内存不足，无法运行 Java Runtime 环境继续

Question

我有一个带有 4 GB RAM 和 Windows 操作系统的系统。我安装了 VMWare 来设置具有 2GB RAM 的 Ubuntu 虚拟机。在 Ubuntu 中，我打开 Eclipse 并开始编码，Eclipse 开始一次又一次地关闭，我开始收到以下错误：

 There is insufficient memory for the Java Runtime Environment to continue.     Native memory allocation (mmap) failed to map 28311552 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:2640), pid=4608, tid=0x6dc6eb40

 JRE version: Java(TM) SE Runtime Environment (8.0_161-b12) (build 1.8.0_161-b12)
 Java VM: Java HotSpot(TM) Client VM (25.161-b12 mixed mode linux-x86 )
 Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again


---------------  T H R E A D  ---------------

Current thread (0x099ab400):  VMThread [stack: 0x6dbee000,0x6dc6f000] [id=4629]

Stack: [0x6dbee000,0x6dc6f000],  sp=0x6dc6d240,  free space=508k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x5bffaf]  VMError::report_and_die()+0x16f
V  [libjvm.so+0x20e115]  report_vm_out_of_memory(char const*, int, unsigned int, VMErrorType, char const*)+0x55
V  [libjvm.so+0x4a2686]  os::Linux::commit_memory_impl(char*, unsigned int, bool)+0xe6
V  [libjvm.so+0x4a2afd]  os::pd_commit_memory_or_exit(char*, unsigned int, unsigned int, bool, char const*)+0x2d
V  [libjvm.so+0x49c660]  os::commit_memory_or_exit(char*, unsigned int, unsigned int, bool, char const*)+0x30
V  [libjvm.so+0x2741ad]  G1PageBasedVirtualSpace::commit_internal(unsigned int, unsigned int)+0x9d
V  [libjvm.so+0x27440c]  G1PageBasedVirtualSpace::commit(unsigned int, unsigned int)+0xfc
V  [libjvm.so+0x276a68]  G1RegionsLargerThanCommitSizeMapper::commit_regions(unsigned int, unsigned int)+0x28
V  [libjvm.so+0x2bc2ba]  HeapRegionManager::commit_regions(unsigned int, unsigned int)+0x5a
V  [libjvm.so+0x2bd343]  HeapRegionManager::make_regions_available(unsigned int, unsigned int)+0x23
V  [libjvm.so+0x2bd851]  HeapRegionManager::expand_by(unsigned int)+0xa1
V  [libjvm.so+0x250a7c]  G1CollectedHeap::expand(unsigned int)+0x11c
V  [libjvm.so+0x25b3fa]  G1CollectedHeap::do_collection_pause_at_safepoint(double)+0xd5a
V  [libjvm.so+0x5cbafe]  VM_G1IncCollectionPause::doit()+0x6e
V  [libjvm.so+0x5caad7]  VM_Operation::evaluate()+0x47
V  [libjvm.so+0x5c8ba3]  VMThread::evaluate_operation(VM_Operation*)+0xb3
V  [libjvm.so+0x5c8f40]  VMThread::loop()+0x1b0
V  [libjvm.so+0x5c93a5]  VMThread::run()+0x85
V  [libjvm.so+0x4a5219]  java_start(Thread*)+0x119
C  [libpthread.so.0+0x6295]  start_thread+0xe5

VM_Operation (0xbfbfede0): G1IncCollectionPause, mode: safepoint, requested by thread 0x0988f800

--------------  P R O C E S S  ---------------

Answer 1

Java 虚拟机进程内存不足。

你可以做的有几种可能性。在我看来，如果您想保留当前对流程的限制，以下可能性是最有希望的：

• 减少 Java 堆大小 (-Xmx/-Xms)：
  在 eclipse.ini 中可能有类似 @987654325 这样的行@ 您可以替换为例如 -Xmx640m。试试哪个最大堆空间仍然足以满足您的需求。确保-Xms 不大于-Xmx。
• 当且仅当您有 64 位系统时，您可以使用 Eclipse 64 位和 Eclipse OpenJ9 而不是 Eclipse 32 位和 Java HotSpot 32 位 VM 您当前正在使用。默认情况下，OpenJ9 在内存消耗方面效率更高，也可以在这方面进一步调整。

Use 64 bit Java on a 64 bit OS 的可能性似乎在这里给出不正确，因为 64 位 Java VM 可以寻址更多内存，但内存效率低于等效的 32 位 VM。

Answer 2

您的可用内存太少，无法用于 Eclipse。最好是用更多的内存升级你的系统。

除非您有充分的理由不使用虚拟框直接在 windows 下使用 eclipse。如果您必须使用 Ubuntu，请考虑使用 32 位版本的 Ubuntu、Java 和 eclipse，或者将 Ubuntu 安装在 Windows 旁边，这样您就可以启动它并拥有所有内存。