JVM -XX:MaxRAMPercentage 未在容器中应用

Question

我正在尝试运行需要大堆的 Java 应用程序。 它在容器内的 AWS ECS 上运行。 在具有 128GB RAM 的主机上。 容器分配了 ~115GB。

Dockerfile是基于eclipse-temurin:11

我使用选项-XX:MaxRAMPercentage=85.0和-XX:+PrintFlagsFinal以获得反馈。 这是我删节的内容（对于 SO 来说太大了）这里有完整的标志https://pastebin.com/jm7Md2c8

2023-01-17 11:02:40      bool MaxFDLimit                               = true                                      {product} {default}
2023-01-17 11:02:40     uintx MaxGCMinorPauseMillis                    = 18446744073709551615                      {product} {default}
2023-01-17 11:02:40     uintx MaxGCPauseMillis                         = 200                                       {product} {default}
2023-01-17 11:02:40     uintx MaxHeapFreeRatio                         = 70                                     {manageable} {default}
2023-01-17 11:02:40    size_t MaxHeapSize                              = 32178700288                               {product} {ergonomic}
2023-01-17 11:02:40      intx MaxInlineLevel                           = 15                                        {product} {default}
2023-01-17 11:02:40      intx MaxInlineSize                            = 35                                        {product} {default}
2023-01-17 11:02:40    size_t MaxMetaspaceExpansion                    = 5451776                                   {product} {default}
2023-01-17 11:02:40     uintx MaxMetaspaceFreeRatio                    = 70                                        {product} {default}
2023-01-17 11:02:40    size_t MaxMetaspaceSize                         = 18446744073709547520                      {product} {default}
2023-01-17 11:02:40    size_t MaxNewSize                               = 19306381312                               {product} {ergonomic}
2023-01-17 11:02:40      intx MaxNodeLimit                             = 80000                                  {C2 product} {default}
2023-01-17 11:02:40  uint64_t MaxRAM                                   = 137438953472                           {pd product} {default}
2023-01-17 11:02:40     uintx MaxRAMFraction                           = 4                                         {product} {default}
2023-01-17 11:02:40    double MaxRAMPercentage                         = 85.000000                                 {product} {command line}
2023-01-17 11:02:40      intx MaxRecursiveInlineLevel                  = 1                                         {product} {default}
2023-01-17 11:02:40     uintx MaxTenuringThreshold                     = 15                                        {product} {default}
2023-01-17 11:02:40      intx MaxTrivialSize                           = 6                                         {product} {default}
2023-01-17 11:02:40      intx MaxVectorSize                            = 32                                     {C2 product} {default}
2023-01-17 11:02:40    size_t MetaspaceSize                            = 21807104                               {pd product} {default}
2023-01-17 11:02:40      bool MethodFlushing                           = true                                      {product} {default}
2023-01-17 11:02:40    size_t MinHeapDeltaBytes                        = 4194304                                   {product} {ergonomic}
2023-01-17 11:02:40     uintx MinHeapFreeRatio                         = 40                                     {manageable} {default}
2023-01-17 11:02:40      intx MinInliningThreshold                     = 250                                       {product} {default}
2023-01-17 11:02:40      intx MinJumpTableSize                         = 10                                  {C2 pd product} {default}
2023-01-17 11:02:40    size_t MinMetaspaceExpansion                    = 339968                                    {product} {default}
2023-01-17 11:02:40     uintx MinMetaspaceFreeRatio                    = 40                                        {product} {default}
2023-01-17 11:02:40     uintx MinRAMFraction                           = 2                                         {product} {default}
2023-01-17 11:02:40    double MinRAMPercentage                         = 50.000000                                 {product} {default}
2023-01-17 11:02:40     uintx MinSurvivorRatio                         = 3                                         {product} {default}
2023-01-17 11:02:40      bool UseContainerSupport                      = true                                      {product} {default}

所以这似乎是合理的，JVM 检测到主机 ram MaxRAM = 137438953472 = 128GB 选项MaxRAMPercentage = 85.000000已正确设置。 UseContainerSupport = true所以我的理解是应该应用这些选项。

所以我不明白为什么MaxHeapSize = 32178700288只有 ~29.9GB？ 我认为它分配给容器的 115GB 的 1/4 这似乎暗示我的设置没有被应用，为什么？

在本地测试

docker run --memory='2g' eclipse-temurin:11 java -XX:MaxRAMPercentage=85.0 -XX:+PrintFlagsFinal -version | grep MaxHeapSize

当改变分配的容器 memory 和MaxRAMPercentage时，似乎按预期工作

Answer 1

感谢安德烈。 解决方案是添加-XX:-UseCompressedOops