Jvm Tomcat上的内存不足

我正在使用Tomcat7使用spring控制器部署我的应用程序，我在服务器上有时会看到以下异常。请帮忙。请务必理解，这与我的服务器内存有关，但可能是我的错误。最后，我还将给出我的ulimit详细信息。这只会偶尔发生，并不总是这样。没有特定的重复场景或发生间隔

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我使用的是Red Hat 6 64位操作系统 设置的JVM规范是：-Xms1024m-Xmx1024M-XX:PermSize=64M-XX:MaxPermSize=512m

27 Dec 2013 10:56:15,462 DEBUG [http-bio-5004-exec-41] DispatcherServlet:910 - Could  not complete request
org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.OutOfMemoryError: unable to create new native thread
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:972)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.atmosphere.util.AtmosphereFilterChain.doFilter(AtmosphereFilterChain.java:171)
    at org.atmosphere.util.AtmosphereFilterChain.invokeFilterChain(AtmosphereFilterChain.java:132)
    at org.atmosphere.handler.ReflectorServletProcessor$FilterChainServletWrapper.service(ReflectorServletProcessor.java:359)
    at org.atmosphere.handler.ReflectorServletProcessor.onRequest(ReflectorServletProcessor.java:204)
    at org.atmosphere.cpr.AsynchronousProcessor.action(AsynchronousProcessor.java:237)
    at org.atmosphere.cpr.AsynchronousProcessor.suspended(AsynchronousProcessor.java:163)
    at org.atmosphere.container.Servlet30CometSupport.service(Servlet30CometSupport.java:101)
    at org.atmosphere.container.Tomcat7Servlet30SupportWithWebSocket.doService(Tomcat7Servlet30SupportWithWebSocket.java:67)
    at org.atmosphere.container.TomcatWebSocketUtil.doService(TomcatWebSocketUtil.java:95)
    at org.atmosphere.container.Tomcat7Servlet30SupportWithWebSocket.service(Tomcat7Servlet30SupportWithWebSocket.java:62)
    at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:1675)
.......

Caused by: java.lang.OutOfMemoryError: unable to create new native thread
    at java.lang.Thread.start0(Native Method)
    at java.lang.Thread.start(Thread.java:691)
    at sun.net.www.http.KeepAliveCache$1.run(KeepAliveCache.java:112)
    at sun.net.www.http.KeepAliveCache$1.run(KeepAliveCache.java:96)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.net.www.http.KeepAliveCache.put(KeepAliveCache.java:95)
    at sun.net.www.http.HttpClient.putInKeepAliveCache(HttpClient.java:353)
    at sun.net.www.http.HttpClient.finished(HttpClient.java:341)
    at sun.net.www.http.KeepAliveStream.close(KeepAliveStream.java:100)
    at sun.net.www.MeteredStream.justRead(MeteredStream.java:93)
    at sun.net.www.MeteredStream.read(MeteredStream.java:135)
    at java.io.FilterInputStream.read(FilterInputStream.java:133)
    at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3052)
    at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3046)
    at org.springframework.util.FileCopyUtils.copy(FileCopyUtils.java:112)
    at org.springframework.util.FileCopyUtils.copyToByteArray(FileCopyUtils.java:164)
    at org.springframework.web.client.DefaultResponseErrorHandler.getResponseBody(DefaultResponseErrorHandler.java:102)
    at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:87)
    at org.springframework.web.client.RestTemplate.handleResponseError(RestTemplate.java:494)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:451)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:409)
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:385)
    at com.payoda.appviewx.web.adapter.rest.AdapterBase.sendRequest(AdapterBase.java:90)
    at com.payoda.appviewx.web.adapter.rest.DiscoverDeviceAdapter.discoverDeviceByRange(DiscoverDeviceAdapter.java:63)
    at com.payoda.appviewx.web.controller.DeviceController.getDiscoverDeviceUsingRange(DeviceController.java:137)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
    ... 71 more

ulimit的详情如下

Ulimit details
----------------
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 127515
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 20000
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 65536
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

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在$CATALINA_HOME/bin中创建文件setenv.sh setenv.bat，将以下内容放入其中：

set CATALINA_OPTS="-Xms512m -Xmx1024m"

然后重新启动tomcat

如果无法解决问题，请尝试将参数Xms和Xmx更改为更高的值

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重要提示：如果您在Linux上，不要忘记将可执行位设置为setenv.sh。

它与ulimit无关；JVM施加了自己的最大内存限制。例如，当从命令行启动java时，您将使用-Xmx10g作为JVM的10Gb最大内存。对于Tomcat，设置的位置取决于您拥有的操作系统以及如何安装Tomcat

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例如，在使用Debian包中的Tomcat的Debian上，您通常会编辑/etc/default/Tomcat。。。把JAVA_OPTS=-Xmx10g放进去，或者你想放多少就放多少。

JVM堆已经耗尽了。我使用的是Red Hat 6 64位操作系统，设置的JVM规范是：-Xms1024m-Xmx1024M-XX:PermSize=64M-XX:MaxPermSize=512m我正在使用Red Hat 6 64位操作系统，设置的JVM规范是：-Xms1024m-Xmx1024M-XX:PermSize=64M-XX:MaxPermSize=512m。我可能会尝试将Xms增加到1024，将Xmx增加到1240。。这应该是一个好数字吗？我拙劣的建议：首先尝试最大值。最大值的定义如下：如果您进一步增加它，tomcat将根本不会启动。如果最大值解决了问题，则减小该值，直到错误再次再现。请让我知道您提到的最大值。你的意思是从xms开始，xms为1240，然后尝试逐步降低xms的值吗？例如：如果我的计算机安装了8GB的操作内存，我会尝试-xmx700m，假设操作系统和其他一些应用程序使用1GB。如果tomcat不是从7000开始的，那么将其减少到6000，等等。好的，知道了。。但我有一个问题。首先，我不能扩展到1.2GB以上，因为我有其他应用程序在同一个盒子上运行ActiveMQ、Karaf、MongoDB等，这取决于8GB ram。其次，我的xmx和xmas1024正确地启动了我的tomcat，甚至可以正常工作。只有在4-5天之后，有时我才会遇到outofmemory这个问题。。