As a rule, intelligently buffered I/O is far faster than raw I/O. I'd guess
that you're seeing this kind of slowdown.
If you want to know why _your_ code is slow, run it in a profiler and work
from there.
> From: "Dino Fancellu" <[EMAIL PROTECTED]>
> Reply-To: "Java Apache Mail Server" <[EMAIL PROTECTED]>
> Date: Fri, 28 Apr 2000 17:01:42 +0100
> To: "Java Apache Mail Server" <[EMAIL PROTECTED]>
> Subject: Is javax.mail fast enough to handle large volumes of incoming mail?
>
> I ask as I was using javax.mail to handle file upload on a browser(?!) amd
> although it worked, ot was VERY slow.
>
> Using code like this, inside a doPost():
>
> Properties props = System.getProperties();
> Session session = Session.getDefaultInstance(props, null);
>
> // Dummy up a message header.
> String headers
> = "Content-Type: " + request.getContentType() +
> "\r\n\r\n";
>
> InputStream messageIS =
> new SequenceInputStream(new StringBufferInputStream(headers),
> request.getInputStream());
> System.out.println("Processing "+new java.util.Date().toString());
> try
> {
> MimeMessage message = new MimeMessage(session, messageIS);
> System.out.println("Got MimeMessage");
> Object content = message.getContent();
> if (content instanceof MimeMultipart)
> {
> MimeMultipart mm = (MimeMultipart) content;
> System.out.println("Its multipart");
> int nBodyParts = mm.getCount();
> for (int i = 0; i < nBodyParts; i++)
> {
> BodyPart part = mm.getBodyPart(i);
> System.out.println("Filename="+part.getFileName());
> }
>
> processRequest(request, response);
> }
> }
> catch (MessagingException ex)
> {
>
> }
> System.out.println("End "+new java.util.Date().toString());
>
>
> On my Athlon850, not a slow machine, with JDK1.3, uploaded a 1.5 meg file in
> 5 minutes!!!!
>
> Using hand cranked code to parse the incoming stream takes 40 seconds.
>
> What gives?
>
> The submitted jsp was like this:
>
> <html>
> <head><title>File upload</title></head>
> <body>
> <%! int count=0; %>
> <%
> System.out.println(count);
> count++;
> %>
> Please upload your pension data here<BR>
>
> <FORM ACTION="/servlet/com.javelin.swinglets.demo.FileUploadServlet2"
> METHOD=POST ENCTYPE="multipart/form-data" >
> What is your name? <INPUT TYPE=TEXT NAME=submitter> <BR>
> Which file to upload? <INPUT TYPE=FILE NAME=file> <BR>
> <INPUT TYPE=SUBMIT>
> </FORM>
>
> <FORM ACTION="/servlet/com.javelin.swinglets.demo.FileUploadServlet"
> METHOD=POST ENCTYPE="multipart/form-data">
> Which special file to upload? <INPUT TYPE=FILE NAME=file2> <BR>
> <INPUT TYPE=SUBMIT>
>
> </FORM>
>
>
> </body>
> </html>
>
> The first version went to the javax.mail uploaded, the second to my hand
> cranked uploaded. The biggest hit was turning the
> input stream into a mime message, 5 minutes.
>
> I was thinking, perhaps javax.mail is ok for sending, and for receiving
> personal emails, but not up to the job for handling large volumes?
> Has anyone looked at the code for creating a mime message from a stream?
> Seems odd that its 7.5 times slower than my own code,
> which I thought was pretty damn slow before I tried the javax.mail method.
>
> Dino.
>
>
>
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