Package org.jboss.test.clusterbench.web.load

Class MemoryUsageServlet

java.lang.Object
jakarta.servlet.GenericServlet
jakarta.servlet.http.HttpServlet
org.jboss.test.clusterbench.web.load.MemoryUsageServlet
All Implemented Interfaces:
jakarta.servlet.Servlet, jakarta.servlet.ServletConfig, Serializable
@WebServlet(name="MemoryUsageServlet", urlPatterns="/memoryusage") public class MemoryUsageServlet extends jakarta.servlet.http.HttpServlet
MemoryUsageStress
Author:
Michal Babacek

This simple servlet is used for stressing memory.

The objective is to force JVM to allocate a given amount of memory (in megabytes). After the memory is filled up, we wait for a specified number of milliseconds before dereferencing.

E.g.:

http://localhost:8080/clusterbench/memoryusage?milliseconds=20000&megabytes=500

will allocate 500MB and keep them for 20000ms.

Warning: Obviously, if you set megabytes=1000 while having -Xmx512m you will experience an unpleasant and utterly inevitable OOM.

Note: Naturally, if -Xms < -Xmx, JVM will be allocating more system physical memory. You can observe system physical memory values in the message you shall get from this servlet.

See Also:

  • Field Summary

    Fields inherited from class jakarta.servlet.http.HttpServlet

    LEGACY_DO_HEAD

  • Constructor Summary

    Constructors
    Constructor
    Description
    MemoryUsageServlet()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    protected void
    doGet(jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response)
     
    String
    getServletInfo()
     

    Methods inherited from class jakarta.servlet.http.HttpServlet

    doDelete, doHead, doOptions, doPost, doPut, doTrace, getLastModified, init, service, service

    Methods inherited from class jakarta.servlet.GenericServlet

    destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletName, init, log, log

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • MemoryUsageServlet

      public MemoryUsageServlet()

  • Method Details

    • doGet

      protected void doGet(jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response) throws jakarta.servlet.ServletException, IOException
      Overrides:
      doGet in class jakarta.servlet.http.HttpServlet
      Throws:
      jakarta.servlet.ServletException
      IOException

    • getServletInfo

      public String getServletInfo()
      Specified by:
      getServletInfo in interface jakarta.servlet.Servlet
      Overrides:
      getServletInfo in class jakarta.servlet.GenericServlet