我正在尝试为应用程序运行负载测试。为此，我在具有60GB Ram和超过足够CPU能力的Ubuntu
Vm上使用JMeter（v.2.13）。目标是达到通过WebSocket连接的1万名用户。

但是，在测试运行期间，我在ssh控制台上收到以下错误（大约1.5k至2.5k模拟用户）

OpenJDK 64-Bit Server VM warning: Attempt to protect stack guard pages failed.
OpenJDK 64-Bit Server VM warning: Attempt to deallocate stack guard pages failed.
OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00007f20ee653000, 12288, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 12288 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /jmetertests/jm/bin/hs_err_pid1833.log
OpenJDK 64-Bit Server VM warning: Attempt to deallocate stack guard pages failed.
OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00007f2218de8000, 12288, 0) failed; error='Cannot allocate memory' (errno=12)

提到的错误报告文件如下所示

# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 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:2798), pid=1833, tid=140472285792000
#
# JRE version: OpenJDK Runtime Environment (7.0_75-b13) (build 1.7.0_75-b13)
# Java VM: OpenJDK 64-Bit Server VM (24.75-b04 mixed mode linux-amd64 )
# Derivative: IcedTea 2.5.4
# Distribution: Ubuntu 14.04 LTS, package 7u75-2.5.4-1~trusty1
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again

我试图通过在.sh文件中发出java命令之前添加以下行来修改jmeter.sh来分配更多内存：

JVM_ARGS="-Xms5g -Xmx20g -Xss300k"

我也尝试_JAVA_OPTIONS使用以下命令设置环境变量

export _JAVA_OPTIONS="-Xms5g -Xmx20g"

最后我在一些SO线程中找到了此命令

sysctl -w vm.max_map_count=500000

该top-Command使我对内存的下列信息

KiB Mem:  61836576 total, 15163400 used, 46673176 free,    10636 buffers
KiB Swap:        0 total,        0 used,        0 free.    94492 cached Mem

更新

仅供参考：除简单的数据编写器外，我在JMeter中不使用任何侦听器。但是，即使我禁用了最后一个侦听器，也会引发错误。

java -Xms40g -version

是成功的-所以我真的可以分配这么多的内存

我通过使用减小了堆栈大小

-Xss300k

当我现在得到一个

Uncaught Exception java.lang.OutOfMemoryError:
unable to create new native thread. See log file for details.

错误。看来系统上的线程数已用完？

更新2

根据某些用户的要求，结果uf ulimit -a

core file size          (blocks, -c) 0
scheduling priority             (-e) 0
pending signals                 (-i) 491456
max locked memory       (kbytes, -l) 64
open files                      (-n) 500000
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
max user processes              (-u) 491456
... all other entries are set to 'unlimited'

并且limits.conf包含以下条目

*         hard    nofile      900000
*         soft    nofile      900000
root      hard    nofile      900000
root      soft    nofile      900000

另外，我已将threads-maxunder
设置为proc/sys/kernel高得离谱，并且还增加了proc/sys/vm/max_map_count

我错过了什么还是做错了什么？谢谢您的帮助。

*         hard    nofile      900000
*         soft    nofile      900000
root      hard    nofile      900000
root      soft    nofile      900000

kernel.pid_max=999999
kernel.thread-max=999999
vm.max_map_count=999999
fs.file-max=999999

JVM_ARGS="-Xmx15g -Xss250k"