java - php(网络服务器)调用java不工作

Question

问题

• 在php(Web服务器)中调用java时，出现内存不足错误。

状态

• 网络服务器 - centos 6、nginx、php-fpm、java
• 在centos中调用java - 成功
• 在 php 中调用 java - 发生内存不足错误

调用API

• 案例:php

$string = exec('java -Xms2g -Xmx2g -jar /usr/share/nginx/html/my_test.jar /mytmp/testfile’, $output, $code);

• 案例:centos 6(linux)

java -Xms2g -Xmx2g -jar /usr/share/nginx/html/my_test.jar /mytmp/testfile

错误消息

# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 2555904 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:2673), pid=2549, tid=140226036020992
#
# JRE version:  (8.0_45-b14) (build )
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.45-b02 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
#

问题

• 为什么工作不同？
• 如何解决这个问题？

我尝试了(未解决)

• 设置内存

java -Xms2g -Xmx2g 

Answer 1

我解决了这个问题。
“setsebool -P httpd_execmem 上”