tomcat 7内存调大也起不来

类似

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "Timer-0"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "Timer-1"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "startQuertz_QuartzSchedulerThread"

错误，或者

 SEVERE:Memory usage is low, parachute is non existent, your system may start failing.

Exception in thread "http-nio-81-exec-3" Exception in thread "ExpiresCacheCleaner Thread" Exception in thread "com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1" SEVERE:Memory usage is low, parachute is non existent, your system may start failing.

Exception in thread "http-nio-81-exec-1" SEVERE:Memory usage is low, parachute is non existent, your system may start failing.

Exception in thread "http-nio-81-exec-7" SEVERE:Memory usage is low, parachute is non existent, your system may start failing.

Exception in thread "http-nio-81-exec-5"  

启动起不起来，或者起来了，一下就挂了。

可能是tomcat 内存调整了，但是jvm内存没调。只是怀疑哈。

个人这么处理的。加上环境变量 JAVA_TOOL_OPTIONS  -Xmx1536m -XX:MaxPermSize=2048m -Xms1024m 。貌似就可以了。

或者尝试在注册表中options中追加 -XX:PermSize=512M

-XX:MaxPermSize=640m

-Xms800m

-Xmx800m

对应的配置也可以。

正式环境：

linux cataxxx.sh 加上

 JAVA_OPTS="-Xms400m -Xmx400m  -Xss512K -XX:PermSize=128m -XX:MaxPermSize=256m" 

The 

JAVA_TOOL_OPTIONS

 Environment Variable

In many environments the command line is not readily accessible to start the application with necessary command-line options. This often arises with applications that use embedded VMs (meaning they use the Java
Native Interface (JNI) Invocation API to start the VM), or where the startup is deeply nested in scripts. In these environments the 

JAVA_TOOL_OPTIONS

 environment
variable can be useful to augment a command line.
When this environment variable is set, the 

JNI_CreateJavaVM

 function (in the JNI Invocation API) prepends the
value of the environment variable to the options supplied in its 

JavaVMInitArgs

 argument.

Note: In some cases this option is disabled for security reasons (for example, on Oracle Solaris operating system this option is disabled when the effective user or group ID differs from the real ID).

This environment variable allows you to specify the initialization of tools, specifically the launching of native or Java programming language agents using the 

-agentlib

 or 

-javaagent

 options.
In the following example the environment variable is set so that the HPROF profiler is launched when the application is started:

$ export JAVA_TOOL_OPTIONS="-agentlib:hprof"

This variable can also be used to augment the command line with other options for diagnostic purposes. For example, you can supply the 

-XX:OnError

 option
to specify a script or command to be executed when a fatal error occurs.
Since this environment variable is examined at the time the 

JNI_CreateJavaVM

 function is called, it cannot be
used to augment the command line with options that would normally be handled by the launcher, for example, VM selection using the 

-client

 option or the 

-server

 option.

For more information on 

JAVA_TOOL_OPTIONS

 environment variable, see Java tool options from JVM
Tool Interface documentation.
http://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/envvars002.html