centos6.0非root用户JRE报资源不可用错误

用非root用户启动某监控程序，报了如下错误：

There is insufficient memory for the Java Runtime Environment to continue.

# Native memory allocation (malloc) failed to allocate 549232 bytes for Chunk::new
# An error report file with more information is saved as:
# /opt/smc/hs_err_pid6659.log
#
# There is insufficient memory for the Java Runtime Environment to continue.
# pthread_getattr_np
# An error report file with more information is saved as:
# /opt/smc/hs_err_pid7631.log
OpenJDK 64-Bit Server VM warning: Attempt to allocate stack guard pages failed.
#
# There is insufficient memory for the Java Runtime Environment to continue.
# pthread_getattr_np
# An error report file with more information is saved as:
# /opt/smc/eventmonitor/sbin/hs_err_pid8109.log
#
# There is insufficient memory for the Java Runtime Environment to continue.
# pthread_getattr_np
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 40 bytes for symbol
# An error report file with more information is saved as:

# /opt/smc/hs_err_pid10567.log

运行java -version也报错：

Error occurred during initialization of VM
Could not reserve enough space for object heap
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

修改配置

/etc/security/limits.d目录下90-nproc.config，centos6.0的max user processes只有1024，而centos5.0的是278528，具体为什么这么做，不得而知。

90-nproc.config：

# Default limit for number of user's processes to prevent
# accidental fork bombs.
# See rhbz #432903 for reasoning.
*          soft    nproc     278528
root       soft    nproc     unlimited

注释掉*  soft  nproc 1024或者修改1024为老版本的278528。

如果还不行，查看：/proc/sys/vm/overcommit_memory文件：

缺省设置：0（只读）

该文件指定了内核针对内存分配的策略，其值可以是0、1、2。

0， 表示内核将检查是否有足够的可用内存供应用进程使用；如果有足够的可用内存，内存申请允许；否则，内存申请失败，并把错误返回给应用进程。

1， 表示内核允许分配所有的物理内存，而不管当前的内存状态如何。

2， 表示内核允许分配超过所有物理内存和交换空间总和的内存（参照overcommit_ratio）。

如果此文件的值不为0，则修改为0。

结束，success！