| [备忘]jdk8默认gc方式 | ||
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| 添加日期：2023/9/4 18:25:48 | 快速返回 返回列表 | 阅读291次 |
可以用这个命令打印出来： java -XX:+PrintCommandLineFlags -version -------------------------------- 可以用jstack打印出线程堆栈 默认gc是这样： "VM Thread" os_prio=2 tid=0x0000000017784000 nid=0x592c runnable "GC task thread#0 (ParallelGC)" os_prio=0 tid=0x0000000001d0b000 nid=0x42b8 runnable "GC task thread#1 (ParallelGC)" os_prio=0 tid=0x0000000001d0c800 nid=0x3e3c runnable "GC task thread#2 (ParallelGC)" os_prio=0 tid=0x0000000001d0e000 nid=0x4f10 runnable "GC task thread#3 (ParallelGC)" os_prio=0 tid=0x0000000001d0f000 nid=0x411c runnable "VM Periodic Task Thread" os_prio=2 tid=0x00000000178cb800 nid=0x176c waiting on condition JNI global references: 270 使用cms（-XX:+UseConcMarkSweepGC）是这样： "VM Thread" os_prio=2 tid=0x00000000183fe000 nid=0x4ef8 runnable "Gang worker#0 (Parallel GC Threads)" os_prio=2 tid=0x0000000002734000 nid=0x5bd0 runnable "Gang worker#1 (Parallel GC Threads)" os_prio=2 tid=0x0000000002737800 nid=0x3904 runnable "Gang worker#2 (Parallel GC Threads)" os_prio=2 tid=0x0000000002739800 nid=0x4d84 runnable "Gang worker#3 (Parallel GC Threads)" os_prio=2 tid=0x000000000273b800 nid=0x43d4 runnable "Concurrent Mark-Sweep GC Thread" os_prio=2 tid=0x0000000002782800 nid=0x231c runnable "VM Periodic Task Thread" os_prio=2 tid=0x0000000018c4f000 nid=0x5144 waiting on condition JNI global references: 270 很明显的，多了一个Concurrent Mark-Sweep GC Thread线程。 |
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