This servlet reproduces the problem perfectly.
package axioma.rubik.engine.web.servlet;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import axioma.rubik.engine.web.ComunicationChannelHttp;
import it.axioma.rubik.engine.Cronometro;
@WebServlet(name="Test8", description="Direct update of data",
urlPatterns={"/Test8"})
public class Test8Servlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
this.doGet(request,response);
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
try {
fai(response);
System.gc();
} catch (Exception ex) {
ex.printStackTrace();
}
ComunicationChannelHttp.CONTEXT_MANAGER.clean();
}
public void fai(HttpServletResponse response) {
Cronometro crono = new Cronometro();
ByteArrayOutputStream bbs = new ByteArrayOutputStream();
BufferedOutputStream bos = new BufferedOutputStream(bbs);
try {
for(int i = 0; i < 400000; i++) {
bos.write(96);
}
bos.flush();
System.out.println("Step 1 : "+crono.elapsed());
bbs.writeTo(response.getOutputStream());
System.out.println("Step 1 : "+crono.elapsed());
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
> Subject: Re: Performance regression from 7 to 8
> To: users@tomcat.apache.org
> From: ma...@apache.org
> Date: Fri, 4 Mar 2016 10:38:30 +0000
>
> On 04/03/2016 10:24, Tullio Bettinazzi wrote:
> > The problem is all in this small piece of code
> > ByteArrayOutputStream bbs = new ByteArrayOutputStream();
> > BufferedOutputStream bos = new BufferedOutputStream(bbs);
> > trans.eseguiTrasformazioneOut(bos);
> > try {
> > bos.flush();
> > initReponse(xpFileTypeOut.getMimeType(), xpFilename);
> > bbs.writeTo(getOutputStream());
> > } catch (IOException ex) {
> > Messaggi.getErrori().getLogger().error("Errore in emettiFile ",
> > ex);
> > }
> > The yellow instruction take 100 ms in Tomcat7, quite stable on all clients,
> > in Tomcat8 it takes from 50 ms to 4500 ms stable on a single client PC but
> > very different from client to client.
> > Tks
> > Tullio
>
> I'll repeat what I said previously:
>
> Try creating the *simplest possible* web application that demonstrates the
> problem.
>
> Mark
>
> >
> >> Subject: Re: Performance regression from 7 to 8
> >> To: users@tomcat.apache.org
> >> From: ma...@apache.org
> >> Date: Fri, 4 Mar 2016 09:42:22 +0000
> >>
> >> On 04/03/2016 09:39, Tullio Bettinazzi wrote:
> >>> I applied tour suggestion and analyzed, with firebug, the composition of
> >>> the time.
> >>> The difference between 7 and 8 is the "receiving" time which is more or
> >>> less zero in 7 and 2sec. in 8.
> >>> How can I understand such difference ?
> >>
> >> Try creating the simplest possible web application that demonstrates the
> >> problem.
> >>
> >> Mark
> >>
> >>
> >>> Tks
> >>> Tullio
> >>>
> >>>
> >>> P.S. : same server, same client, same network, same code both 7 and 8
> >>> installed from scratch
> >>>
> >>>> Subject: Re: Performance regression from 7 to 8
> >>>> To: users@tomcat.apache.org
> >>>> From: geor...@mhsoftware.com
> >>>> Date: Thu, 3 Mar 2016 09:30:33 -0700
> >>>>
> >>>>
> >>>>
> >>>> On 3/3/2016 4:06 AM, Tullio Bettinazzi wrote:
> >>>>> I've an application in which I write a page from a Buffered Stream
> >>>>> directly to the Servlet output stream (more or less 300kb).
> >>>>>
> >>>>> In 7 it works perfectly (100ms).
> >>>>>
> >>>>> In 8 , depending from the network connection and mainly from the
> >>>>> http client itself (the browser in the PC) the same operation takes from
> >>>>> 50ms to 4500 ms.
> >>>>
> >>>> One of the things I would look at is the browser debug window. Open the
> >>>> debugger, and go to the Networks/Timings tab and load both pages. That
> >>>> would give some insights as to what's happening. Perhaps it is the page.
> >>>> Perhaps there's something else.
> >>>>
> >>>>>
> >>>>> On the same PC I find more or less the same time using Chrome and
> >>>>> Firefox also changing network connections (wifi, lan, adsl).
> >>>>>
> >>>>> Could someone suggest a solution ?
> >>>>>
> >>>>> Tks
> >>>>> Tullio
> >>>>>
> >>>>
> >>>> --
> >>>> George Sexton
> >>>> *MH Software, Inc.*
> >>>> Voice: 303 438 9585
> >>>> http://www.connectdaily.com
> >>>
> >>>
> >>
> >>
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> >>
> >
> >
>
>
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