https://blog.liuyi2026.asia/zh/tags/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3Java%E8%99%9A%E6%8B%9F%E6%9C%BA/Recent content in 深入理解Java虚拟机 on 随记HugozhThu, 25 May 2023 20:04:33 +0000https://blog.liuyi2026.asia/zh/docs/technology/JVM/_understanding_the_jvm_/03/Thu, 25 May 2023 20:04:33 +0000https://blog.liuyi2026.asia/zh/docs/technology/JVM/_understanding_the_jvm_/03/<blockquote class='book-hint '> <p>学习《深入理解Java虚拟机》，感谢作者！</p></blockquote><h3 id="代码清单3-9--xxmaxtenuringthreshod1说明">代码清单3-9 -XX:MaxTenuringThreshod=1说明<a class="anchor" href="#%e4%bb%a3%e7%a0%81%e6%b8%85%e5%8d%953-9--xxmaxtenuringthreshod1%e8%af%b4%e6%98%8e">#</a></h3> <table> <thead> <tr> <th></th> <th>Eden[8M]</th> <th>Survivor1[1M]</th> <th>Survivor2[1M]</th> <th>Old {10M}</th> </tr> </thead> <tbody> <tr> <td>初始</td> <td>allocation1[0.25M]，allocation2[4MB]</td> <td></td> <td></td> <td></td> </tr> <tr> <td>3执行时gc导致的变化</td> <td></td> <td>+allocation1[0.25M]</td> <td></td> <td>+allocation2[4MB]</td> </tr> <tr> <td>3执行后</td> <td>+allocation3[4MB]</td> <td>+allocation1[0.25M]</td> <td></td> <td>+allocation2[4MB]</td> </tr> <tr> <td>5执行时gc导致的变化</td> <td></td> <td></td> <td></td> <td>allocation2[4MB]，+allocation1[0.25M]</td> </tr> <tr> <td>5执行后</td> <td>+allocation3[4MB]</td> <td></td> <td></td> <td>allocation2[4MB]，+allocation1[0.25M]</td> </tr> </tbody> </table> <h3 id="代码清单3-9--xxmaxtenuringthreshod15说明">代码清单3-9 -XX:MaxTenuringThreshod=15说明<a class="anchor" href="#%e4%bb%a3%e7%a0%81%e6%b8%85%e5%8d%953-9--xxmaxtenuringthreshod15%e8%af%b4%e6%98%8e">#</a></h3> <table> <thead> <tr> <th></th> <th>Eden[8M]</th> <th>Survivor1[1M]</th> <th>Survivor2[1M]</th> <th>Old {10M}</th> </tr> </thead> <tbody> <tr> <td>初始</td> <td>allocation1[0.25M]，allocation2[4MB]</td> <td></td> <td></td> <td></td> </tr> <tr> <td>3执行时gc导致的变化</td> <td></td> <td>+allocation1[0.25M]</td> <td></td> <td>+allocation2[4MB]</td> </tr> <tr> <td>3执行后</td> <td>+allocation3[4MB]</td> <td>+allocation1[0.25M]</td> <td></td> <td>+allocation2[4MB]</td> </tr> <tr> <td>5执行时gc导致的变化</td> <td></td> <td>+allocation1[0.25M]</td> <td></td> <td>allocation2[4MB]</td> </tr> <tr> <td>5执行后</td> <td>+allocation3[4MB]</td> <td>+allocation1[0.25M]</td> <td></td> <td>allocation2[4MB]，+allocation1[0.25M]</td> </tr> </tbody> </table> <h3 id="代码清单3-10-说明">代码清单3-10 说明<a class="anchor" href="#%e4%bb%a3%e7%a0%81%e6%b8%85%e5%8d%953-10-%e8%af%b4%e6%98%8e">#</a></h3> <table> <thead> <tr> <th></th> <th>Eden[8M]</th> <th>Survivor1[1M]</th> <th>Survivor2[1M]</th> <th>Old {10M}</th> </tr> </thead> <tbody> <tr> <td>初始</td> <td>allocation1[0.25M]，<br >allocation2[[0.25M]，allocation3[4M]</td> <td></td> <td></td> <td></td> </tr> <tr> <td>4执行时gc导致的变化</td> <td></td> <td>+allocation1[0.25M]，<br >+allocation2[[0.25M]，</td> <td></td> <td>+allocation3[4MB]</td> </tr> <tr> <td>4执行后</td> <td>+allocation4[4MB]</td> <td>+allocation1[0.25M]，<br >+allocation2[[0.25M]，</td> <td></td> <td>+allocation3[4MB]</td> </tr> <tr> <td>6执行时gc导致的变化</td> <td></td> <td></td> <td></td> <td>allocation3[4MB]，<br >+allocation1[0.25M]，<br >+allocation2[[0.25M]，</td> </tr> <tr> <td>6执行后</td> <td>+allocation4[4MB]</td> <td></td> <td></td> <td>allocation3[4MB]，<br >+allocation1[0.25M]，<br >+allocation2[[0.25M]，</td> </tr> </tbody> </table> <h3 id="代码清单3-11-说明">代码清单3-11 说明<a class="anchor" href="#%e4%bb%a3%e7%a0%81%e6%b8%85%e5%8d%953-11-%e8%af%b4%e6%98%8e">#</a></h3> <h4 id="-xx-handlepromotionfailure-关">-XX:-HandlePromotionFailure 关<a class="anchor" href="#-xx-handlepromotionfailure-%e5%85%b3">#</a></h4> <table> <thead> <tr> <th></th> <th>Eden[8M]</th> <th>Survivor1[1M]</th> <th>Survivor2[1M]</th> <th>Old {10M}</th> </tr> </thead> <tbody> <tr> <td>初始</td> <td>allocation1[2M]，<br >allocation2[2M]，<br >allocation3[2M]<br >allocation1[null]，allocation4[2M]</td> <td></td> <td></td> <td></td> </tr> <tr> <td>5执行时gc导致的变化</td> <td></td> <td></td> <td></td> <td>+allocation2[2M]，+allocation3[2M] //总共4M</td> </tr> <tr> <td>5执行后</td> <td>+allocation4[2M]</td> <td></td> <td></td> <td>+allocation2[2M]，+allocation3[2M] //总共4M</td> </tr> <tr> <td>6-&gt;11</td> <td>allocation4[2M]<br >+allocation5[2M]，<br >+allocation6[2M]</td> <td></td> <td></td> <td>allocation2[2M]，<br >allocation3[2M] //总共4M，<br >此时老年代连续可用空间在6M（或者说小于6M）</td> </tr> <tr> <td>11执行时gc导致的变化</td> <td></td> <td></td> <td></td> <td>allocation3[4MB]，<br >+allocation1[0.25M]，<br >+allocation2[[0.25M]，</td> </tr> <tr> <td>11执行后</td> <td>+allocation7[2MB]</td> <td></td> <td></td> <td>allocation3[4MB]，<br >+allocation1[0.25M]，<br >+allocation2[[0.25M]，</td> </tr> </tbody> </table> <h1 id="说明">说明<a class="anchor" href="#%e8%af%b4%e6%98%8e">#</a></h1> <blockquote class='book-hint '> <ol> <li> <p>书籍版权归著者和出版社所有</p>