<div class="qmbox"><div class="qmbox"><p style="font-family: -apple-system, "system-ui", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 10.5pt; color: rgb(46, 48, 51);">When using G1GC with jdk11u, I met some cases that g1gc failed to work well and seriously affected the Java application. Here are some details:</p><p style="font-family: -apple-system, "system-ui", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 10.5pt; color: rgb(46, 48, 51);"></p><ol style="padding-left: 36px;"><li>With objs promoted to old generation, as well as some humongous objs allocated, the old generation usage exceeds the threshold indicated by IHOP.</li><li>G1GC startups concurrent marking.</li><li>Concurrent marking is finished, but the Eden is not full and mixed GC can not be triggered.</li><li>Humongous objs keep being alllocated and finally cause a to-space exausted.</li><li>Eventually, G1 triggers a Full GC for collecting all objs.</li></ol><div><br  /></div><div>I've met plenty of cases which act the same as I described below. I'm confused that it looks like a wrong prediction for old generation growing. Is it fixed in higher JDK version? Or what should I do to deal with such problems. Looking forward to your reply!</div><div>Thanks!</div><p></p><div xmail-signature=""><xm-signature><hr xmail-signature="" style="margin: 0 0 10px 0;border: 0;border-bottom:1px solid #E6E8EB;height:0;line-height:0;font-size:0;padding: 20px 0 0 0;width: 50px;display: inline-block"  /><br  /><a title="" class="xm_write_card" id="in_alias" style="white-space: normal; display: inline-block; text-decoration: none !important;font-family: -apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei;" href="https://wx.mail.qq.com/home/index?t=readmail_businesscard_midpage&nocheck=true&name=%E5%8A%89%E4%BF%A0%E9%BA%9F&icon=http%3A%2F%2Fthirdqq.qlogo.cn%2Fg%3Fb%3Doidb%26k%3DnHNLWEt4HxvFOLdxeviaVzg%26kti%3DZVms9gAAAAA%26s%3D640%26t%3D1651630340&mail=beef.liu%40qq.com&code=Qn6vYwfmV5w7c6Swn2sUZ8kZyfovcI1J8C8hxlhWY9n6BnUHE6hyGJFlslMHmeG3V25VRBCb9R_g68_vQn1ONA" target="_blank"><table style="white-space: normal;table-layout: fixed; padding-right: 20px;" contenteditable="false" cellpadding="0" cellspacing="0"><tbody><tr valign="top"><td style="width: 40px;min-width: 40px; padding-top:10px"><div style="width: 38px; height: 38px; border: 1px #FFF solid; border-radius:50%; margin: 0;vertical-align: top;box-shadow: 0 0 10px 0 rgba(127,152,178,0.14);"><img src="http://thirdqq.qlogo.cn/g?b=oidb&k=nHNLWEt4HxvFOLdxeviaVzg&kti=ZVms9gAAAAA&s=640&t=1651630340" style="width:100%;height:100%;border-radius:50%;pointer-events: none;"  /></div></td><td style="padding: 10px 0 8px 10px;"><div class="businessCard_name" style="font-size: 14px;color: #33312E;line-height: 20px; padding-bottom: 2px; margin:0;font-weight: 500;">劉俠麟</div><div class="businessCard_mail" style="font-size: 12px;color: #999896;line-height: 18px; margin:0;">beef.liu@qq.com</div></td></tr></tbody></table></a></xm-signature><p></p></div></div><div xmail-signature=""><xm-signature><hr xmail-signature="" style="margin: 0 0 10px 0;border: 0;border-bottom:1px solid #E6E8EB;height:0;line-height:0;font-size:0;padding: 20px 0 0 0;width: 50px;display: inline-block"  /><br  /><a title="" class="xm_write_card" id="in_alias" style="white-space: normal; display: inline-block; text-decoration: none !important;font-family: -apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei;" href="https://wx.mail.qq.com/home/index?t=readmail_businesscard_midpage&nocheck=true&name=%E5%8A%89%E4%BF%A0%E9%BA%9F&icon=http%3A%2F%2Fthirdqq.qlogo.cn%2Fg%3Fb%3Doidb%26k%3DnHNLWEt4HxvFOLdxeviaVzg%26kti%3DZVms9gAAAAA%26s%3D640%26t%3D1651630340&mail=1245502106%40qq.com&code=" target="_blank"><table style="white-space: normal;table-layout: fixed; padding-right: 20px;" contenteditable="false" cellpadding="0" cellspacing="0"><tbody><tr valign="top"><td style="width: 40px;min-width: 40px; padding-top:10px"><div style="width: 38px; height: 38px; border: 1px #FFF solid; border-radius:50%; margin: 0;vertical-align: top;box-shadow: 0 0 10px 0 rgba(127,152,178,0.14);"><img src="http://thirdqq.qlogo.cn/g?b=oidb&k=nHNLWEt4HxvFOLdxeviaVzg&kti=ZVms9gAAAAA&s=640&t=1651630340" style="width:100%;height:100%;border-radius:50%;pointer-events: none;"  /></div></td><td style="padding: 10px 0 8px 10px;"><div class="businessCard_name" style="font-size: 14px;color: #33312E;line-height: 20px; padding-bottom: 2px; margin:0;font-weight: 500;">劉俠麟</div><div class="businessCard_mail" style="font-size: 12px;color: #999896;line-height: 18px; margin:0;">1245502106@qq.com</div></td></tr></tbody></table></a></xm-signature><p></p></div></div>