Hi Chris,
> -----Original Message-----
> From: Christopher Schultz [mailto:ch...@christopherschultz.net]
> Sent: Monday, September 30, 2013 5:19 PM
> To: Tomcat Developers List
> Subject: Re: Possible IIS SPDY Redirector for Tomcat
>
> Konstantin,
>
> On 9/28/13 1:40 PM, Konstantin Preißer wrote:
> > Contra:
> > - Worse performance than the native ISAPI redirector. I made a test by a
> Servlet that produces 700 MB of random data, and on a separate machine I
> used a program to make a HTTP request and read the data. The average
> transfer speed was ~ 98 MByte/s, and the IIS worker process had around
> 50% CPU usage, whereas Jetty had only 12 %.
>
> How good of a C# programmer are you? Perhaps you could have someone
> else
> look at it to make sure you aren't doing something that has obvious
> performance drawbacks (e.g. using an un-buffered stream often results in
> a kernel call for each byte of data to be transferred).
Thanks for your reply. Yes, that redirector is only a draft and could have some
performance issues.
However, I have done a Test with IIS 8.0 and a simple ASP.Net Handler (.ashx)
that just writes ~625 MB of random data by writing a 327680 bytes array 2000
times to the response:
public class Handler1 : IHttpHandler {
public void ProcessRequest(HttpContext context) {
HttpResponse response = context.Response;
response.ContentType = "text/plain";
response.AddHeader("Content-Disposition", "attachment;
filename=abc.txt");
byte[] bytes = new byte[327680];
for (int i = 0; i < bytes.Length; i++) {
bytes[i] = (byte)((i * 12345 + 98237) % 255);
}
using (Stream sout = response.OutputStream) {
for (int i = 0; i < 2000; i++) {
sout.Write(bytes, 0, bytes.Length);
response.Flush();
}
}
}
public bool IsReusable {
get { return true; }
}
}
And I still get ~ 50% CPU usage by the IIS worker process (w3wp.exe) while the
transfer speed is about 100 MByte/s.
So it seems that the main performance problem is IIS when using managed
code/ASP.Net to write to the response, but I need to do additional testing.
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