Java 程序无法映射本机内存分配

Question

即使有足够的 RAM 可用，Java 程序也无法分配本机内存。程序因 os_commit 异常而失败后反复崩溃。任何更新以调整 Java Heap 等的建议。## There is insufficient memory for the Java Runtime Environment to continue.# Native memory allocation (mmap) failed to map 12288 bytes for committing reserved memory.# Possible reasons:#   The system is out of physical RAM or swap space#   In 32 bit mode, the process size limit was hit# Possible solutions:#   Reduce memory load on the system#   Increase physical memory or swap space#   Check if swap backing store is full#   Use 64 bit Java on a 64 bit OS#   Decrease Java heap size (-Xmx/-Xms)#   Decrease number of Java threads#   Decrease Java thread stack sizes (-Xss)#   Set larger code cache with -XX:ReservedCodeCacheSize=# This output file may be truncated or incomplete.##  Out of Memory Error (os_linux.cpp:2627), pid=35462, tid=140393234093824## JRE version: Java(TM) SE Runtime Environment (8.0_65-b17) (build 1.8.0_65-b17)# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.65-b01 mixed mode linux-amd64 compressed oops)# Core dump written. Default location: /usr/hdp/share/hst/activity-analyzer/core or core.35462#根据日志，您可以看到有足够的可用内存Memory: 4k page, physical 264266920k(135968600k free), swap 8393468k(8393468k free)vm_info: Java HotSpot(TM) 64-Bit Server VM (25.65-b01) for linux-amd64 JRE (1.8.0_65-b17), built on Oct  6 2015 17:16:12 by "java_re" with gcc 4.3.0 20080428 (Red Hat 4.3.0-8)time: Tue Feb  5 05:54:26 2019elapsed time: 2928 seconds (0d 0h 48m 48s)资源利用率# free -mg             total       used       free     shared    buffers     cachedMem:           252        134        117          0          0         25-/+ buffers/cache:        108        143Swap:            8          0          8JMap 输出# jmap -heap 2820Attaching to process ID 2820, please wait...Debugger attached successfully.Server compiler detected.JVM version is 25.65-b01using thread-local object allocation.Parallel GC with 33 thread(s)

Answer 1

您可能会受到此影响

根据帖子建议的解决方法：

这里有两种可能的解决方法

1. 禁用压缩的 Oops (-XX:-UseCompressedOops) 会带来轻微的性能损失。这将指示 JVM 在没有 Compressed Oops 功能的情况下运行，并且不会尝试将 Java 堆放入前 4GB 堆中

2. 保留 CompressedOops 并使用 JVM 选项 -XX:HeapBaseMinAddress=n 设置 Java Heap 的基址，以指定 Java Heap 应该开始的地址，将其设置为更高的地址，以便有足够的空间可用于本机 malloc