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WHEN YOU POST, include all relevant version numbers, log files,
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You can try VeloMeter (pure Java stress tester). I can send you my script
if you'd like, but it's a bit of a hack, and I'm almost ashamed to post it
in its current state :>
VeloMeter's not my favorite piece of software, but it'll demonstrate the
problem (check out http://www.binaryevolution.com/velometer/velometer.vet)
Thanks,
Ben
>Ben,
> Can you also include the script you are using for the stress testing ?
>I can try and run it on my machine and see what turns up.
>
>best regards
>
>Raghu
>
>From:"B. Flaumenhaft" <[EMAIL PROTECTED]> on 01/18/2000 07:37 PM GMT
>
>Sent by: "B. Flaumenhaft" <[EMAIL PROTECTED]>
>
>Please respond to "Java Apache Users"
><[EMAIL PROTECTED]>
>
>
>To: "Java Apache Users" <[EMAIL PROTECTED]>
>cc: (bcc: Raghu V Singh/rsingh1/LSU)
>
>Subject: Re: Apache/JServ under high-volume requests?
>
>
>
>----------------------------------------------------------------
>BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
>WHEN YOU POST, include all relevant version numbers, log files,
>and configuration files. Don't make us guess your problem!!!
>----------------------------------------------------------------
>
>
>Thanks for all the suggestions, but I'm afraid I've managed to duplicate
>the problem with an extremely basic servlet (no database access or
>potential resource issues).
>
>I took the SimpleServlet program, included as an example in the JSDK. This
>servlet simply opens an output stream and prints a "hello world"; I added a
>small delay to it (Thread.sleep() for ten seconds). Several hundred
>connections kills Apache/JServ quite effectively.
>
>I've attached this servlet code to the end of this message, in case anyone
>would like to try it for themselves.
>
>It certainly occurred to me that there might be bugs in my code (or in my
>VM). Still, to reiterate what noone has responded to: *** I'm not seeing
>deadlock, and I'm not seeing exceptions. I'm seeing JServ restart itself
>and Apache return internal server errors while this is happening. ***
>
>Under what conditions should JServ die and restart? I was under the
>impression that it shouldn't be possible for my code to kill the VM.
>
>I have a number of ideas as to what's happening here (most of them
>involving APJserv issues), but they're pure speculation, and I don't know
>the JServ internals very well. That's why I'm posting this here.
>
>To reiterate: a very vanilla servlet is killing Apache/JServ under
>high-load conditions, and this is perfectly duplicable under Linux and
>Solaris (using several VMs, including the JavaSoft VM).
>
>Thoughts?
>
>Thanks,
>Ben Flaumenhaft
>
>
>
>here's the code that's causing problems when requested by one or two
>hundred concurrent threads:
>
>import java.io.*;
>import javax.servlet.*;
>import javax.servlet.http.*;
>
>public class SimpleServlet extends HttpServlet
>{
> public void doGet ( HttpServletRequest request,
>HttpServletResponse response )
> throws ServletException, IOException
> {
> PrintWriter out;
> String title = "Simple Servlet Output";
>
> // set content type and other response header fields first
> response.setContentType("text/html");
>
> // then write the data of the response
> out = response.getWriter();
>
> out.println("<HTML><HEAD><TITLE>");
> out.println(title);
> out.println("</TITLE></HEAD><BODY>");
> out.println("<H1>" + title + "</H1>");
> out.println( "<p> Delaying 10 seconds ..." );
> out.flush();
>
> try
> {
> Thread.sleep( 10 * 1000 );
> out.println( "done" );
> }
> catch( InterruptedException e )
> {
> out.println( "interrupted" );
> }
>
> out.println("<P>This is output from SimpleServlet.");
> out.println("</BODY></HTML>");
> out.close();
> }
>}
>
>
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