Linux下TomcatVM参数修改

时间:2021-10-15 13:33:21

作者:admin

来源:纯净之家


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不可行的方法
 
最初我直接修改catalina.sh, 将JAVA_OPTS变量加上了
 
-server -Xms1G -Xmx1G -XX:+UserG1GC
最初看起来没啥问题,但是当服务器运行几天后,发现执行shutdown.sh无法关闭tomcat, 错误信息如下:
 
# root@iZ94hjppdqzZ:~/projects/taolijie# cat hs_err_pid5519.log 
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 1073741824 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=5519, tid=3061726064
#
# JRE version:  (8.0_45-b14) (build )
# Java VM: Java HotSpot(TM) Server VM (25.45-b02 mixed mode linux-x86 )
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
关闭个tomcat要请求1G的内存, 当时服务器就剩下200M内存,所以Out Of Memory了。查看shutdown.sh,发现它其实还是调用了catalina.sh,只是传入了一个stop参数。而catalina.sh是执行了
 
org.apache.catalina.startup.Bootstrap stop
来向tomcat发送关闭信息的。由于上面我们设置了JAVA_OPTS使用1G的堆,因此执行该类时JVM会向系统申请1G多的内存,直接导致Out Of Memory。
 
可行的方法
 
在catalina.sh的第二行添加:
 
CATALINA_OPTS="$CATALINA_OPTS -server -Xms1G -Xmx1G -XX:+UseG1GC"
这些VM参数就会只应用到catalina而不是所有Tomcat进程。 
 
 
  
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