本机内存分配 (mmap) 无法映射 [英] Native memory allocation (mmap) failed to map

问题描述

我已经开始面临本机内存分配问题.我想可能与 -Xmx 和 -Xms 设置有关.设置此值的推荐方法是什么?

I have started facing Native memory allocation issue. I guess could be related with the -Xmx and -Xms settings. What is the recommended way to set this values ?

目前我有:-Xmx13G -Xms6G

Currently I have: -Xmx13G -Xms6G

我读到建议设置相同的值，但没有解释原因.

I read that is recommended to set same values but without any explanation of why.

我得到的错误是:

    # There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 746061824 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
#   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=13528, tid=0x00007f2b0b5f5700
#
# JRE version: Java(TM) SE Runtime Environment (8.0_101-b13) (build 1.8.0_101-b13)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.101-b13 mixed mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#

/proc/meminfo:
MemTotal:       16433112 kB
MemFree:          166336 kB
Buffers:          114324 kB
Cached:           398396 kB
SwapCached:            0 kB
Active:         15151496 kB
Inactive:         254348 kB
Active(anon):   14893020 kB
Inactive(anon):      604 kB
Active(file):     258476 kB
Inactive(file):   253744 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                12 kB
Writeback:             0 kB
AnonPages:      14892976 kB
Mapped:            24024 kB
Shmem:               696 kB
Slab:             349384 kB
SReclaimable:     187700 kB
SUnreclaim:       161684 kB
KernelStack:       43520 kB
PageTables:       276768 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     8216556 kB
Committed_AS:   33089080 kB
VmallocTotal:   34359738367 kB
VmallocUsed:       31404 kB
VmallocChunk:   34359652884 kB
HardwareCorrupted:     0 kB
AnonHugePages:  13486080 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       28672 kB
DirectMap2M:    16879616 kB

Memory: 4k page, physical 16433112k(166336k free), swap 0k(0k free)

vm_info: Java HotSpot(TM) 64-Bit Server VM (25.101-b13) for linux-amd64 JRE (1.8.0_101-b13), built on Jun 22 2016 02:59:44 by "java_re" with gcc 4.3.0 20080428 (Red Hat 4.3.0-8)

推荐答案

您显然要求比系统上实际可用的要多得多.您总共有 16GB，但 90% 正在使用中，而且您没有任何交换空间，因此您无法获得 -Xms6G 更不用说更多 (-Xmx13G>).

You are clearly asking for a lot more than is physically available on your system. You have 16GB total but it's 90% in use, and you don't have any swap space, so there's no way you're getting -Xms6G let alone more (-Xmx13G).

您需要找出其他进程正在使用哪些内存，例如 top 并按常驻内存排序(大写字母 O，然后是 q)，并在运行 JVM 之前停止它们以释放至少 6GB 的空间.

You need to figure out what other processes are consuming memory using, for instance, top and sort by resident memory (upper-case letter O, then q), and stop enough of them to free up at least 6GB before running your JVM.

那样，或者将物理内存加倍到 32GB，或者添加 16GB 的交换空间(但如果系统负载过重，可能会导致抖动).

That, or double your physical memory to 32GB, or add 16GB of swap (but that could result in thrashing if the system is heavily loaded).

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