em>MiB</em></div></label></div><div class=tool-actions><button class="tool-button tool-button-primary" data-action=calculate type=button><i class="fa fa-calculator" aria-hidden=true></i> 计算预算</button><span class=tool-hint>估算值不包含文件页缓存和所有 JVM 内部结构</span></div></section><section aria-live=polite class=tool-results data-results hidden><div class=tool-section-heading><div><span>MEMORY BUDGET</span><h2>预算结果</h2></div><button class="tool-button tool-button-quiet" data-action=copy type=button>复制结果</button></div><div class=tool-budget><div class=tool-budget-ring data-ring><strong data-percent>0%</strong><span>预算占用</span></div><div class=tool-budget-summary><strong data-status></strong><p 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