我正在运行一个基于Java的应用程序，由于内存不足而崩溃。hs_err:
的一些输出片段#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 24696061952 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=
# This output file may be truncated or incomplete.
#
# Out of Memory Error
#
# JRE version: (8.0_275-b01) (build )
# Java VM: OpenJDK 64-Bit Server VM
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
但是当我采取堆转储它显示内存约8GB。我的jvm参数是:-Xmx30720m -Xms30720m -Xmn7168m -Xss8m
top命令显示
PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20 0 82.7g 36g 33m S 10.6 61.9 63594:19 java
/proc/meminfo
/proc/meminfo:
MemTotal: 61833192 kB
MemFree: 2235872 kB
MemAvailable: 20808016 kB
Buffers: 213036 kB
Cached: 17876428 kB
SwapCached: 0 kB
Active: 55994452 kB
Inactive: 1816412 kB
Active(anon): 39721444 kB
Inactive(anon): 132 kB
Active(file): 16273008 kB
Inactive(file): 1816280 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 1312 kB
Writeback: 0 kB
AnonPages: 39721564 kB
Mapped: 107292 kB
Shmem: 140 kB
Slab: 1280320 kB
SReclaimable: 1121808 kB
SUnreclaim: 158512 kB
KernelStack: 67824 kB
PageTables: 103072 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 30916596 kB
Committed_AS: 75073316 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 12288 kB
DirectMap2M: 62902272 kB
我不明白如何在这里调试，因为堆转储中没有显示任何内容，堆转储比健康运行的应用程序的堆转储要小。知道如何识别程序的哪一部分占用了内存吗?
您已经使用-Xms来强制JVM在启动时获得~30GB的空间。
它已经尝试过了，但是失败了。它只获得了8GB。它需要另外22 GB，但无法获得。这就是错误信息告诉你的。这与显示堆只有8GB的转储一致。
你要求的比操作系统提供的要多。你需要弄清楚在操作系统中发生了什么。
您的应用程序代码可能不涉及。JVM仍在根据您的命令行选项初始化它的堆。