SpringBoot内存不足，无法运行Java运行时环境

Question

我在5个线程中执行了超过30000个REST请求(每个线程6,000个)，在SpringBoot中运行在Tomcat之上的Swagger，在运行35分钟后得到下一个错误：

#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 16384 bytes for committing reserved memory.
# Possible reasons:
#   The system is out of physical RAM or swap space
#   The process is running with CompressedOops enabled, and the Java Heap may be blocking the growth of the native heap
# Possible solutions:
#   Reduce memory load on the system
#   Increase physical memory or swap space
#   Check if swap backing store is full
#   Decrease Java heap size (-Xmx/-Xms)
#   Decrease number of Java threads
#   Decrease Java thread stack sizes (-Xss)
#   Set larger code cache with -XX:ReservedCodeCacheSize=
#   JVM is running with Zero Based Compressed Oops mode in which the Java heap is
#     placed in the first 32GB address space. The Java Heap base address is the
#     maximum limit for the native heap growth. Please use -XX:HeapBaseMinAddress
#     to set the Java Heap base and to place the Java Heap above 32GB virtual address.
# This output file may be truncated or incomplete.
#
#  Out of Memory Error (os_linux.cpp:2985), pid=24780, tid=58785
#
# JRE version: OpenJDK Runtime Environment (11.0.11+9) (build 11.0.11+9-Ubuntu-0ubuntu2.20.04)
# Java VM: OpenJDK 64-Bit Server VM (11.0.11+9-Ubuntu-0ubuntu2.20.04, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)

Command Line: -Xverify:none -XX:TieredStopAtLevel=1 -Xms2g -Xmx10g com.CamelSpringBootApplication

Host: Common KVM processor, 16 cores, 28G, Ubuntu 20.04.2 LTS
Time: Mon May 31 15:40:22 2021 CEST elapsed time: 2122.252495 seconds (0d 0h 35m 22s)

我遗漏了一些信息，也不知道原因。我在哪里犯了错？到底是什么占用了这么多内存，我如何在运行时释放内存？

只有在重新启动虚拟机后，内存才会恢复到64 VM。在我再次启动SpringBoot应用程序后，内存甚至在运行REST请求之前就开始下降。我需要支持尽可能多的REST请求，保留内存并防止SpringBoot应用程序崩溃。

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更新：

这些是收集的堆转储的结果。我已经在heaphero.io中加载了heapdump.bin。我将感谢任何基于此结果的提示。

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Answer 1

这只是一个危险的猜测，在计算了大约30000个垃圾收集数量的四分之一之后，你可能超过了垃圾收集，调用System.gc()；来通知垃圾收集。This i wrote位于内存中，需要一个小的垃圾管理检查和计数器。

Answer 2

我希望你已经分配了足够的堆大小，即使你的Linux机器有64 GB的RAM，你也需要根据应用程序的传入流量从外部扩展它的默认容量。

您可以在pom.xml文件中增加spring boot应用程序的堆大小，如下所示：

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <configuration>
        <jvmArguments>-Xmx4096m</jvmArguments>
    </configuration>
</plugin>