的数据
从jmap结果中我们可以看到，空闲堆大小（高达90%）超过了MaxHeapFreeRatio（40%），但是jvm仍然没有缩小。
这是JVM信息：www.example.com = OpenJDK 64位服务器VM java. vm. version = 25.352-b1 java. runtime. version = 1.8.0_352-b1
VM标志：非默认VM标志：- XX：CICompilerCount = 2-XX：CompressedClassSpaceSize = 1065353216-XX：ConcGCThreads = 1-XX：G1HeapRegionSize = 1048576-XX：+ HeapDumpOnOutOfMemoryError-XX：HeapDumpPath = null-XX：InitialHeapSize = 2577399808-XX：InitialRAMPercentage = null-XX：MarkStackSize = 4194304-XX：MaxHeapFreeRatio = 40-XX：MaxHeapSize = 6014631936-XX：MaxMetaspaceSize = 1073741824-XX：MaxNewSize = 3608150016-XX：MaxRAMPpercentage = null-XX：MetaspaceSize = 536870912-XX：MinHeapDeltaBytes = 1048576-XX：MinHeapFreeRatio = 20-XX：MinRAMPercentage = null-XX：+ PrintGC-XX：+ PrintGCDateStamps-XX：+ PrintGCDetails-XX：+ PrintGCTimeStamps-XX：存活率= 6-XX：+ UseAdaptiveSizePolicy-XX：+ UseCompressedClassPointers-XX：+ UseCompressedOops-XX：+ UseContainerSupport-XX：+使用G1GC-XX：+使用UTF8UTF16内部
命令行：- Duser timezone = GMT +8-Dfile。encoding = utf-8-XX：+ UseContainerSupport-XX：InitialRAM百分比= 30.0-XX：MinRAM百分比= 70.0-XX：MaxRAM百分比= 70.0-XX：+ UseAdaptiveSizePolicy-XX：MaxHeapFreeRatio = 40-XX：MinHeapFreeRatio = 20-XX：+使用G1GC-XX：+ HeapDumpOnOutOfMemoryError-XX：HeapDumpPath =/logs/my-heap-dump。hprof-XX：存活率= 6-XX：元空间大小= 512m-XX：MaxMetaspaceSize = 1024m-Xloggc：/logs/gc.log-XX：+ PrintGCDetails-XX：+ PrintGCDateStamps-Djava.安全egd =文件：/dev/。/urandom

• XX：+UseAdaptiveSizePolicy-XX：MaxHeapFreeRatio = 40-XX：MinHeapFreeRatio = 20
  有了这些论点，我认为jvm应该根据堆思想内存动态收缩。